EP3221880B1 - Circuit breaker comprising a passively heated bimetal element acting on a magnetic yoke of an electromagnetic tripping device - Google Patents
Circuit breaker comprising a passively heated bimetal element acting on a magnetic yoke of an electromagnetic tripping device Download PDFInfo
- Publication number
- EP3221880B1 EP3221880B1 EP15798409.7A EP15798409A EP3221880B1 EP 3221880 B1 EP3221880 B1 EP 3221880B1 EP 15798409 A EP15798409 A EP 15798409A EP 3221880 B1 EP3221880 B1 EP 3221880B1
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- EP
- European Patent Office
- Prior art keywords
- circuit breaker
- bimetallic element
- bimetal element
- electromagnetic release
- temperature
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00Ā -Ā H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
- H01H71/402—Combined electrothermal and electromagnetic mechanisms in which the thermal mechanism influences the magnetic circuit of the electromagnetic mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00Ā -Ā H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00Ā -Ā H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2463—Electromagnetic mechanisms with plunger type armatures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00Ā -Ā H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00Ā -Ā H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
- H01H2071/407—Combined electrothermal and electromagnetic mechanisms the thermal element being heated by the coil of the electromagnetic mechanism
Definitions
- the invention relates to a circuit breaker, comprising at least two terminal contacts, which are electrically connected within the circuit breaker via a switching contact, an acting on the switching contact electromagnetic release whose coil is connected between the at least two terminal contacts, and acting on the switching contact bimetallic actuator respectively a bimetallic element acting on the switching contact.
- Circuit breakers are used to protect a line against excessive current load. If a predetermined limit is exceeded, the switching contact located between the terminals is opened and thus the circuit is interrupted.
- the tripping in conventional circuit breakers can usually be done electromagnetically, by means of a bimetallic element, manually and in many cases also via an external connection.
- the electromagnetic release is aimed primarily at the disconnection of the circuit at high overcurrent. Since the coil of the electromagnetic release of the circuit breaker is traversed by the current flowing through the terminals, the force generated by the electromagnetic release is dependent on the current. Above a certain threshold, the switching contact is opened by this force. The electromagnetic release responds very quickly, whereby the delay time between the occurrence of an overcurrent and the opening of the switch contact is only very short.
- the triggering via the bimetallic element takes place much slower and is intended above all to prevent excessively long-lasting current, which is only slightly above a set limit.
- the bimetallic element is connected for this purpose in the electrical connection between the terminals of the circuit breaker and is therefore flowed through by the current flowing through the terminal contacts current.
- the bimetallic element is gradually heated according to its electrical resistance and switches off after a delay time, which depends on the magnitude of the current. A higher overcurrent leads to an earlier shutdown, a lower current to a later shutdown.
- the electromagnetic release or the bimetal element can act directly or indirectly on the switching contact.
- the electromagnetic release / the bimetallic element may in particular act on a lever system connected to the switching contact.
- a circuit breaker of the aforementioned type in which the electrical connection between the at least two connection contacts is guided past the bimetallic element and the bimetallic element is thermally coupled to said electromagnetic trigger.
- the bimetallic element acts directly on the switching contact, ie heating of the bimtal element causes the bimetallic element presses on an element of the switching contact, so that it is opened.
- two acting directly on the switching contact triggering mechanisms namely an electromagnetic and a thermal release are provided.
- An object of the invention is now, from the WO 2014/083191 A1 known circuit breaker to improve.
- a current load of the bimetal element is to be reduced or avoided and / or the power loss on the circuit breaker power loss can be reduced and / or the structure of a circuit breaker can be simplified.
- the bimetallic element is passively heated, that is, heated only by the waste heat of the electromagnetic release.
- the power loss at the circuit breaker can also be reduced.
- the thermal and electromagnetic short-circuit release are combined spatially and functionally, ie they can form an assembly. This simplifies the construction of a circuit breaker.
- the disclosed arrangement is particularly suitable for use in existing systems.
- the switch contact or the lever system do not need to be changed, since the bimetallic element acts indirectly via the one iron circuit or iron yoke of the electromagnetic release on the switching contact / the lever system. From the perspective of the switch contact / lever system, nothing changes with the use of such a trigger mechanism.
- the working temperature ie the temperature at which the curvature of the bimetallic element is so large that the switching contact is opened comparatively high (eg above 100 Ā° C).
- the bimetallic element should have sufficient working capacity for the triggering have the triggering mechanism of the circuit breaker. That is, the product of travel and force at the free end of the bimetallic element should be sufficiently large. This requires a sufficient distance from the working temperature to the reference temperature (eg 20 Ā° C).
- the heating power of said electromagnetic release is sufficient in most cases to heat the bimetallic element and to ensure safe triggering of the circuit breaker by the bimetallic element.
- coils for large rated currents have a low number of turns with a large conductor cross section
- coils for small rated currents have a comparatively large number of turns with a small conductor cross section.
- the bimetallic element is arranged at a distance from the electromagnetic release, in particular at a distance from the coil. Thereby, a good electrical insulation between the electromagnetic release, in particular its coil, and the bimetallic element can be achieved. A short circuit of the coil by the bimetallic element is thus avoided even if the insulation of the coil should be defective for some reason.
- the bimetallic element and the electromagnetic release, in particular its coil are arranged directly adjacent in the circuit breaker.
- the bimetallic element can be well heated by thermal radiation.
- "Directly adjacent" in this context means that between the electromagnetic triggers, in particular its coil, and the bimetallic element in the relevant for the heat transfer by radiation zone no significant shielding by other components.
- at least 90% of the radiation emitted by the electromagnetic release, in particular its coil, in this zone rays should impinge unhindered on the bimetallic element. That is 90% of those rays, which emanate from the electromagnetic release and due to the spatial position of the electromagnetic release and the bimetallic element to each other in principle can hit the bimetallic element.
- the bimetallic element is / are provided with a coating at least in the region of the thermal coupling with the electromagnetic release and / or the electromagnetic release at least in the region of the thermal coupling with the bimetal element, which is at least 90%.
- the infrared radiation absorbs.
- the bimetallic element and / or the electromagnetic release may be coated accordingly for this purpose.
- the absorption capacity in the infrared range is relevant, in the visible wavelength range, the elements mentioned may well have a different color than black.
- the bimetallic element is arranged above the electromagnetic release, in particular above the coil, or a guide device for directing hot air from the electromagnetic release to the bimetal element is provided.
- the bimetallic element can be well heated by convection. Warm air rising from the electromagnetic release sweeps around the bimetallic element and heats it. It is particularly advantageous in this case if a turbulent flow is generated, in particular by the shape of the electromagnetic release, its coil or the guide device.
- the bimetallic element forms at least part of a yoke of the electromagnetic release.
- the bimetallic element can in turn be heated by eddy currents, on the other hand, it forms part of the magnetic yoke of electromagnetic trigger, resulting in a particularly strong synergistic effect.
- This variant of the invention works particularly well when the bimetallic element has a comparatively high iron content. In general, eddy currents at a frequency of 50 Hz contribute only a comparatively small proportion to heating of the bimetallic element.
- the coils are made of different thickness wire and have substantially the same diameter, in particular outer diameter.
- a series of circuit breakers with relatively few different designs of its components can be constructed, since all coils have the same diameter (preferably the same outer diameter) and the components of the circuit breaker fit without major adaptations to each other.
- no different types of components of the circuit breaker need be provided at all.
- the differently thick coil wires are also wound on bobbin tubes with different diameters, so that within the series of circuit breakers result in coils with substantially the same outer diameter.
- circuit breaker results further when the bimetallic element acts directly or indirectly on the impact armature / plunger of the electromagnetic release on the switching contact or an associated lever system. This allows even more influence on the electromagnetic release can be taken.
- the circuit breaker comprises a transverse to the direction of movement of the impact armature / plunger and acting on the impact armature / plunger leaf spring which is fixedly mounted at one end to the electromagnetic release and connected at the other end to the bimetallic element, in particular articulated and / or connected.
- the leaf spring acts on that end of the impact armature / plunger that faces away from the switching contact or the lever system.
- the interface between the impact armature / plunger and the switching contact or the lever system can be kept simple.
- such an arrangement can also be used for existing systems, since the said interface does not need to be changed.
- leaf spring / bimetallic element has forked ends into which a notch in the bimetallic element / in the leaf spring engages.
- a rotary joint between the leaf spring and the bimetallic element can be realized in a simple manner.
- the leaf spring / the plunger has a recess into which engages a notch in the plunger / in the leaf spring.
- bimetallic element bends away when heated by the electromagnetic release.
- a leaf spring results in degressive course of the force acting on the plunger force.
- this results in a progressive course of the distance traveled by the plunger path relative to the path, which is covered by the free end of the bimetal element.
- the bimetallic element bends when heated to the electromagnetic release. This allows the bimetal element to press directly on the plunger of the electromagnetic release. In combination with a leaf spring also results in a progressive course of the force acting on the plunger force. Likewise, this results in a degressive course of the distance traveled by the plunger path relative to the path, which is covered by the free end of the bimetal element.
- a compression spring acts on the impact armature / plunger whose force is directed away from the switching contact or the lever system. As a result, the impact armature / plunger is pulled away from the switching contact or the lever system, regardless of the leaf spring. This variant is particularly advantageous if the leaf spring rests only on the impact armature / plunger but not connected / hooked with this.
- the bimetal element acts indirectly on the iron contact or iron yoke of the electromagnetic release on the switching contact. As a result, repercussions on the bimetal element, where they can arise when the bimetallic element acts on the plunger of the electromagnetic release, can be avoided or at least reduced.
- the at least one bimetallic element is inserted into an iron or iron yoke of the electromagnetic release such that a magnetic flux through the iron / iron yoke in a first position of the at least one bimetallic element at a first temperature smaller is the magnetic flux through the iron circle / iron yoke in a second position of the at least one bimetallic element at a second temperature.
- the magnetic flux in the iron circuit or iron yoke and thus the generated electromagnetic force on a plunger of the electromagnetic release can be influenced.
- the bimetallic influence indirectly influences the switching contact via the electromagnetic release.
- the force that has to apply the bimetallic element very low, since this in the Essentially acts as a switch.
- the bimetallic element can therefore be kept very small.
- the first temperature is less than the second temperature.
- the magnetic flux and thus the force acting on a plunger of the electromagnetic release force at the higher temperature are greater.
- An increase in the current thus always causes an increase of said force, regardless of whether this is done by the current through the coil of the electromagnetic release or by a change of the bimetallic element from the first to the second position due to the increased current.
- the circuit breaker comprises a variable in function of the temperature of the at least one bimetallic element air gap in the iron / iron yoke.
- the magnetic flux in the iron circle / iron yoke of the electromagnetic release can be relatively strongly influenced, since the magnetic resistance formed by the air gap depends linearly on the size of the air gap.
- the at least one bimetallic element is arranged parallel to a direction of movement of a plunger of the electromagnetic release. This results in a particularly compact design of the circuit breaker.
- the circuit breaker has a plastic tube arranged between an inner limb of the iron circuit / iron yoke and the coil of the electromagnetic release.
- the friction between the plastic tube and the inner leg which can be mounted in the plastic tube in particular also displaceable, be kept low.
- the magnetic flux is concentrated on the said inner leg.
- Fig. 1 shows a first example of a triggering mechanism of the WO 2014/083191 A1 known circuit breaker.
- a circuit breaker comprises at least two terminal contacts, which are electrically connected within the circuit breaker via a switching contact 1. Furthermore, the circuit breaker respectively its trigger mechanism comprises a force acting on the switching contact 1 electromagnetic release 2, the coil 3 is connected between the at least two terminals and a switching element acting on the contact 1 bimetallic element 4th
- the electromagnetic release 2 comprises not only the coil 3, a yoke 5 and a in the Fig. 1 not visible because retracted impact anchor respectively ram.
- the bimetallic element 4 is fixed to a bimetallic support 6 and can with a screw 7, which is guided by a nut 8 fixed to the housing, in its position (in the Fig. 1 vertical).
- the bimetallic support 6 is supported on (in Fig. 1 only partially shown) housing 10 of the circuit breaker 1 from, and is thus secured against rotation.
- the switching point or the triggering point of the bimetallic element 4 can be adjusted. Furthermore, the distance of the bimetallic element 4 to the electromagnetic release 2 can be adapted to coils 3 of different sizes. Although differently sized wire cross sections of the coils 3 are required for different current strengths and the coils 3 can also have otherwise different dimensions, thereby circuit breaker for different currents can be constructed substantially the same.
- the switching contact 1 comprises a fixed fixed contact 11 and a movable contact piece 12, which is also part of a lever system 13.
- the switching piece 12 is marked for reasons of clarity with small rings in order to better explain the function of the lever system 13 below.
- the lever system 13 further comprises a contact piece carrier 14, which is rotatably mounted about a housing-fixed axis 15 and is marked with dots.
- the switching piece 12 is rotatably mounted about the arranged on the contact piece carrier 14 axis 16.
- the lever system 13 comprises a pawl 17 which is rotatably mounted about an arranged on the contact piece carrier 14 axis 18 and is also marked with dots.
- the lever system 13 comprises a latch support 19, which is rotatably mounted about the axis 15 and is characterized by small crosses.
- the lever system 13 comprises a torsion spring 20, which presses the pawl 17 and the pawl support 19 against each other, and a tension spring 21, whose force acts on the contact piece 12.
- the bimetallic element 4 In an ON position, the bimetallic element 4 is straight, so that the torsion spring 20 presses the pawl support 19 on the pawl 17 and hooks the pawl 17 with its extension in the pawl support 19.
- the contact piece carrier 14, the pawl 17 and the pawl support 19 can only be moved together, that is, rotated about the housing-fixed axis 15.
- the spring 21 pulls the switching piece 12 in a clockwise direction about the axis 16, whereby the switching contact 1 remains closed in the ON position.
- the tripping of the circuit breaker can be effected by the electromagnetic release 2. If the current is too high, the impact armature presses on the latch support 19, so that the locking between the pawl 17 and the latch support 19 is released. The pawl support 19 and the pawl 17 are then in the in Fig. 1 position shown.
- the tension spring 21 of the contact piece carrier 14 is now rotated about the axis 15 in the counterclockwise direction, wherein the pawl 17 deviates upward and thereby performs a clockwise rotation.
- the arranged on the contact piece carrier 14 axis 16 moves to the right, whereby the switching contact 1 is opened.
- the bimetallic element 4 Due to the arrangement of the bimetallic element 4 in the immediate vicinity of the electromagnetic release 2, the bimetallic element 4 is heated by the waste heat of the electromagnetic release 2.
- the electromagnetic release 2 whose main function is the detection of short-circuit currents and the opening of the switching contact 1 in the event of overcurrent, thus simultaneously acts as a heating coil. This results in a double use of the electromagnetic release 2.
- the Indian Fig. 1 shown trigger mechanism of the circuit breaker has the following additional features:
- the bimetal element 4 is spaced from the electromagnetic release 2, in particular spaced from the coil 3, respectively.
- a good electrical insulation between the electromagnetic release 2, in particular its coil 3, and the bimetallic element 4 can be achieved.
- a short circuit of the coil 3 by the bimetallic element 4 is thus avoided even if the insulation of the coil 4 should be defective for some reason.
- the bimetal element 4 and the electromagnetic release 2, in particular its coil 3, are arranged directly adjacent in the circuit breaker.
- the bimetallic element 4 can be well heated by thermal radiation, because between the electromagnetic actuator 2, in particular its coil 3, and the bimetallic element 4 takes place in the relevant for the heat transfer by radiation zone no significant shielding by other components ,
- the bimetal element 4 is provided with a coating at least in the region of the thermal coupling with the electromagnetic release 2 and / or the electromagnetic release 2, at least in the region of thermal coupling with the bimetallic element 4 / are, which absorbs at least 90% of the infrared radiation. In this way, the heat transfer by radiation from the electromagnetic release 2 to the bimetallic element 4 succeeds particularly well.
- the bimetallic element 4 as in the Fig. 1 shown above the electromagnetic release 2, in particular above the coil 3, is arranged. In this way, the bimetallic element 4 is heated not only by radiation but also by convection in the form of warm air rising from the electromagnetic actuator 2 and sweeping around the bimetallic element 4.
- a guide device for directing hot air from the electromagnetic release 2 to the bimetallic element 4 may be provided.
- Fig. 1 illustrated variant of the triggering mechanism of a circuit breaker is advantageous, other embodiments are conceivable.
- an intermediate element or an intermediate layer eg Teflon, glass silk
- the bimetallic element 4, the electromagnetic release 2, in particular the coil 3, also touch, whereby the bimetallic element 4 is well heated by heat conduction.
- the bimetal element 4 forms at least part of the yoke 5 of the electromagnetic release 2.
- the yoke 5 can be moved past the top of the coil 3.
- the bimetallic element 4 is heated on the one hand by eddy currents, on the other hand, it forms part of the yoke 5 of the electromagnetic release 2, resulting in a particularly strong synergistic effect.
- This variant of the invention works particularly well when the bimetallic element 4 has a comparatively high iron content.
- a layer of a bimetal element 4 is often made of magnetic steel anyway and can then simultaneously as part of the iron yoke or yoke 5 of the electromagnetic release 2 serve.
- the magnetic force on the bimetallic element 4 should be taken into account in the case of short-circuit currents, and also that eddy currents at a frequency of 50 Hz contribute a comparatively small proportion to heating of the bimetallic element 4.
- the Fig. 2 now shows a variant of a trigger mechanism of the WO 2014/083191 A1 known circuit breaker, which in the Fig. 1 variant is very similar.
- the coil 3 of the electromagnetic release 2 has a substantially larger cross section than that in the Fig. 1 shown coil 3 and is therefore suitable for a higher rated current.
- the bimetal element 4 is bent downwards in the front region. In essence, the functioning of the in the Fig. 2 shown triggering mechanism but the same as for in the Fig. 1 illustrated trigger mechanism.
- the distance between the bimetallic elements 4 and the electromagnetic release 2, in particular their coils 3, is substantially the same for a plurality of different circuit breakers of a series of circuit breakers, as in the Figures 1 and 2 is shown.
- the heat transfer from the electromagnetic release 2 to the bimetal element 4 within a series of circuit breakers with different thickness coil wire is substantially equal.
- the coils 3 have substantially the same inner diameter. However, this is by no means mandatory. It would also be conceivable, for example, that the coils 3 all have substantially the same outer diameter. As a result, the heat transfer from the electromagnetic release 2 to the bimetal element 4 within a series of circuit breakers with different thickness coil wire without adjustment of the distance of the bimetallic element 4 by means of the screw 7 is substantially the same size.
- the different thickness coil wires can be wound on bobbin tubes with different diameters, so that arise within the series of circuit breakers coil 3 with substantially the same outer diameter.
- the bimetallic element 4 curves towards the coil 3 when heated.
- the trigger mechanism can also be constructed so that the bimetallic element 4 bends away when heated from the coil 3.
- the bimetallic element 4 in the Figures 1 and 2 be arranged under the coil 3 and attack, for example, on a projection of the latch support 19.
- the bimetallic element 4 is in its (unheated) initial position very close to the coil 3. Bends the bimetallic element 4 when heated then down, the latch support 19 is moved counterclockwise, causing the trigger mechanism in the already continue is triggered as described above.
- the bimetallic element 4 can, as in the Figures 1 and 2 is shown, actively apply a thermoelastic force for unlatching a trigger mechanism. Alternatively, it would also be possible that the bimetal element 4 is biased and holds the trigger mechanism in the ON state. Does this power go? upon heating of the bimetallic element 4 back, the trigger mechanism is triggered, that is, the switching contact 1 is disconnected.
- FIGS. 3 and 4 now show an embodiment of a trigger mechanism of a circuit breaker according to the present invention, in which the bimetallic element 4 acts indirectly via the electromagnetic release 2 on the switching contact 1 and a connected to the switching contact lever system.
- the electromagnetic release 2 including the bimetallic element 4 acting on it and the fixed contact 11 is shown.
- the lever system with the contact piece which can be designed as in the Figures 1 and 2 but not shown.
- the electromagnetic release 2 comprises a movably mounted impact armature 25 respectively plunger, on which the bimetallic element 4 acts indirectly via a leaf spring 26 arranged transversely to the direction of movement of the impact armature / plunger 25.
- the leaf spring 26 is fixedly mounted at one end to the electromagnetic release 2 and connected at the other end to the bimetallic element 4.
- the leaf spring 26 is mounted at one end via a fixed pivot joint and connected at the other end articulated to the bimetallic element 4.
- the electromagnetic release 2 comprises a first and second sleeve 27 and 28 of the magnetic circuit, which are made in particular of ferromagnetic material.
- the preferably made of plastic impact armature / plunger 25 is slidably mounted in the first sleeve 27 and is pulled away by means of a compression spring 29 in the direction of the leaf spring 26 and thus independently of the leaf spring 26 from the lever system.
- the impact anchor / plunger 25 is further mounted in the second sleeve 28, which in turn is slidably mounted in the sleeve 30, which is preferably made of plastic.
- the electromagnetic release 2 comprises a fastening screw 31 for fastening the bimetallic element 4.
- the triggering mechanism shown is now as follows, the Fig. 3 the release mechanism in a dormant state, the Fig. 4 in the triggered state shows: In the in Fig. 3 shown state is the guided over the circuit breaker current within the allowable range, so that the impact armature / plunger 25 is retracted by the compression spring 29. Now increases the guided over the circuit breaker and thus on the coil 3 current, so on the one hand, the two sleeves 27 and 28 are attracted by the electromagnetic force, on the other hand, the bimetallic element 4 is heated and bends visibly outward.
- the current through the coil 3 also leads to a heating of the bimetallic element 4, which bends against the force of the leaf spring 26 and against the force of the compression spring 29 to the outside. Characterized the leaf spring 26 is pulled into a more or less elongated shape and thus presses the impact armature / plunger 25 against the lever system, not shown. Also in this case, the ever narrowing air gap between the two sleeves 27 and 28 leads to an increase in the electromagnetic force.
- the triggering of the circuit breaker thus depends both on the temperature of the bimetallic element 4 and the current through the coil 3.
- the temperature of the bimetallic element 4 represents a temporal integral of the current through the coil 3, so that the influence of the bimetallic element 4 predominates in currents which are indeed long-lasting but only slightly above a permissible value. However, if the current rises very rapidly and very far above a permissible value, then the influence of the electromagnetic force on the impact armature / plunger 25 prevails.
- the leaf spring 26 acts in this example on that end of the impact armature / plunger 25, which faces away from the switching contact 1 and the lever system 13. This allows the interface between the Impact armature / plunger 25 and the switch contact 1 and the lever system 13 are kept simple. In addition, such an arrangement can also be used for existing systems, since the said interface does not need to be changed.
- the leaf spring 16 is only on the impact armature / plunger 25, resulting in a simple construction of the circuit breaker.
- the leaf spring 26 may also have fork-shaped ends, in which a notch in the bimetallic element 4 engages (see also 6 and 7 ).
- a rotary joint between the leaf spring 26 and the bimetallic element 4 can be realized in a simple manner.
- the bimetallic element 4 has fork-shaped ends, in which a notch in the leaf spring 26 engages.
- the bimetal element 4 bends when heated to the electromagnetic release 2 out.
- the combination with the leaf spring 26 results in a progressive course of the force acting on the plunger 25 force.
- the Fig. 5 now shows an embodiment which in the FIGS. 3 and 4 similar embodiment shown.
- the bimetallic element 4 is bent upwards in the initial state (shown in solid lines) and bends downwards when heated (drawn in broken lines).
- the leaf spring 26 is curved forward upon heating of the bimetal element 4 and pushes the impact armature / plunger 25 in the direction of the schematically illustrated lever system 13.
- the impact armature / plunger 25 is at low power solely by the leaf spring 26 from the lever system 13 pulled away until the impact armature / plunger 25 rests on a housing wall 10.
- Another spring is not provided, the use of which is not excluded.
- the impact anchor / plunger 25 is mounted in the front region in the yoke 5, in the rear part in the plastic sleeve 30.
- the illustrated arrangement also comprises an insulation 32.
- Fig. 5 shown trigger mechanism is similar to the operation of the in the FIGS. 3 and 4 illustrated arrangement.
- the triggering of the circuit breaker depends both on the temperature of the bimetallic element 4 and the current through the coil 3.
- the temperature of the bimetallic element 4 again represents a time integral of the current through the coil 3, which is why the influence of the bimetallic element 4 predominates in currents which, although long-lasting but only slightly above a permissible value.
- the influence of the electromagnetic force on the impact armature / plunger 25 prevails, which pulls it in the direction of the yoke 5 or in the direction of the lever system 13.
- the Fig. 6 shows the leaf spring 26, the Fig. 7 the bimetal element 4 now in detail in plan view. Good to see are the recesses with which the two parts are hooked into each other. In this case, the fork-like extensions of the leaf spring 26 engage in the notches of the bimetallic element 4, whereby a kind of articulated connection is formed. Similarly, the leaf spring 26 is mounted in the lower region in the yoke 5. Of course, it is also conceivable for the same purpose that the bimetallic element 4 has fork-shaped ends, in which a notch in the leaf spring 26 engages. The arrangement shown is of course not only on the in Fig. 5 shown trigger mechanism applicable, but can also in which in the FIGS. 3 and 4 shown trigger mechanism can be used.
- the leaf spring 26 acts again in this example on that end of the impact armature / plunger 25, which faces away from the switching contact 1 and the lever system 13.
- the interface between the impact armature / plunger 25 and the switching contact 1 or the lever system 13 can again be kept simple or used for existing systems.
- the leaf spring 26 is also connected / hooked to the impact armature / plunger 25. As a result, both tensile and compressive forces between the leaf spring 26 and the impact armature / plunger 25 can be transmitted.
- the bimetal element 4 bends when heated beyond the electromagnetic release 2 out. By combining with the leaf spring 26, this results in a progressive course of the force acting on the plunger 25 force. Likewise, this results in a degressive course of the distance traveled by the plunger 25 path relative to the path, which is covered by the free end (or by the force acting on the leaf spring 26 end) of the bimetal element 4.
- the Fig. 8 now shows another example of a trigger mechanism in which the bimetallic element 4 acts indirectly via the electromagnetic release 2 on a switching contact respectively on a lever system connected to the switching contact (shown here only symbolically) of the circuit breaker.
- two bimetallic elements 4 are inserted into the iron or iron yoke 5 of the electromagnetic release 2 such that a magnetic flux through the iron / iron yoke in a first position (drawn through) of the at least one bimetallic Element 4 at a first temperature is less than the magnetic flux through the iron circle / iron yoke in a second position (shown in broken lines) of the at least one bimetallic element 4 at a second temperature.
- the electromagnetic release 2 comprises, in addition to a coil 3 and a centrally arranged and preferably made of plastic sleeve 30 two sleeves 27 and 28, a front disc 33 and a rear disc 34 which form parts of the iron / iron yoke.
- the bimetal elements form 4 parts of the iron circle / iron yoke.
- bimetal elements 4 are inserted in the iron circle / iron yoke. It would also be conceivable that only one bimetallic element 4 or more bimetallic elements 4 is inserted in the iron circle / iron yoke / are.
- the bimetal elements 4 are arranged according to the invention parallel to a direction of movement of the plunger 15 of the electromagnetic release 2. This results in a particularly compact design of the circuit breaker.
- the function of in the Fig. 8 The release mechanism shown is now as follows: In a rest state, the bimetallic elements 4 are more or less straight in this example, resulting in the iron / iron yoke air gaps, which adjoin the bimetallic elements 4. As the heating increases, the bimetallic elements 4 curve towards the coil 3, whereby the air gaps become smaller.
- the illustrated electromagnetic release 2 thus has air gaps in the iron circle / iron yoke, which are variable as a function of the temperature of the bimetallic element 4. From a certain temperature, the bimetallic elements 4 are so strongly curved that the air gaps are closed.
- the magnetic flux in the iron circuit or iron yoke and thus the generated electromagnetic force on a plunger 25 of the electromagnetic release 2 can be influenced.
- the bimetallic element 4 indirectly via the electromagnetic release 2 influence on the switching contact respectively cooperating with this lever system 13. It is advantageous in this arrangement that the force that must apply the bimetallic element 4 is very low, since this essentially acts as a switch. The bimetallic elements 4 can therefore be kept very small.
- triggering the release of the circuit breaker depends on both the temperature of the bimetallic element 4 and the current through the coil 3.
- the temperature of the bimetallic element 4 again represents a time integral of the current through the coil 3, which is why the influence of the bimetallic element 4 predominates in currents which, although long-lasting but only slightly above a permissible value.
- the influence of the electromagnetic force on the impact armature / plunger 25 prevails, which pulls it in the direction of the yoke 5 or in the direction of the lever system 13.
- the first temperature associated with a larger air gap is less than the second temperature associated with a smaller air gap.
- the magnetic flux and, as a result, the force acting on the plunger 4 of the electromagnetic actuator 2 are greater at the higher temperature.
- An increase in the current thus always causes an increase in said force, regardless of whether this is due to the current through the coil 3 of the electromagnetic release 2 or by a change of the bimetallic element 4 from the first to the second position due to the increased current.
- triggering mechanisms are suitable in which the bimetal element 4 acts indirectly via the electromagnetic release 2 on a switching contact or on a lever system 13 of the circuit breaker connected to the switching contact (see in particular FIGS FIGS. 3 to 8 ), especially for use in existing systems.
- the lever system 13 does not need to be changed, since the bimetallic element 4, as shown above, acts indirectly on the lever system 13 via the plunger 4. From the perspective of the lever system 13, nothing changes with the use of such a triggering mechanism.
- triggering mechanisms also mutatis mutandis to the in the FIGS. 3 to 8 shown triggering mechanisms are applicable.
- Bimetallic element 4 spaced from the electromagnetic release 2 may be arranged.
- the bimetallic element 4 and the electromagnetic release 2 can also be arranged directly adjacent in the circuit breaker.
- the bimetal element 4 is at least in the thermal coupling with the electromagnetic release 2 and / or the electromagnetic release 2 at least in the thermal coupling with the bimetallic element 4 is provided with a coating / which at least 90% of the infrared radiation absorbed.
- the bimetallic element 4 is arranged above the electromagnetic release 2 or a guide device for directing hot air from the electromagnetic release 2 to the bimetal element 4 is provided.
- the bimetallic element 4 forms part of the yoke 5 of the electromagnetic release 2.
- the distance between the bimetallic element 4 and the electromagnetic release 2 in the case of several circuit breakers may be substantially the same.
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- Thermally Actuated Switches (AREA)
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Description
Die Erfindung betrifft einen Leitungsschutzschalter, umfassend zumindest zwei Anschlusskontakte, die innerhalb des Leitungsschutzschalters Ć¼ber einen Schaltkontakt elektrisch verbunden sind, einen auf den Schaltkontakt wirkenden elektromagnetischen Auslƶser, dessen Spule zwischen die zumindest zwei Anschlusskontakte geschaltet ist, und einen auf den Schaltkontakt wirkenden Bimetall-Aktuator respektive ein auf den Schaltkontakt wirkendes Bimetall-Element.The invention relates to a circuit breaker, comprising at least two terminal contacts, which are electrically connected within the circuit breaker via a switching contact, an acting on the switching contact electromagnetic release whose coil is connected between the at least two terminal contacts, and acting on the switching contact bimetallic actuator respectively a bimetallic element acting on the switching contact.
Leitungsschutzschalter (kurz "LS-Schalter" beziehungsweise engl. "circuit breaker") dienen dem Schutz einer Leitung vor zu hoher Strombelastung. Wird ein vorgegebenen Grenzwert Ć¼berschritten, so wird der zwischen den Anschlusskontakten liegende Schaltkontakt geƶffnet und damit der Stromkreis unterbrochen. Die Auslƶsung in herkƶmmlichen Leitungsschutzschaltern kann in der Regel elektromagnetisch, mit Hilfe eines Bimetall-Elements, manuell sowie in vielen FƤllen auch Ć¼ber einen externen Anschluss erfolgen.Circuit breakers (short "LS-Schalter" or English "circuit breaker") are used to protect a line against excessive current load. If a predetermined limit is exceeded, the switching contact located between the terminals is opened and thus the circuit is interrupted. The tripping in conventional circuit breakers can usually be done electromagnetically, by means of a bimetallic element, manually and in many cases also via an external connection.
Die elektromagnetische Auslƶsung zielt vor allem auf das Trennen des Stromkreises bei hohem Ćberstrom ab. Weil die Spule des elektromagnetischen Auslƶsers des Leitungsschutzschalters vom Strom durchflossen ist, welcher auch Ć¼ber die Anschlusskontakte flieĆt, ist die vom elektromagnetischen Auslƶser erzeugte Kraft abhƤngig von der StromstƤrke. Ćber einem bestimmten Schwellwert wird der Schaltkontakt durch diese Kraft geƶffnet. Der elektromagnetische Auslƶser spricht sehr schnell an, wodurch die Verzƶgerungszeit zwischen dem Auftreten eines Ćberstroms und dem Ćffnen des Schaltkontakts nur sehr kurz ist.The electromagnetic release is aimed primarily at the disconnection of the circuit at high overcurrent. Since the coil of the electromagnetic release of the circuit breaker is traversed by the current flowing through the terminals, the force generated by the electromagnetic release is dependent on the current. Above a certain threshold, the switching contact is opened by this force. The electromagnetic release responds very quickly, whereby the delay time between the occurrence of an overcurrent and the opening of the switch contact is only very short.
Die Auslƶsung Ć¼ber das Bimetall-Element (zumeist in Streifenform) erfolgt deutlich langsamer und soll vor allem Ć¼bermƤĆig lang anhaltenden Strom, welcher nur geringfĆ¼gig Ć¼ber einem festgesetzten Grenzwert liegt, verhindern. Das Bimetall-Element ist zu diesem Zweck in die elektrische Verbindung zwischen den Anschlusskontakten des Leitungsschutzschalters geschaltet und wird demzufolge von dem Ć¼ber die Anschlusskontakte flieĆenden Strom durchflossen. Dabei wird das Bimetall-Element entsprechend seinem elektrischen Widerstand allmƤhlich erwƤrmt und schaltet nach einer Verzƶgerungszeit ab, die von der Hƶhe des Stroms abhƤngt. Ein hƶherer Ćberstrom fĆ¼hrt dabei zu einem frĆ¼heren Abschalten, ein niedrigerer Strom zu einem spƤteren Abschalten.The triggering via the bimetallic element (usually in strip form) takes place much slower and is intended above all to prevent excessively long-lasting current, which is only slightly above a set limit. The bimetallic element is connected for this purpose in the electrical connection between the terminals of the circuit breaker and is therefore flowed through by the current flowing through the terminal contacts current. In this case, the bimetallic element is gradually heated according to its electrical resistance and switches off after a delay time, which depends on the magnitude of the current. A higher overcurrent leads to an earlier shutdown, a lower current to a later shutdown.
Generell kƶnnen der elektromagnetische Auslƶser beziehungsweise das Bimetall-Element direkt oder indirekt auf den Schaltkontakt wirken. In letzterem Fall kƶnnen der elektromagnetische Auslƶser/das Bimetall-Element insbesondere auf ein mit dem Schaltkontakt verbundenes Hebelsystem wirken.In general, the electromagnetic release or the bimetal element can act directly or indirectly on the switching contact. In the latter case, the electromagnetic release / the bimetallic element may in particular act on a lever system connected to the switching contact.
Nachteilig an bekannten Leitungsschutzschaltern ist, dass das Bimetall-Element durch die mitunter sehr hohen Ć¼ber die Anschlusskontakte des Leitungsschutzschalters flieĆenden Strƶme belastet wird. Weiterhin ist der Aufbau eines Leitungsschutzschalters aufgrund der vielen Einzelteile aufwƤndig. SchlieĆlich verursacht der Ć¼ber das Bimetall-Element flieĆende Strom, welcher auch als Ohmscher Widerstand wirkt, eine erhebliche Verlustleistung und fĆ¼hrt damit zu einem schlechten Wirkungsgrad des Leitungsschutzschalters.A disadvantage of known circuit breakers that the bimetallic element is loaded by the sometimes very high currents flowing through the terminals of the circuit breaker currents. Furthermore, the structure of a circuit breaker is complex due to the many items. Finally, the current flowing through the bimetallic element, which also acts as an ohmic resistor, causes a considerable power loss and thus leads to a poor efficiency of the circuit breaker.
Aus der
Eine Aufgabe der Erfindung ist es nun, den aus der
Diese Aufgabe wird durch einen Leitungsschutzschalter gemĆ¤Ć Anspruch 1 gelƶst.This object is achieved by a circuit breaker according to
Auf diese Weise wird das Bimetall-Element passiv beheizt, das heiĆt lediglich durch die AbwƤrme des elektromagnetischen Auslƶsers erwƤrmt. In Folge kann auch die am Leitungsschutzschalter abfallende Verlustleistung verringert werden. DarĆ¼ber hinaus werden der thermische und elektromagnetische Kurzschlussauslƶser rƤumlich und funktionell vereint, das heiĆt sie kƶnnen eine Baugruppe bilden. Dadurch wird der Aufbau eines Leitungsschutzschalters vereinfacht.In this way, the bimetallic element is passively heated, that is, heated only by the waste heat of the electromagnetic release. As a result, the power loss at the circuit breaker can also be reduced. In addition, the thermal and electromagnetic short-circuit release are combined spatially and functionally, ie they can form an assembly. This simplifies the construction of a circuit breaker.
DarĆ¼ber eignet sich die offenbarte Anordnung besonders fĆ¼r den Einsatz in bestehenden Systemen. Der Schaltkontakt beziehungsweise das Hebelsystem brauchen dazu ja nicht verƤndert werden, da das Bimetall-Element indirekt Ć¼ber den einen Eisenkreis beziehungsweise EisenrĆ¼ckschluss des elektromagnetischen Auslƶsers auf den Schaltkontakt/das Hebelsystem wirkt. Aus Sicht des Schaltkontakts/Hebelsystems Ƥndert sich bei Einsatz eines solchen Auslƶsemechanismus nichts.In addition, the disclosed arrangement is particularly suitable for use in existing systems. The switch contact or the lever system do not need to be changed, since the bimetallic element acts indirectly via the one iron circuit or iron yoke of the electromagnetic release on the switching contact / the lever system. From the perspective of the switch contact / lever system, nothing changes with the use of such a trigger mechanism.
In der Regel strebt man fĆ¼r den thermischen Auslƶser eines Leitungsschutzschalters (d.h. fĆ¼r das Bimetall-Element) eine weitgehende UnabhƤngigkeit von der Umgebungstemperatur an. Deswegen wƤhlt man die "Arbeitstemperatur", also jene Temperatur bei der die KrĆ¼mmung des Bimetall-Elements so groĆ ist, dass der Schaltkontakt geƶffnet wird, vergleichsweise hoch (z.B. Ć¼ber 100Ā°C). AuĆerdem sollte das Bimetall-Element ein ausreichendes Arbeitsvermƶgen fĆ¼r die Auslƶsung des Auslƶsemechanismus des Leitungsschutzschalters aufweisen. Das heiĆt, das Produkt aus Weg und Kraft am freien Ende des Bimetall-Elements sollte ausreichend groĆ sein. DafĆ¼r ist ein ausreichender Abstand der Arbeitstemperatur zur Referenztemperatur (z.B. 20Ā°C) nƶtig.As a rule, one strives for the thermal release of a circuit breaker (ie for the bimetallic element) to a high degree of independence from the ambient temperature. Therefore, one chooses the "working temperature", ie the temperature at which the curvature of the bimetallic element is so large that the switching contact is opened comparatively high (eg above 100 Ā° C). In addition, the bimetallic element should have sufficient working capacity for the triggering have the triggering mechanism of the circuit breaker. That is, the product of travel and force at the free end of the bimetallic element should be sufficiently large. This requires a sufficient distance from the working temperature to the reference temperature (eg 20 Ā° C).
In der Spule eines Magnetauslƶsers eines Leitungsschutzschalters ist im Ćberlastbereich in der Regel eine Temperatur gegeben, die als Arbeitstemperatur fĆ¼r das Bimetall ausreichend ist. Weiterhin ist auch die Heizleistung des genannten elektromagnetischen Auslƶsers in den meisten FƤllen ausreichend, um das Bimetall-Element zu beheizen und eine sichere Auslƶsung des Leitungsschutzschalters durch das Bimetall-Element zu gewƤhrleisten.In the coil of a magnetic release of a circuit breaker in the overload region is usually given a temperature that is sufficient as the working temperature for the bimetal. Furthermore, the heating power of said electromagnetic release is sufficient in most cases to heat the bimetallic element and to ensure safe triggering of the circuit breaker by the bimetallic element.
Weiterhin ist folgender Umstand fĆ¼r das genannte Funktionsprinzip von Vorteil: Spulen fĆ¼r groĆe Nennstrƶme weisen eine geringe Windungszahl bei groĆem Leiterquerschnitt auf, wohingegen Spulen fĆ¼r kleine Nennstrƶme eine im Vergleich dazu groĆe Windungszahl mit geringem Leiterquerschnitt aufweisen. Dadurch werden grƶĆenordnungsmƤĆig im Wesentlichen gleiche magnetische KrƤfte Ć¼ber einen groĆen Nennstrombereich erzielt. DemgemĆ¤Ć ist auch die in WƤrme umgesetzte Leistung grƶĆenordnungsmƤĆig gleich.Furthermore, the following circumstance is advantageous for the said operating principle: coils for large rated currents have a low number of turns with a large conductor cross section, whereas coils for small rated currents have a comparatively large number of turns with a small conductor cross section. As a result, essentially the same magnetic forces are achieved over a large nominal current range on the order of magnitude. Accordingly, the power converted to heat is also the order of magnitude equal.
Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den UnteransprĆ¼chen sowie aus der Beschreibung in Zusammenschau mit den Figuren.Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims and from the description in conjunction with the figures.
GĆ¼nstig ist es aber auch, wenn das Bimetall-Element beabstandet zum elektromagnetischen Auslƶser, insbesondere beabstandet zur Spule, angeordnet ist. Dadurch kann eine gute elektrische Isolation zwischen dem elektromagnetischen Auslƶser, insbesondere dessen Spule, und dem Bimetall-Element erzielt werden. Ein Kurzschluss der Spule durch das Bimetall-Element wird somit auch dann vermieden, wenn die Isolation der Spule aus irgendeinem Grund defekt sein sollte.It is also favorable if the bimetallic element is arranged at a distance from the electromagnetic release, in particular at a distance from the coil. Thereby, a good electrical insulation between the electromagnetic release, in particular its coil, and the bimetallic element can be achieved. A short circuit of the coil by the bimetallic element is thus avoided even if the insulation of the coil should be defective for some reason.
In einer bevorzugten Variante des Leitungsschutzschalters sind das Bimetall-Element und der elektromagnetische Auslƶser, insbesondere dessen Spule, im Leitungsschutzschalter direkt benachbart angeordnet. Auf diese Weise kann das Bimetall-Element gut durch thermische Strahlung erwƤrmt werden. "Direkt benachbart" bedeutet in diesem Zusammenhang, dass zwischen dem elektromagnetischen Auslƶser, insbesondere dessen Spule, und dem Bimetall-Element in der fĆ¼r die WƤrmeĆ¼bertragung durch Strahlung relevanten Zone keine nennenswerte Abschirmung durch andere Bauteile erfolgt. Bevorzugt sollen wenigstens 90% der vom elektromagnetischen Auslƶser, insbesondere dessen Spule, in dieser Zone ausgehenden Strahlen ungehindert auf das Bimetall-Element auftreffen. Das sind 90% jener Strahlen, welche vom elektromagnetischen Auslƶser ausgehen und aufgrund der rƤumlichen Lage des elektromagnetischen Auslƶsers und des Bimetall-Elements zueinander prinzipiell auf das Bimetall-Element treffen kƶnnen.In a preferred variant of the circuit breaker, the bimetallic element and the electromagnetic release, in particular its coil, are arranged directly adjacent in the circuit breaker. In this way, the bimetallic element can be well heated by thermal radiation. "Directly adjacent" in this context means that between the electromagnetic triggers, in particular its coil, and the bimetallic element in the relevant for the heat transfer by radiation zone no significant shielding by other components. Preferably, at least 90% of the radiation emitted by the electromagnetic release, in particular its coil, in this zone rays should impinge unhindered on the bimetallic element. That is 90% of those rays, which emanate from the electromagnetic release and due to the spatial position of the electromagnetic release and the bimetallic element to each other in principle can hit the bimetallic element.
Besonders vorteilhaft ist es, wenn das Bimetall-Element wenigstens im Bereich der thermischen Kopplung mit dem elektromagnetischen Auslƶser und/oder der der elektromagnetische Auslƶser wenigstens im Bereich der thermischen Kopplung mit dem Bimetall-Element mit einer Beschichtung versehen ist/sind, welche wenigstens 90% der Infrarotstrahlung absorbiert. Auf diese Weise gelingt die WƤrmeĆ¼bertragung vom elektromagnetischen Auslƶser auf das Bimetall-Element besonders gut. Das Bimetall-Element und/oder der elektromagnetische Auslƶser kƶnnen zu diesem Zweck entsprechen beschichtet sein. FĆ¼r eine gute WƤrmeĆ¼bertragung ist dabei das Absorptionsvermƶgen im Infrarotbereich relevant, im sichtbaren WellenlƤngenbereich kƶnnen die genannten Elemente durchaus eine andere Farbe als schwarz haben.It is particularly advantageous if the bimetallic element is / are provided with a coating at least in the region of the thermal coupling with the electromagnetic release and / or the electromagnetic release at least in the region of the thermal coupling with the bimetal element, which is at least 90%. the infrared radiation absorbs. In this way, the heat transfer from the electromagnetic release to the bimetallic element succeeds particularly well. The bimetallic element and / or the electromagnetic release may be coated accordingly for this purpose. For a good heat transfer, the absorption capacity in the infrared range is relevant, in the visible wavelength range, the elements mentioned may well have a different color than black.
GĆ¼nstig ist es, wenn das Bimetall-Element oberhalb des elektromagnetischen Auslƶsers, insbesondere oberhalb der Spule, angeordnet ist oder eine Leitvorrichtung zum Leiten heiĆer Luft vom elektromagnetischen Auslƶser auf das Bimetall-Element vorgesehen ist. Auf diese Weise kann das Bimetall-Element gut durch Konvektion erwƤrmt werden. Vom elektromagnetischen Auslƶser aufsteigende warme Luft streicht dabei um das Bimetall-Element und erwƤrmt dieses. Besonders vorteilhaft ist es dabei, wenn dabei eine turbulente Strƶmung erzeugt wird, insbesondere durch die Form des elektromagnetischen Auslƶsers, dessen Spule oder der Leitvorrichtung.It is advantageous if the bimetallic element is arranged above the electromagnetic release, in particular above the coil, or a guide device for directing hot air from the electromagnetic release to the bimetal element is provided. In this way, the bimetallic element can be well heated by convection. Warm air rising from the electromagnetic release sweeps around the bimetallic element and heats it. It is particularly advantageous in this case if a turbulent flow is generated, in particular by the shape of the electromagnetic release, its coil or the guide device.
In einer besonders bevorzugten AusfĆ¼hrungsform des Leitungsschutzschalters bildet das Bimetall-Element wenigstens einen Teil eines Jochs des elektromagnetischen Auslƶsers. Einerseits kann das Bimetall-Element wiederum durch Wirbelstrƶme erwƤrmt werden, andererseits bildet es einen Teil des magnetischen Jochs des elektromagnetischen Auslƶsers, wodurch sich ein besonders starker synergetischer Effekt ergibt. Diese Variante der Erfindung funktioniert dann besonders gut, wenn das Bimetall-Element einen vergleichsweise hohen Eisenanteil hat. Generell tragen Wirbelstrƶme bei einer Frequenz von 50 Hz nur einen vergleichsweise kleinen Anteil zu ErwƤrmung des Bimetall-Elements bei.In a particularly preferred embodiment of the circuit breaker, the bimetallic element forms at least part of a yoke of the electromagnetic release. On the one hand, the bimetallic element can in turn be heated by eddy currents, on the other hand, it forms part of the magnetic yoke of electromagnetic trigger, resulting in a particularly strong synergistic effect. This variant of the invention works particularly well when the bimetallic element has a comparatively high iron content. In general, eddy currents at a frequency of 50 Hz contribute only a comparatively small proportion to heating of the bimetallic element.
Bei einer Baureihe von mehreren Leitungsschutzschaltern ist es darĆ¼ber hinaus von Vorteil, wenn die Spulen aus unterschiedlich dickem Draht gefertigt sind und im Wesentlichen denselben Durchmesser, insbesondere AuĆendurchmesser, aufweisen. Dadurch kann eine Baureihe von Leitungsschutzschaltern mit relativ wenigen unterschiedlichen Bauformen seiner Bestandteile aufgebaut werden, da alle Spulen denselben Durchmesser (vorzugsweise denselben AuĆendurchmesser) aufweisen und die Bauteile des Leitungsschutzschalters ohne grƶĆere Adaptierungen zueinander passen. Im Idealfall brauchen Ć¼berhaupt keine unterschiedlichen Bauformen der Bestandteile der Leitungsschutzschalter vorgesehen sein. In einer vorteilhaften Variante werden die unterschiedlich dicken SpulendrƤhte zudem auf SpulenhĆ¼lsen mit unterschiedlichem Durchmesser gewickelt, sodass sich innerhalb der Baureihe von Leitungsschutzschaltern Spulen mit im Wesentlichen demselben AuĆendurchmesser ergeben.In a series of multiple circuit breakers, it is also advantageous if the coils are made of different thickness wire and have substantially the same diameter, in particular outer diameter. As a result, a series of circuit breakers with relatively few different designs of its components can be constructed, since all coils have the same diameter (preferably the same outer diameter) and the components of the circuit breaker fit without major adaptations to each other. Ideally, no different types of components of the circuit breaker need be provided at all. In an advantageous variant, the differently thick coil wires are also wound on bobbin tubes with different diameters, so that within the series of circuit breakers result in coils with substantially the same outer diameter.
GĆ¼nstig ist es bei einer Baureihe von mehreren Leitungsschutzschaltern schlieĆlich, wenn der Abstand zwischen dem Bimetall-Element und dem elektromagnetischen Auslƶser, insbesondere dessen Spule, bei mehreren Leitungsschutzschaltern im Wesentlichen gleich groĆ ist. Auf diese Weise wird erreicht, dass der WƤrmeĆ¼bergang von dem elektromagnetischen Auslƶser auf das Bimetall-Element innerhalb einer Baureihe von Leitungsschutzschaltern mit unterschiedlich dickem Spulendraht im Wesentlichen gleich ist.It is favorable in a series of several circuit breakers, finally, if the distance between the bimetallic element and the electromagnetic release, in particular its coil, is substantially equal in several circuit breakers. In this way, it is achieved that the heat transfer from the electromagnetic release to the bimetallic element within a series of circuit breakers with different thickness coil wire is substantially equal.
Eine vorteilhafte Bauform des Leitungsschutzschalters ergibt sich weiterhin, wenn das Bimetall-Element direkt oder indirekt auf dem Schlaganker/StƶĆel des elektromagnetischen Auslƶsers auf den Schaltkontakt oder ein damit verbundenes Hebelsystem wirkt. Dadurch kann noch stƤrker Einfluss auf den elektromagnetischen Auslƶser genommen werden.An advantageous design of the circuit breaker results further when the bimetallic element acts directly or indirectly on the impact armature / plunger of the electromagnetic release on the switching contact or an associated lever system. This allows even more influence on the electromagnetic release can be taken.
Vorteilhaft ist es dabei, wenn der Leitungsschutzschalter eine quer zur Bewegungsrichtung des Schlagankers/StƶĆels angeordnete und auf den Schlaganker/StƶĆel wirkende Blattfeder umfasst, welche an einem Ende gegenĆ¼ber dem elektromagnetischen Auslƶser fix gelagert und am anderen Ende mit dem Bimetall-Element verbunden ist, insbesondere gelenkig gelagert und/oder verbunden.It is advantageous if the circuit breaker comprises a transverse to the direction of movement of the impact armature / plunger and acting on the impact armature / plunger leaf spring which is fixedly mounted at one end to the electromagnetic release and connected at the other end to the bimetallic element, in particular articulated and / or connected.
GĆ¼nstig ist es, wenn die Blattfeder auf jenes Ende des Schlagankers/StƶĆels wirkt, dass dem Schaltkontakt beziehungsweise dem Hebelsystem abgewandt ist. Dadurch kann die Schnittstelle zwischen dem Schlagankers/StƶĆel und dem Schaltkontakt beziehungsweise dem Hebelsystem einfach gehalten werden. DarĆ¼ber hinaus kann eine solche Anordnung auch fĆ¼r bestehende Systeme eingesetzt werden, da die besagte Schnittstelle dazu nicht geƤndert werden braucht.It is advantageous if the leaf spring acts on that end of the impact armature / plunger that faces away from the switching contact or the lever system. As a result, the interface between the impact armature / plunger and the switching contact or the lever system can be kept simple. In addition, such an arrangement can also be used for existing systems, since the said interface does not need to be changed.
GĆ¼nstig ist es zudem, wenn die Blattfeder auf dem Schlaganker/StƶĆel lediglich aufliegt. Dadurch ergibt sich eine einfache Bauweise des Leitungsschutzschalters.It is also beneficial if the leaf spring rests on the impact armature / plunger only. This results in a simple construction of the circuit breaker.
GĆ¼nstig ist es darĆ¼ber hinaus, wenn die Blattfeder mit dem Schlaganker/StƶĆel verbunden/verhakt ist. Dadurch kƶnnen sowohl Zug- als auch DruckkrƤfte zwischen dem der Blattfeder und dem Schlaganker/StƶĆel Ć¼bertragen werden.In addition, it is favorable if the leaf spring is connected / hooked to the impact armature / plunger. As a result, both tensile and compressive forces can be transmitted between the leaf spring and the impact armature / plunger.
Vorteilhaft ist es, wenn die die Blattfeder / das Bimetall-Element gabelfƶrmige Enden aufweist, in welche eine Einkerbung im Bimetall-Element / in der Blattfeder eingreift. Dadurch kann auf einfache Weise ein Drehgelenk zwischen der Blattfeder und dem Bimetall-Element realisiert werden.It is advantageous if the leaf spring / bimetallic element has forked ends into which a notch in the bimetallic element / in the leaf spring engages. As a result, a rotary joint between the leaf spring and the bimetallic element can be realized in a simple manner.
Vorteilhaft ist es weiterhin, wenn die Blattfeder / der StƶĆel eine Ausnehmung aufweist, in welche eine Einkerbung im StƶĆel / in der Blattfeder eingreift. Dadurch kann auf einfache Weise ein Drehgelenk zwischen der Blattfeder und dem StƶĆel realisiert werden.It is also advantageous if the leaf spring / the plunger has a recess into which engages a notch in the plunger / in the leaf spring. As a result, a rotary joint between the leaf spring and the plunger can be realized in a simple manner.
Vorteilhaft ist es, wenn sich das Bimetall-Element bei ErwƤrmung vom elektromagnetischen Auslƶser weg biegt. In Kombination mit einer Blattfeder ergibt sich dadurch degressiver Verlauf der auf den StƶĆel wirkenden Kraft. Ebenso ergibt sich dabei ein progressiver Verlauf des vom StƶĆel zurĆ¼ckgelegten Wegs bezogen auf den Weg, der von dem freien Ende des Bimetall-Elements zurĆ¼ckgelegt wird.It is advantageous if the bimetallic element bends away when heated by the electromagnetic release. In combination with a leaf spring results in degressive course of the force acting on the plunger force. Likewise, this results in a progressive course of the distance traveled by the plunger path relative to the path, which is covered by the free end of the bimetal element.
Vorteilhaft ist es aber auch, wenn sich das Bimetall-Element bei ErwƤrmung zum elektromagnetischen Auslƶser hin biegt. Dadurch kann das Bimetall-Element direkt auf den StƶĆel des elektromagnetischen Auslƶsers drĆ¼cken. Bei Kombination mit einer Blattfeder ergibt sich darĆ¼ber hinaus ein progressiver Verlauf der auf den StƶĆel wirkenden Kraft. Ebenso ergibt sich dabei ein degressiver Verlauf des vom StƶĆel zurĆ¼ckgelegten Wegs bezogen auf den Weg, der von dem freien Ende des Bimetall-Elements zurĆ¼ckgelegt wird.But it is also advantageous if the bimetallic element bends when heated to the electromagnetic release. This allows the bimetal element to press directly on the plunger of the electromagnetic release. In combination with a leaf spring also results in a progressive course of the force acting on the plunger force. Likewise, this results in a degressive course of the distance traveled by the plunger path relative to the path, which is covered by the free end of the bimetal element.
GĆ¼nstig ist es, wenn auf den Schlaganker/StƶĆel eine Druckfeder wirkt, deren Kraft vom Schaltkontakt beziehungsweise dem Hebelsystem weg gerichtet ist. Dadurch wird der Schlaganker/StƶĆel unabhƤngig von der Blattfeder vom Schaltkontakt beziehungsweise dem Hebelsystem weg gezogen. Diese Variante ist insbesondere von Vorteil, wenn die Blattfeder nur auf dem Schlaganker/StƶĆel aufliegt aber nicht mit diesem verbunden/verhakt ist.It is advantageous if a compression spring acts on the impact armature / plunger whose force is directed away from the switching contact or the lever system. As a result, the impact armature / plunger is pulled away from the switching contact or the lever system, regardless of the leaf spring. This variant is particularly advantageous if the leaf spring rests only on the impact armature / plunger but not connected / hooked with this.
Besonders vorteilhaft ist es auch, wenn das Bimetall-Element indirekt Ć¼ber den Eisenkreis beziehungsweise EisenrĆ¼ckschluss des elektromagnetischen Auslƶsers auf den Schaltkontakt wirkt. Dadurch kƶnnen RĆ¼ckwirkungen auf das Bimetall-Element, wo wie sie entstehen kƶnnen, wenn das Bimetall-Element auf den StƶĆel des elektromagnetischen Auslƶsers wirkt, vermieden oder zumindest verringert werden.It is also particularly advantageous if the bimetal element acts indirectly on the iron contact or iron yoke of the electromagnetic release on the switching contact. As a result, repercussions on the bimetal element, where they can arise when the bimetallic element acts on the plunger of the electromagnetic release, can be avoided or at least reduced.
Vorteilhaft ist es in diesem Zusammenhang, wenn das zumindest eine Bimetall-Element derart in einen Eisenkreis beziehungsweise EisenrĆ¼ckschluss des elektromagnetischen Auslƶsers eingefĆ¼gt ist, dass ein magnetischer Fluss durch den Eisenkreis/EisenrĆ¼ckschluss in einer ersten Stellung des zumindest einen Bimetall-Elements bei einer ersten Temperatur kleiner ist als der magnetische Fluss durch den Eisenkreis/EisenrĆ¼ckschluss in einer zweiten Stellung des zumindest einen Bimetall-Elements bei einer zweiten Temperatur. Vorteilhaft kann so der magnetische Fluss im Eisenkreis beziehungsweise EisenrĆ¼ckschluss und damit die erzeugte elektromagnetische Kraft auf einen StƶĆel des elektromagnetischen Auslƶsers beeinflusst werden. Damit nimmt das Bimetall-Element Einfluss indirekt Ć¼ber den elektromagnetischen Auslƶser Einfluss auf den Schaltkontakt. Vorteilhaft ist die Kraft, die das Bimetall-Element aufbringen muss, sehr gering, da dieses im Wesentlichen als Schalter wirkt. Das Bimetall-Element kann daher sehr klein gehalten werden.It is advantageous in this context, if the at least one bimetallic element is inserted into an iron or iron yoke of the electromagnetic release such that a magnetic flux through the iron / iron yoke in a first position of the at least one bimetallic element at a first temperature smaller is the magnetic flux through the iron circle / iron yoke in a second position of the at least one bimetallic element at a second temperature. Advantageously, the magnetic flux in the iron circuit or iron yoke and thus the generated electromagnetic force on a plunger of the electromagnetic release can be influenced. Thus, the bimetallic influence indirectly influences the switching contact via the electromagnetic release. Advantageously, the force that has to apply the bimetallic element, very low, since this in the Essentially acts as a switch. The bimetallic element can therefore be kept very small.
GĆ¼nstig ist es dabei, wenn die erste Temperatur kleiner ist als die zweite Temperatur. Dadurch sind der magnetische Fluss und damit die auf einen StƶĆel des elektromagnetischen Auslƶsers wirkende Kraft bei der hƶheren Temperatur grƶĆer. Eine Zunahme des Stroms bewirkt daher stets eine Erhƶhung der genannten Kraft, egal ob dies durch den Strom durch die Spule des elektromagnetischen Auslƶsers oder durch einen Wechsel des Bimetall-Elements von der ersten in die zweite Stellung aufgrund des erhƶhten Stroms erfolgt.It is advantageous if the first temperature is less than the second temperature. As a result, the magnetic flux and thus the force acting on a plunger of the electromagnetic release force at the higher temperature are greater. An increase in the current thus always causes an increase of said force, regardless of whether this is done by the current through the coil of the electromagnetic release or by a change of the bimetallic element from the first to the second position due to the increased current.
Besonders vorteilhaft ist es, wenn der Leitungsschutzschalter einen in AbhƤngigkeit der Temperatur des zumindest einen Bimetall-Elements verƤnderlichen Luftspalt im Eisenkreis/EisenrĆ¼ckschluss umfasst. Dadurch kann der magentische Fluss im Eisenkreis/EisenrĆ¼ckschluss des elektromagnetischen Auslƶsers relativ stark beeinflusst werden, da der durch den Luftspalt gebildete magnetische Widerstand linear von der GrƶĆe des Luftspalts abhƤngt.It is particularly advantageous if the circuit breaker comprises a variable in function of the temperature of the at least one bimetallic element air gap in the iron / iron yoke. As a result, the magnetic flux in the iron circle / iron yoke of the electromagnetic release can be relatively strongly influenced, since the magnetic resistance formed by the air gap depends linearly on the size of the air gap.
GĆ¼nstig ist es weiterhin, wenn genau ein Luftspalt je Bimetall-Element im Eisenkreis/EisenrĆ¼ckschluss in AbhƤngigkeit der Temperatur des genannten Bimetall-Elements verƤnderlich ist. Dadurch ergibt sich ein vergleichsweise einfacher Aufbau des elektromagnetischen Auslƶsers, da ein Ende des Bimetall-Elements mit dem Eisenkreis/EisenrĆ¼ckschluss fix verbunden werden kann.It is also favorable if exactly one air gap per bimetallic element in the iron circuit / iron yoke is variable as a function of the temperature of said bimetallic element. This results in a comparatively simple construction of the electromagnetic release, since one end of the bimetal element can be fixedly connected to the iron circle / iron yoke.
GĆ¼nstig ist es aber auch, wenn genau zwei Luftspalte je Bimetall-Element im Eisenkreis/EisenrĆ¼ckschluss in AbhƤngigkeit der Temperatur des genannten Bimetall-Elements verƤnderlich sind. Auf diese Weise kann der Einfluss des Bimetall-Elements verstƤrkt werden.It is also favorable if exactly two air gaps per bimetal element in the iron circle / iron yoke are variable as a function of the temperature of said bimetallic element. In this way, the influence of the bimetallic element can be enhanced.
Vorteilhaft ist es, wenn ein bei der ersten Temperatur vorhandener Luftspalt bei der zweiten Temperatur geschlossen ist. Auf diese Weise ist der Einfluss des Bimetall-Elements auf den Eisenkreis/EisenrĆ¼ckschluss des elektromagnetischen Auslƶsers besonders groĆ.It is advantageous if an air gap existing at the first temperature is closed at the second temperature. In this way, the influence of the bimetallic element on the iron circle / iron yoke of the electromagnetic release is particularly large.
GĆ¼nstig ist es, wenn genau ein Bimetall-Element in den Eisenkreis/EisenrĆ¼ckschluss eingefĆ¼gt ist. Dadurch ergibt sich ein vergleichsweise einfacher Aufbau des elektromagnetischen Auslƶsers.It is favorable if exactly one bimetal element is inserted into the iron circle / iron yoke. This results in a comparatively simple construction of the electromagnetic release.
GĆ¼nstig ist es aber auch, wenn genau zwei Bimetall-Elemente in den Eisenkreis/EisenrĆ¼ckschluss eingefĆ¼gt sind. Bei entsprechender Auslegung kann dadurch eine Notfunktion des elektromagnetischen Auslƶsers auch dann aufrecht erhalten werden, wenn ein Bimetall-Element aus irgendeinem Grund ausfallen sollte.But it is also beneficial if exactly two bimetallic elements are inserted in the iron circle / iron yoke. With appropriate design, an emergency function of the electromagnetic release can be maintained even if a bimetallic element should fail for any reason.
ErfindungsgemĆ¤Ć ist das zumindest eine Bimetall-Element parallel zu einer Bewegungsrichtung eines StƶĆels des elektromagnetischen Auslƶsers angeordnet. Dadurch ergibt sich eine besonders kompakte Bauweise des Leitungsschutzschalters.According to the invention, the at least one bimetallic element is arranged parallel to a direction of movement of a plunger of the electromagnetic release. This results in a particularly compact design of the circuit breaker.
GĆ¼nstig ist es schlieĆlich, wenn der Leitungsschutzschalter ein zwischen einem Innenschenkel des Eisenkreises/EisenrĆ¼ckschlusses und der Spule des elektromagnetischen Auslƶsers angeordnetes Kunststoff-Rohr aufweist. Bei entsprechender Wahl des Kunststoffs kann die Reibung zwischen dem Kunststoff-Rohr und dem Innenschenkel, der im Kunststoff-Rohr insbesondere auch verschiebbar gelagert sein kann, gering gehalten werden. Zudem wird auch der magnetische Fluss auf den genannten Innenschenkel konzentriert.Finally, it is favorable if the circuit breaker has a plastic tube arranged between an inner limb of the iron circuit / iron yoke and the coil of the electromagnetic release. With appropriate choice of the plastic, the friction between the plastic tube and the inner leg, which can be mounted in the plastic tube in particular also displaceable, be kept low. In addition, the magnetic flux is concentrated on the said inner leg.
Die obigen Ausgestaltungen und Weiterbildungen der Erfindung lassen sich auf beliebige Art und Weise kombinieren.The above embodiments and developments of the invention can be combined in any manner.
Die vorliegende Erfindung wird nachfolgend anhand der in den schematischen Figuren der Zeichnung angegebenen AusfĆ¼hrungsbeispiele nƤher erlƤutert. Es zeigen dabei:
- Fig. 1
- ein erstes Beispiel fĆ¼r einen Auslƶsemechanismus des aus der
WO 2014/083191 A1 - Fig. 2
- ein zweites Beispiel fĆ¼r einen Auslƶsemechanismus des aus der
WO 2014/083191 A1 - Fig. 3
- ein Beispiel fĆ¼r einen Auslƶsemechanismus gemĆ¤Ć der vorliegenden Erfindung, bei dem ein Bimetall-Element indirekt Ć¼ber eine Blattfeder auf einen StƶĆel eines elektromagnetischen Auslƶsers wirkt;
- Fig. 4
- die in
Fig. 3 dargestellte Anordnung in einem Auslƶsezustand; - Fig. 5
- ein weiteres Beispiel fĆ¼r einen Auslƶsemechanismus gemĆ¤Ć der vorliegenden Erfindung, bei dem ein Bimetall-Element indirekt Ć¼ber eine Blattfeder auf einen StƶĆel eines elektromagnetischen Auslƶsers wirkt;
- Fig. 6
- eine beispielhafte Blattfeder in Draufsicht;
- Fig. 7
- ein beispielhaftes Bimetall-Element in Draufsicht und
- Fig. 8
- ein Beispiel fĆ¼r einen Auslƶsemechanismus gemĆ¤Ć der vorliegenden Erfindung, bei dem ein Bimetall-Element den Eisenkreis beziehungsweise EisenrĆ¼ckschluss eines elektromagnetischen Auslƶsers beeinflusst.
- Fig. 1
- a first example of a triggering mechanism of the
WO 2014/083191 A1 - Fig. 2
- a second example of a trigger mechanism of the
WO 2014/083191 A1 - Fig. 3
- an example of a triggering mechanism according to the present invention, in which a bimetallic element acts indirectly via a leaf spring on a plunger of an electromagnetic release;
- Fig. 4
- in the
Fig. 3 illustrated arrangement in a trigger state; - Fig. 5
- another example of a trigger mechanism according to the present invention, in which a bimetallic element acts indirectly via a leaf spring on a plunger of an electromagnetic release;
- Fig. 6
- an exemplary leaf spring in plan view;
- Fig. 7
- an exemplary bimetallic element in plan view and
- Fig. 8
- an example of a triggering mechanism according to the present invention, in which a bimetallic element affects the iron or iron yoke of an electromagnetic release.
Konkret umfasst der elektromagnetische Auslƶser 2 neben der Spule 3 auch ein Joch 5 sowie einen in der
Auf diese Weise kann der Schaltpunkt beziehungsweise der Auslƶsepunkt des Bimetall-Elements 4 justiert werden. Weiterhin kann der Abstand des Bimetall-Elements 4 zum elektromagnetischen Auslƶser 2 an verschieden groĆe Spulen 3 angepasst werden. Obwohl fĆ¼r unterschiedliche StromstƤrken unterschiedlich groĆe Drahtquerschnitte der Spulen 3 benƶtigt werden und die Spulen 3 auch ansonsten unterschiedliche Abmessungen aufweisen kƶnnen, kƶnnen dadurch Leitungsschutzschalter fĆ¼r unterschiedliche Strƶme im Wesentlichen gleich aufgebaut sein.In this way, the switching point or the triggering point of the
Der Schaltkontakt 1 umfasst einen feststehenden Festkontakt 11 sowie ein bewegliches SchaltstĆ¼ck 12, das gleichzeitig Teil eines Hebelsystems 13 ist. Das SchaltstĆ¼ck 12 ist aus GrĆ¼nden der besseren VerstƤndlichkeit mit kleinen Ringen gekennzeichnet, um die Funktion des Hebelsystems 13 nachfolgend besser erlƤutern zu kƶnnen. Das Hebelsystem 13 umfasst weiterhin einen SchaltstĆ¼ck-TrƤger 14, der um eine gehƤusefeste Achse 15 drehbar gelagert ist und mit Punkten gekennzeichnet ist. Das SchaltstĆ¼ck 12 ist um die auf dem SchaltstĆ¼ck-TrƤger 14 angeordnete Achse 16 drehbar gelagert. Weiterhin umfasst das Hebelsystem 13 eine Klinke 17, die um eine auf dem SchaltstĆ¼ck-TrƤger 14 angeordnete Achse 18 drehbar gelagert ist und ebenfalls mit Punkten gekennzeichnet ist. DarĆ¼ber hinaus umfasst das Hebelsystem 13 eine Klinkenauflage 19, die um die Achse 15 drehbar gelagert ist und mit kleinen Kreuzen gekennzeichnet ist. SchlieĆlich umfasst das Hebelsystem 13 eine Torsionsfeder 20, welche die Klinke 17 und die Klinkenauflage 19 gegeneinander drĆ¼ckt, sowie eine Zugfeder 21, deren Kraft auf das SchaltstĆ¼ck 12 wirkt.The
In der
Die Funktion des in der
In einer EIN-Stellung ist das Bimetall-Element 4 gerade, sodass die Torsionsfeder 20 die Klinkenauflage 19 auf die Klinke 17 drĆ¼ckt und sich die Klinke 17 mit ihrem Fortsatz in der Klinkenauflage 19 verhakt. Dadurch kƶnnen der SchaltstĆ¼ck-TrƤger 14, die Klinke 17 und die Klinkenauflage 19 nur gemeinsam bewegt, das heiĆt um die gehƤusefeste Achse 15 gedreht werden. Die Feder 21 zieht das SchaltstĆ¼ck 12 im Uhrzeigersinn um die Achse 16, wodurch der Schaltkontakt 1 in der EIN-Stellung geschlossen bleibt. Wird der Schalthebel des Leitungsschalters nun in die AUS-Stellung bewegt, so zieht der BĆ¼gel 24 den SchaltstĆ¼ck-TrƤger 14, die Klinke 17 und die Klinkenauflage 19, die ineinander verhakt sind, gegen den Uhrzeigersinn und bewirkt damit, dass die Achse 16 nach rechts bewegt wird wodurch in Folge der Schaltkontakts 1 geƶffnet wird.In an ON position, the
Als weitere Mƶglichkeit kann die Auslƶsung des Leitungsschutzschalters durch den elektromagnetischen Auslƶser 2 bewirkt werden. Bei zu hohem Strom drĆ¼ckt der Schlaganker auf die Klinkenauflage 19, sodass die Verriegelung zwischen der Klinke 17 und der Klinkenauflage 19 aufgehoben wird. Die Klinkenauflage 19 und die Klinke 17 befinden sich dann in der in
In Ƥhnlicher Weise erfolgt die Auslƶsung des Leitungsschutzschalters mit Hilfe des Bimetall-Elements 4. Dieses drĆ¼ckt bei starker ErwƤrmung auf einen Vorsprung der Klinkenauflage 19, wodurch diese wiederum um die Achse 15 gegen den Uhrzeigersinn gedreht und damit die Verriegelung zwischen der Klinke 17 und der Klinkenauflage 19 aufgehoben wird. Diese Situation ist in der
Die Auslƶsung durch den elektromagnetischen Auslƶser 2 und das Bimetall-Element 4 sind also im Wesentlichen gleichwirkend. Lediglich die Angriffspunkte, die Richtungen sowie gegebenenfalls die GrƶĆe der vom elektromagnetischen Auslƶser 2 respektive dem Bimetall-Element 4 auf die Klinkenauflage 19 aufgebrachten KrƤfte sind unterschiedlich. In beiden FƤllen wird jedoch eine Drehung der Klinkenauflage 19 um die Achse 15 gegen den Uhrzeigersinn bewirkt.The triggering by the
Durch die Anordnung des Bimetall-Elements 4 in unmittelbarer NƤhe des elektromagnetischen Auslƶsers 2 wird das Bimetall-Element 4 durch die AbwƤrme des elektromagnetischen Auslƶsers 2 erwƤrmt. Der elektromagnetische Auslƶser 2, dessen Hauptfunktion das Detektieren von Kurzschlussstrƶmen und das Ćffnen des Schaltkontakts 1 bei Ćberstrom ist, wirkt also gleichzeitig als Heizwicklung. Dadurch ergibt sich eine Doppelnutzung des elektromagnetischen Auslƶsers 2.Due to the arrangement of the
Der in der
Im vorliegenden Beispiel ist das Bimetall-Element 4 beabstandet zum elektromagnetischen Auslƶser 2, insbesondere beabstandet zur Spule 3, angeordnet. Dadurch kann eine gute elektrische Isolation zwischen dem elektromagnetischen Auslƶser 2, insbesondere dessen Spule 3, und dem Bimetall-Element 4 erzielt werden. Ein Kurzschluss der Spule 3 durch das Bimetall-Element 4 wird somit auch dann vermieden, wenn die Isolation der Spule 4 aus irgendeinem Grund defekt sein sollte. Je nƤher das Bimetall-Element 4 am elektromagnetischen Auslƶser 2 angeordnet ist, umso besser ist jedoch die WƤrmeĆ¼bertragung vom elektromagnetischen Auslƶser 2 an das Bimetall-Element 4.The Indian
In the present example, the
Weiterhin sind das Bimetall-Element 4 und der elektromagnetische Auslƶser 2, insbesondere dessen Spule3, im Leitungsschutzschalter direkt benachbart angeordnet. Auf diese Weise kann das Bimetall-Element 4 gut durch thermische Strahlung erwƤrmt werden, denn zwischen dem elektromagnetischen Auslƶser 2, insbesondere dessen Spule 3, und dem Bimetall-Element 4 erfolgt in der fĆ¼r die WƤrmeĆ¼bertragung durch Strahlung relevanten Zone keine nennenswerte Abschirmung durch andere Bauteile. Bevorzugt trifft wenigstens 90% der vom elektromagnetischen Auslƶser 2, insbesondere dessen Spule 3, in der relevanten Ćbertragungszone ausgehenden Strahlung ungehindert auf das Bimetall-Element 4. In diesem Zusammenhang ist es von Vorteil, wenn das Bimetall-Element 4 so ausgerichtet, dass die WƤrmeĆ¼bertragung auf einer mƶglichst groĆen FlƤche stattfindet.Furthermore, the
Von Vorteil ist es in diesem Zusammenhang auch, wenn das Bimetall-Element 4 wenigstens im Bereich der thermischen Kopplung mit dem elektromagnetischen Auslƶser 2 und/oder der elektromagnetische Auslƶser 2 wenigstens im Bereich der thermischen Kopplung mit dem Bimetall-Element 4 mit einer Beschichtung versehen ist/sind, welche wenigstens 90% der Infrarotstrahlung absorbiert. Auf diese Weise gelingt die WƤrmeĆ¼bertragung durch Strahlung vom elektromagnetischen Auslƶser 2 auf das Bimetall-Element 4 besonders gut.It is advantageous in this context also if the
Vorteilhaft ist es weiterhin, wenn das Bimetall-Element 4 wie in der
Obwohl die in der
Von Vorteil ist es auch, wenn das Bimetall-Element 4 wenigstens einen Teil des Jochs 5 des elektromagnetischen Auslƶsers 2 bildet. Beispielsweise kann das Joch 5 dazu oben an der Spule 3 vorbeigefĆ¼hrt werden. Dadurch wird das Bimetall-Element 4 einerseits durch Wirbelstrƶme erwƤrmt, andererseits bildet es einen Teil des Jochs 5 des elektromagnetischen Auslƶsers 2, wodurch sich ein besonders starker synergetischer Effekt ergibt. Diese Variante der Erfindung funktioniert dann besonders gut, wenn das Bimetall-Element 4 einen vergleichsweise hohen Eisenanteil aufweist. Eine Schicht eines Bimetall-Elements 4 ist oft ohnehin aus magnetischem Stahl und kann dann gleichzeitig als Teil des EisenrĆ¼ckschlusses beziehungsweise Jochs 5 des elektromagnetischen Auslƶsers 2 dienen. Bei dieser Variante sollte die magnetische Kraft auf das Bimetall-Element 4 bei Kurzschlussstrƶmen berĆ¼cksichtigt werden, und auch dass Wirbelstrƶme bei einer Frequenz von 50 Hz einen vergleichsweise kleinen Anteil zu ErwƤrmung des Bimetall-Elements 4 beitragen.It is also advantageous if the
Die
Von Vorteil ist es, wenn die Spulen 3 mehrerer unterschiedlicher Leitungsschutzschalter einer Baureihe von Leitungsschutzschaltern wie in den
Vorteilhaft ist es zudem, wenn der Abstand zwischen den Bimetall-Elementen 4 und den elektromagnetischen Auslƶser 2, insbesondere deren Spulen 3, bei mehreren unterschiedlichen Leitungsschutzschaltern einer Baureihe von Leitungsschutzschaltern im Wesentlichen gleich groĆ ist, so wie dies in den
Bei der in den
Eine weitere Mƶglichkeit, den Auslƶsemechanismus an verschieden groĆe Spulen 3 anzupassen, ist auch dadurch gegeben, dass ein austauschbares ĆbertragungsstĆ¼ck vorgesehen werden kann, Ć¼ber welches das Bimetall-Element 4 auf der Klinkenauflage 19 angreift. Alternativ kann auch eine unterschiedlich lange Krƶpfung (vergleiche
In den dargestellten Beispielen krĆ¼mmt sich das Bimetall-Element 4 bei ErwƤrmung zur Spule 3 hin. Der Auslƶsemechanismus kann aber auch so aufgebaut sein, dass sich das Bimetall-Element 4 bei ErwƤrmung von der Spule 3 weg biegt. Beispielsweise kƶnnte das Bimetall-Element 4 in den
Das Bimetall-Element 4 kann, so wie dies in den
Die
Konkret umfasst der elektromagnetische Auslƶser 2 einen beweglich gelagerten Schlaganker 25 respektive StƶĆel, auf den das Bimetall-Element 4 indirekt Ć¼ber eine quer zur Bewegungsrichtung des Schlagankers/StƶĆels 25 angeordnete Blattfeder 26 wirkt. Die Blattfeder 26 ist an einem Ende gegenĆ¼ber dem elektromagnetischen Auslƶser 2 fix gelagert und am anderen Ende mit dem Bimetall-Element 4 verbunden. Insbesondere ist die Blattfeder 26 an einem Ende Ć¼ber ein fixes Drehgelenk gelagert und am anderen Ende gelenkig mit dem Bimetall-Element 4 verbunden.Specifically, the
Weiterhin umfasst der elektromagnetische Auslƶser 2 eine erste und zweite HĆ¼lse 27 und 28 des Magnetkreises, welche insbesondere aus ferromagnetischem Material gefertigt sind. Der vorzugsweise aus Kunststoff gefertigte Schlaganker/StƶĆel 25 ist in der ersten HĆ¼lse 27 verschiebbar gelagert und wird mit Hilfe einer Druckfeder 29 in Richtung der Blattfeder 26 und damit unabhƤngig von der Blattfeder 26 vom Hebelsystem weggezogen. Der Schlaganker/StƶĆel 25 ist weiterhin in der zweiten HĆ¼lse 28 gelagert, die ihrerseits in der HĆ¼lse 30, welche vorzugsweise aus Kunststoff gefertigt ist, verschiebbar gelagert ist. Weiterhin umfasst der elektromagnetische Auslƶser 2 eine Befestigungsschraube 31 zum Befestigen des Bimetall-Elements 4.Furthermore, the
Die Funktion des in den
In dem in
In the in
Der Strom durch die Spule 3 fĆ¼hrt aber auch zu einer ErwƤrmung des Bimetall-Elements 4, das sich gegen die Kraft der Blattfeder 26 und gegen die Kraft der Druckfeder 29 nach auĆen biegt. Dadurch wird die Blattfeder 26 in eine mehr oder minder gestreckte Form gezogen und drĆ¼ckt damit den Schlaganker/StƶĆel 25 gegen das nicht dargestellte Hebelsystem. Auch in diesem Fall fĆ¼hrt der stetig enger werdende Luftspalt zwischen den beiden HĆ¼lsen 27 und 28 zu einer Zunahme der elektromagnetischen Kraft.But the current through the
Die Auslƶsung des Leitungsschutzschalters hƤngt damit sowohl von der Temperatur des Bimetall-Elements 4 als auch dem aktuellen Strom durch die Spule 3 ab. Die Temperatur des Bimetall-Elements 4 stellt dabei gleichsam ein zeitliches Integral des Stroms durch die Spule 3 dar, weswegen der Einfluss des Bimetall-Elements 4 bei Strƶmen Ć¼berwiegt, welche zwar lang andauernden aber nur wenig Ć¼ber einem zulƤssigen Wert liegen. Steigt der Strom aber sehr rasch und sehr weit Ć¼ber einen zulƤssigen Wert, dann Ć¼berwiegt der Einfluss der elektromagnetischen Kraft auf den Schlaganker/StƶĆel 25.The triggering of the circuit breaker thus depends both on the temperature of the
Generell weist die in den
Weiterhin liegt die Blattfeder 16 auf dem Schlaganker/StƶĆel 25 lediglich auf, wodurch sich eine einfache Bauweise des Leitungsschutzschalters ergibt. Vorteilhaft kann die die Blattfeder 26 auch gabelfƶrmige Enden aufweisen, in welche eine Einkerbung im Bimetall-Element 4 eingreift (vergleiche auch
In diesem Beispiel biegt sich das Bimetall-Element 4 bei ErwƤrmung zum elektromagnetischen Auslƶser 2 hin. Durch die Kombination mit der Blattfeder 26 ergibt sich ein progressiver Verlauf der auf den StƶĆel 25 wirkenden Kraft. Ebenso ergibt sich dabei ein degressiver Verlauf des vom StƶĆel 25 zurĆ¼ckgelegten Wegs bezogen auf den Weg, der von dem freien Ende (beziehungsweise von dem auf die Blattfeder 26 wirkenden Ende) des Bimetall-Elements 4 zurĆ¼ckgelegt wird.In this example, the
Die
Die Funktion des in
Die
Generell weist die in der
In diesem Beispiel ist die Blattfeder 26 mit dem Schlaganker/StƶĆel 25 darĆ¼ber hinaus verbunden/verhakt. Dadurch kƶnnen sowohl Zug- als auch DruckkrƤfte zwischen der Blattfeder 26 und dem Schlaganker/StƶĆel 25 Ć¼bertragen werden.In this example, the
Bei der in
Die
Konkret umfasst der elektromagnetische Auslƶser 2 neben einer Spule 3 und einer zentrisch angeordneten und vorzugsweise aus Kunststoff gefertigten HĆ¼lse 30 zwei HĆ¼lsen 27 und 28, eine vordere Scheibe 33 und eine hintere Scheibe 34 welche Teile des Eisenkreises/EisenrĆ¼ckschlusses bilden. Zudem bilden auch die Bimetall-Elemente 4 Teile des Eisenkreises/EisenrĆ¼ckschlusses.Specifically, the
Im vorliegenden Beispiel sind genau zwei Bimetall-Elemente 4 in den Eisenkreis/EisenrĆ¼ckschluss eingefĆ¼gt. Denkbar wƤre aber auch, dass lediglich ein Bimetall-Element 4 oder noch mehr Bimetall-Elemente 4 in den Eisenkreis/EisenrĆ¼ckschluss eingefĆ¼gt ist/sind. Die Bimetall-Elemente 4 sind erfindungsgemĆ¤Ć parallel zu einer Bewegungsrichtung des StƶĆels 15 des elektromagnetischen Auslƶsers 2 angeordnet. Dadurch ergibt sich eine besonders kompakte Bauweise des Leitungsschutzschalters.In the present example, exactly two
Die Funktion des in der
In einem Ruhezustand sind die Bimetall-Elemente 4 in diesem Beispiel mehr oder weniger gerade, wodurch sich im Eisenkreises/EisenrĆ¼ckschlusses Luftspalte ergeben, welche an die Bimetall-Elemente 4 angrenzen. Bei zunehmender ErwƤrmung krĆ¼mmen sich die Bimetall-Elemente 4 zur Spule 3 hin, wodurch die Luftspalte kleiner werden. Der gezeigte elektromagnetische Auslƶser 2 weist also Luftspalte im Eisenkreis/EisenrĆ¼ckschluss auf, welche verƤnderlich in AbhƤngigkeit der Temperatur des Bimetall-Elements 4 sind. Ab einer bestimmten Temperatur sind die Bimetall-Elemente 4 so stark gekrĆ¼mmt, dass die Luftspalte geschlossen sind.The function of in the
In a rest state, the
Vorteilhaft kann so der magnetische Fluss im Eisenkreis beziehungsweise EisenrĆ¼ckschluss und damit die erzeugte elektromagnetische Kraft auf einen StƶĆel 25 des elektromagnetischen Auslƶsers 2 beeinflusst werden. Damit nimmt das Bimetall-Element 4 indirekt Ć¼ber den elektromagnetischen Auslƶser 2 Einfluss auf den Schaltkontakt respektive das mit diesem zusammenwirkende Hebelsystem 13. Vorteilhaft ist an dieser Anordnung, dass die Kraft, die das Bimetall-Element 4 aufbringen muss, sehr gering ist, da dieses im Wesentlichen als Schalter wirkt. Die Bimetall-Elemente 4 kƶnnen daher sehr klein gehalten werden.Advantageously, the magnetic flux in the iron circuit or iron yoke and thus the generated electromagnetic force on a
Im vorliegenden Beispiel sind genau zwei Luftspalte je Bimetall-Element 4 im Eisenkreis/EisenrĆ¼ckschluss vorgesehen, welche in AbhƤngigkeit der Temperatur des genannten Bimetall-Elements 4 verƤnderlich sind. Denkbar wƤre aber auch, dass genau ein Luftspalt je Bimetall-Element 4 im Eisenkreis/EisenrĆ¼ckschluss in AbhƤngigkeit der Temperatur des genannten Bimetall-Elements 4 verƤnderlich ist. Beispielsweise kƶnnte je ein Ende je eines Bimetall-Elements 4 fix mit der Scheibe 33 oder der Scheibe 34 verbunden sein.In the present example, exactly two air gaps per
Durch einen Strom durch die Spule 3 wird eine elektromagnetische Kraft auf die HĆ¼lse 28 und damit auf den StƶĆel 25 erzeugt, welche diesen gegen die Kraft der Druckfeder 29 in Richtung des Hebelsystems 13 zieht. Durch den stetig enger werdenden Luftspalt wird die elektromagnetische Kraft ebenfalls immer grƶĆer. Der magnetische Fluss und damit die elektromagnetische Kraft werden aber auch durch die Luftspalte beeinflusst, welche an die Bimetall-Elemente 4 angrenzen. Bei kleineren Luftspalten sind auch der magnetische Fluss und damit die elektromagnetische Kraft grƶĆer, bei grƶĆeren Luftspalten dementsprechend kleiner. Daher nimmt auch die Temperatur der Bimetall-Elemente 4 Einfluss auf die Kraft, die auf den Schlaganker/StƶĆel 25 wirkt.By a current through the
Auch bei dem in
Vorzugsweise ist die erste Temperatur, welche einem grƶĆeren Luftspalt zugeordnet ist, kleiner ist als die zweite Temperatur, welche einem kleineren Luftspalt zugeordnet ist. Dadurch sind der magnetische Fluss und in Folge die auf den StƶĆel 4 des elektromagnetischen Auslƶsers 2 wirkende Kraft bei der hƶheren Temperatur grƶĆer. Eine Zunahme des Stroms bewirkt daher stets eine Erhƶhung der genannten Kraft, egal ob dies durch den Strom durch die Spule 3 des elektromagnetischen Auslƶsers 2 oder durch einen Wechsel des Bimetall-Elements 4 von der ersten in die zweite Stellung aufgrund des erhƶhten Stroms begrĆ¼ndet ist.Preferably, the first temperature associated with a larger air gap is less than the second temperature associated with a smaller air gap. As a result, the magnetic flux and, as a result, the force acting on the
Generell eignen sich Auslƶsemechanismen, bei dem das Bimetall-Element 4 indirekt Ć¼ber den elektromagnetischen Auslƶser 2 auf einen Schaltkontakt respektive auf ein mit dem Schaltkontakt verbundenes Hebelsystem 13 des Leitungsschutzschalters wirkt (siehe insbesondere die
Weiterhin wird angemerkt, dass die zu den in den
Claims (9)
- Circuit breaker, comprising- at least two terminals, which are electrically connected within the circuit breaker via a switching contact (1),- an electromagnetic trip device (2) acting on the switching contact (1) or on a lever system (13) connected to the switching contact (1), the coil (3) of which is wired between the at least two terminals and- at least one bimetal element (4) acting on the switching contact (1) or on a lever system (13) connected to the switching contact (1),wherein- the electrical connection between the at least two terminals is guided past the bimetal element (4) and the bimetal element (4) is thermally coupled with the said electromagnetic trip device (2) and the at least one bimetal element (4) is disposed parallel to a movement direction of a tappet (25) of the electromagnetic trip device (2), characterised in that- the bimetal element (4) acts indirectly via a magnetic circuit or magnetic yoke of the electromagnetic trip device (2) on the switching contact (1) and- the at least one bimetal element (4) is incorporated into a magnetic circuit/magnetic yoke of the electromagnetic trip device (2) in such a manner that a magnetic flux through the magnetic circuit or magnetic yoke in a first position of the at least one bimetal element (4) at a first temperature is smaller than the magnetic flux through the magnetic circuit/magnetic yoke in a second position of the at least one bimetal element (4) at a second temperature.
- Circuit breaker according to claim 1, characterised in that the first temperature is smaller than the second temperature.
- Circuit breaker according to any of claims 1 to 2, characterised by an air gap in the magnetic circuit or magnetic yoke which is alterable depending on the temperature of the at least one bimetal element (4).
- Circuit breaker according to claim 3, characterised in that precisely one air gap per bimetal element (4) in the magnetic circuit/magnetic yoke is alterable depending on the temperature of the said bimetal element (4).
- Circuit breaker according to claim 3, characterised in that precisely two air gaps per bimetal element (4) in the magnetic circuit/magnetic yoke are alterable depending on the temperature of the said bimetal element (4).
- Circuit breaker according to any of claims 3 to 5, characterised in that an air gap present at the first temperature is closed at the second temperature.
- Circuit breaker according to any of claims 1 to 6, characterised in that precisely one bimetal element (4) is inserted into the magnetic circuit/magnetic yoke.
- Circuit breaker according to any of claims 1 to 6, characterised in that precisely two bimetal elements (4) are inserted into the magnetic circuit/magnetic yoke.
- Circuit breaker according to any of claims 1 to 8, characterised in that the at least one bimetal element (4) is disposed parallel to a movement direction of a tappet (25) of the electromagnetic trip device (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014117035.0A DE102014117035A1 (en) | 2014-11-20 | 2014-11-20 | Circuit breaker with passively heated and acting on an iron yoke of an electromagnetic release bimetallic element |
PCT/EP2015/077264 WO2016079318A1 (en) | 2014-11-20 | 2015-11-20 | Circuit breaker comprising a passively heated bimetal element acting on a magnetic yoke of an electromagnetic tripping device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3221880A1 EP3221880A1 (en) | 2017-09-27 |
EP3221880B1 true EP3221880B1 (en) | 2019-05-08 |
Family
ID=54697567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15798409.7A Active EP3221880B1 (en) | 2014-11-20 | 2015-11-20 | Circuit breaker comprising a passively heated bimetal element acting on a magnetic yoke of an electromagnetic tripping device |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180358196A1 (en) |
EP (1) | EP3221880B1 (en) |
CN (1) | CN107210170B (en) |
DE (1) | DE102014117035A1 (en) |
WO (1) | WO2016079318A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016203506B4 (en) | 2016-03-03 | 2021-10-07 | Siemens Aktiengesellschaft | Tripping device and electromechanical circuit breaker |
CN113903605B (en) * | 2021-09-23 | 2024-03-22 | ęęŗęø č½ēµę°ēµåęéå ¬åø | Novel bypass switch |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2700710A (en) * | 1950-07-12 | 1955-01-25 | Mannes N Glickman | Circuit controller |
US3506941A (en) * | 1967-09-13 | 1970-04-14 | Ite Imperial Corp | Thermal tripping device for circuit breaker |
DE2526571A1 (en) * | 1975-06-13 | 1976-12-30 | Bbc Brown Boveri & Cie | Thermal bimetal trip for electric appliances - is heated via transformer whose iron core has air gap for current adjustment |
DE2646916A1 (en) * | 1976-10-18 | 1978-04-20 | Bbc Brown Boveri & Cie | ELECTRICAL CIRCUIT BREAKER FOR OVERCURRENT AND SHORT CIRCUIT RELEASE |
CH672036A5 (en) * | 1986-12-23 | 1989-10-13 | Sprecher & Schuh Ag | |
US4893101A (en) * | 1988-10-21 | 1990-01-09 | Ericson Manufacturing Company | Resettable ground fault circuit interrupter |
DE19653295A1 (en) * | 1996-12-20 | 1998-06-25 | Abb Patent Gmbh | Overcurrent and short-circuit release for an electrical installation switch |
DE19750875C1 (en) * | 1997-11-18 | 1999-03-18 | Hans Arnhold | Overcurrent release for protection switch |
DE19847155A1 (en) * | 1998-10-13 | 2000-04-20 | Kopp Heinrich Ag | Overcurrent trip device for circuit breakers, has heat conducting tubular body wound with coil, and with stop end and opposite expanded end for mounting and radial support of bimetallic spring plate |
DE19942694C2 (en) * | 1999-09-07 | 2002-06-27 | Eti Elektroelement Dd | Triggers for electrical circuit breakers |
DE10058075A1 (en) * | 2000-11-23 | 2002-06-06 | Abb Patent Gmbh | Electrical switching device for residual current, overcurrent and short-circuit current protection |
EP1815487A1 (en) * | 2004-11-22 | 2007-08-08 | ABB PATENT GmbH | Switching equipment comprising an electromagnetic trip device |
CN202772081U (en) * | 2012-07-25 | 2013-03-06 | äøęµ·čÆäæ”ēµåØč”份ęéå ¬åø | Thermal electromagnetic system of miniature circuit breaker |
DE102012111618A1 (en) * | 2012-11-29 | 2014-06-18 | Eaton Industries (Austria) Gmbh | Circuit breaker with passively heated bimetallic element |
-
2014
- 2014-11-20 DE DE102014117035.0A patent/DE102014117035A1/en not_active Withdrawn
-
2015
- 2015-11-20 WO PCT/EP2015/077264 patent/WO2016079318A1/en active Application Filing
- 2015-11-20 EP EP15798409.7A patent/EP3221880B1/en active Active
- 2015-11-20 US US15/527,715 patent/US20180358196A1/en not_active Abandoned
- 2015-11-20 CN CN201580073726.0A patent/CN107210170B/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
WO2016079318A1 (en) | 2016-05-26 |
EP3221880A1 (en) | 2017-09-27 |
US20180358196A1 (en) | 2018-12-13 |
CN107210170A (en) | 2017-09-26 |
CN107210170B (en) | 2019-12-03 |
DE102014117035A1 (en) | 2016-05-25 |
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