EP3867939B1 - Schmelzsicherung mit integrierter messfunktion - Google Patents

Schmelzsicherung mit integrierter messfunktion Download PDF

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Publication number
EP3867939B1
EP3867939B1 EP19829138.7A EP19829138A EP3867939B1 EP 3867939 B1 EP3867939 B1 EP 3867939B1 EP 19829138 A EP19829138 A EP 19829138A EP 3867939 B1 EP3867939 B1 EP 3867939B1
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EP
European Patent Office
Prior art keywords
fuse
electronics assembly
reception space
housing
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19829138.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3867939A1 (de
Inventor
Robert Hüttinger
Jean-Mary Martel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Filing date
Publication date
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Publication of EP3867939A1 publication Critical patent/EP3867939A1/de
Application granted granted Critical
Publication of EP3867939B1 publication Critical patent/EP3867939B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • H01H85/1755—Casings characterised by the casing shape or form composite casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0266—Structural association with a measurement device, e.g. a shunt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0275—Structural association with a printed circuit board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0291—Structural association with a current transformer

Definitions

  • the invention relates to a safety fuse in which a measuring function is integrated.
  • An example of such an overcurrent protection device is a fuse, for example, which interrupts the circuit by melting one or more fusible conductors if the current strength of the circuit protected by the fuse exceeds a specific value for a specific period of time.
  • the safety fuse consists of an insulating body which has two electrical connections which are electrically conductively connected to one another inside the insulating body by one or more fusible conductors.
  • the fusible conductor which has a reduced cross-section compared to the other conductors in the circuit, is heated by the current flowing through it and melts if the relevant nominal current of the fuse is significantly exceeded for a predetermined period of time. Because of its good insulating properties, ceramic is mostly used as the material for the insulating body.
  • a fuse link of this type is known, for example, from the European patent specification EP 0 917 723 B1 or the German Offenlegungsschriften DE 10 2014 205 871 A1 as well as DE 10 2016 211 621 A1 known in principle.
  • Fuses are available in different types.
  • simple device fuses which have a simple glass cylinder in which the fuse element is accommodated
  • the ceramic body is filled with sand - mostly quartz sand:
  • the fuse element is surrounded by quartz sand.
  • the housing of the safety fuse is formed by a ceramic body in which the solidified sand, the electrical connections and the fusible conductor are accommodated or held.
  • the quartz sand acts as an arc extinguishing agent: if the rated current of the fuse is significantly exceeded - for example due to a high short-circuit current - this leads to the fuse responding, during which the fuse element first melts and then vaporizes due to the high temperature development. This creates an electrically conductive plasma, via which the current flow between the electrical connections is initially maintained - an arc is formed. As the metal vapor of the evaporated fusible conductor is deposited on the surface of the quartz sand grains, the arc is cooled down again. As a result, the resistance inside the fuse link increases to such an extent that the arc is finally extinguished. The electrical line to be protected by the fuse is thus interrupted.
  • NH fuses low-voltage high-performance fuses, so-called NH fuses, but also semiconductor protection fuses, so-called HLS fuses, such as those sold under the product name SITOR, are known in principle from the prior art.
  • NH fuses one or more fusible conductors in the form of metal strips are usually used. In doing so the fusible conductors usually have so-called bottleneck rows for selective switching off of the fuse.
  • at least one solder depot can be applied to one or more of the fusible conductors, with the help of which the overload characteristic of the fuse can be influenced.
  • the let-through energy value I 2 t which is decisive for the switch-off behavior of the fuse, is relatively high for NH fuses, which is why they tend to have a more sluggish characteristic.
  • the fusible conductor heats up to a temperature above the melting temperature of the solder due to an electrical overload current, this solder diffuses into the fusible conductor material and forms an alloy with it. This increases the electrical resistance of the fusible conductor, which leads to its further heating, whereby the diffusion process is further accelerated until the fusible conductor in the vicinity of the solder depot is completely dissolved, so that it tears off, interrupting the current flow. In the event of a brief, permissible overcurrent, the NH fuse does not switch off prematurely. On the other hand, if a short-circuit current occurs, the fusible conductor tears open at the rows of constrictions.
  • NH fuses are used, for example, to protect systems or control cabinets from fire, for example due to overheated connecting cables.
  • the international patent application WO 2017/078525 A1 describes a fuse in which a current sensor is integrated into the pressure body of the fuse. With the help of this current sensor, the current flow through the fuse that occurs during normal operation can be measured and transmitted to an interrogation unit arranged outside of the fuse. However, since comparatively high temperatures can also occur in a fuse, it is questionable how reliably a sensor integrated into the pressure body of the fuse will function over the lifetime of the fuse.
  • the U.S. 2008/042796 A1 describes a cable restrictor comprising a main body having a cavity, the cavity of the body being structured to receive a replaceable fusible element.
  • the EP 2 885 800 B1 discloses an assembly for a fuse switch arrangement with a measuring device and fuse holder for an assembly or a fuse switch arrangement.
  • the invention is therefore based on the object of providing a safety fuse which at least partially overcomes the problems mentioned above.
  • the fuse according to the invention with an integrated measuring function has a fuse housing, which in turn has a first receiving space delimited by a pressure body and a second receiving space spatially delimited from the first receiving space and delimited by a protective body, which are arranged one behind the other in a longitudinal extension direction.
  • a fusible conductor is accommodated and held in the second accommodation space.
  • the measuring device has a current transformer and an electronic assembly which is electrically conductively connected to the current transformer, the current transformer and the electronic assembly being arranged one behind the other in the direction of longitudinal extension.
  • the first and the second receiving space are arranged one behind the other in a longitudinal extension direction L of the safety fuse, i.e. in the axial direction.
  • the pressure body serves to absorb the pressure that occurs when the fuse is heated or triggered. Therefore, high demands are placed on the mechanical strength and stability of the protective housing.
  • only a protective housing is required to delimit the second accommodation space in order to accommodate and fix the measuring device and to protect it from external impairments such as moisture and/or dirt. Significantly lower requirements are therefore placed on the mechanical stability of this housing.
  • the current transformer arranged in the second receiving space serves on the one hand as a current sensor, which forwards the recorded current measurement values to the electronics assembly, where the measurement values are further processed.
  • the energy required for this is also generated with the help of the current transformer through electromagnetic induction from the primary current, i.e. the operating current of the safety fuse.
  • the current transformer thus also serves as an energy source for the electronics assembly. In order to provide sufficient energy for the electronics assembly even with low operating currents of the safety fuse and thus to ensure the reliability of the measuring device, the current transformer must be dimensioned comparatively large for this purpose.
  • the fuse must be kept compact so that it can also be used for retrofit applications as part of a retrofit or modernization of existing systems, in which a conventional fuse is replaced without a measuring device.
  • the safety fuse ideally has the dimensions of a standardized NH fuse
  • the second receiving space, in which the measuring device is received and held is in particular in the axial direction, ie in the longitudinal direction L, greatly limited.
  • the arrangement of the current transformer and the electronics module one behind the other in the axial direction, ie in the direction of longitudinal extension, means that the second receiving space can be kept compact.
  • the electronics assembly is arranged between the current transformer and a closure element of the safety fuse.
  • the current transformer and electronic assembly are two options: either the electronic assembly is arranged between the current transformer and the pressure housing, or between the current transformer and the closure element.
  • the latter option has the advantage that the electronics assembly, which is sensitive compared to the current transformer, is located further away from the pressure housing of the fuse, so that if the fuse trips, the associated increase in pressure and temperature does not directly affect the electronics assembly. The probability of failure of the electronics can be reduced as a result.
  • the current transformer almost completely fills the second receiving space in a radial direction oriented orthogonally to the direction of longitudinal extent.
  • the electronics assembly and the current transformer are arranged one behind the other in the axial direction, ie in the direction of longitudinal extension.
  • the current transformer can be dimensioned in such a way that it almost completely fills the available second receiving space in the radial direction.
  • the volume of the current transformer can thus be optimized in such a way that the energy provided for the electronics assembly is as large as possible. In this way it is possible to use a fuse with an integrated measuring function that does not require an external power source to supply the measuring device with energy.
  • the electronics assembly has a printed circuit board.
  • the electronics assembly In order to meet the requirements of the most compact possible design of the measuring device while at the same time having the largest possible current transformer volume, it is necessary for the electronics assembly to also be designed as compact as possible. This is possible by means of a printed circuit board that is kept compact, for example by using integrated circuits.
  • the electronics assembly is disc-shaped, such that the height of the electronics assembly, together with the height of the current transformer, essentially corresponds to the height of the second receiving space.
  • the disc-shaped design allows a flat design of the electronics assembly, whereby the measuring device - and thus the second receiving space and the protective housing surrounding it - can be kept as compact as possible in the axial direction.
  • the electronics assembly can take up the entire width of the second receiving space up to the delimiting inner wall of the protective housing.
  • the electronics assembly is ring-shaped, with an outer radius and with an opening with an inner radius for passing through a connection element of the safety fuse. Due to the ring-shaped design, the electronics assembly can be adapted to the floor plan of the current transformer. The outer radius can be selected so that it essentially corresponds to the radius of the current transformer. In this way, a compact design of the measuring device can be implemented.
  • the annular shape of the electronic assembly (122) is not closed. If the electronics assembly can be designed to be correspondingly compact, an open design—for example in the form of a C or a semicircle—is also possible.
  • the electronics assembly has a transmission device in order to transmit a measurement signal detected by the measuring device to a receiving device arranged outside of the safety fuse.
  • the determined measurement data or further processed data based on this measurement data can be transmitted to an external unit, for example a data collection device or a control room.
  • an external unit for example a data collection device or a control room.
  • the measurement signal is transmitted wirelessly from the transmission device to the receiving device.
  • Wireless transmission of the data to the external receiving device significantly simplifies the installation work for the safety fuse.
  • Common transmission methods such as Bluetooth, RFID (both active and passive), ZigBee, etc. can be used for wireless transmission of the data—measured values or preprocessed data based on measured values—from the transmission device to the receiving device.
  • the energy required for the transmission is advantageously obtained again from the primary current with the aid of the current transformer by electromagnetic induction.
  • the size of the fuse with an integrated measuring function corresponds to the size of a conventional NH fuse, it is also suitable for retrofit applications as part of an upgrade or modernization of existing systems, in which a conventional fuse without a measuring device is replaced by a fuse with an integrated measuring function. in question.
  • the fuse body for a fuse of the type described above has a first section, which is designed as a pressure body, which delimits the first accommodation space for accommodating the fuse element, and a second section, which is designed as a protective body, which delimits the second accommodation space for accommodating the measuring device. is trained on.
  • the first receiving space and the second receiving space are spatially delimited from one another in the fuse body and are arranged one behind the other in a direction of longitudinal extension.
  • the first section of the fuse body is pressure-stable, i.e. designed to absorb the pressure that occurs when the fuse is triggered, and thus represents the actual pressure body of the fuse, while the second section merely represents a protective function for the measuring device, and its mechanical stability and strength are significantly lower requirements are made.
  • the different mechanical strength properties of the two sections can be achieved using a suitable manufacturing process, for example a 3D printing process.
  • the first and second section form a structural unit, i.e. the two sections do not have to be installed first when replacing or installing the safety fuse, but are already firmly connected to one another, which significantly simplifies the installation work.
  • the fuse body is designed in one piece.
  • a one-piece design of the fuse body is advantageous, since this avoids subsequent assembly steps. The assembly costs can be further reduced as a result.
  • the fuse body is formed from a ceramic material or a thermally stable plastic. Due to their high compressive strength, ceramic materials are particularly suitable for producing a fuse body. Thermostable plastics, provided they are sufficiently thermally stable, are characterized by their simplified processability combined with comparatively low production costs.
  • the fuse body is of multi-part design, with the pressure body being firmly but detachably connected to the protective body.
  • the pressure body and the protective body are formed from different materials.
  • suitable materials for pressure and protective bodies both receiving spaces can be adapted to the different requirements placed on them.
  • the pressure body and the protective body are surrounded by an additional cover.
  • the additional cover which can also consist of paper or a plastic cover, for example, the structural unit of the fuse body stressed. Furthermore, in the case of multi-part designs, dismantling by unauthorized third parties is prevented or at least marked.
  • the fuse body can also be used for retrofit fuses, i.e. as a replacement for a conventional fuse without a measuring function.
  • FIG 1 shows schematically the basic structure of a standardized NH fuse, as is already known from the prior art.
  • the safety fuse 1 has two connection elements 3 which are made of an electrically conductive material, for example copper.
  • the connection elements 3 are designed as blade contacts—this is not essential to the invention, however.
  • the connection elements 3 are mechanically tightly and tightly connected to a protective housing 2 with the height H, which consists of a solid, non-conductive and heat-resistant material, for example ceramic, and serves as a pressure body for the safety fuse 1 .
  • the protective housing 2 generally has a tubular or hollow-cylindrical basic shape and is sealed to the outside in a pressure-tight manner, for example with the aid of two sealing caps 4 .
  • the connection elements 3 each extend through an opening formed in the closure caps 4 into the cavity of the protective housing 2. At least one so-called fusible conductor 5 is arranged in this cavity, which electrically conductively connects the two connection elements 3 to one another.
  • the remaining cavity is usually completely filled with an extinguishing agent 6, which is used to extinguish and cool the fuse 1 in the event of a trip and completely surrounds the fuse element 5.
  • Quartz sand for example, is used as the extinguishing agent 6 .
  • the in figure 1 illustrated one fusible conductor 5 it is also possible to arrange several fusible conductors 5 electrically connected in parallel to one another in the protective housing 2 and to contact them accordingly with the two contact elements 3.
  • the tripping characteristic—and thus the tripping behavior—of the fuse 1 can be influenced by the type, number, arrangement and design of the fusible conductors 3 .
  • the fusible conductor 5 generally consists of a highly conductive material such as copper or silver and has several rows of constrictions 7 and one or more solder depots 8—so-called solder points—over its length, ie in its longitudinal direction L.
  • the tripping characteristic of the safety fuse 1 can also be influenced and adapted to the respective application via the rows of constrictions 7 and the plumb points 8 .
  • At currents that are smaller than the rated current of the fuse 1 only so much power loss is implemented in the fuse element 5 that this in the form of Heat can be released quickly on the extinguishing sand 6, the protective housing 2 and the two connection elements 3 to the outside.
  • the temperature of the fusible conductor 5 does not rise above its melting point.
  • FIG. 2 shows a side view of the fuse 100; the Figures 3 , 4 and 5 show corresponding sectional views of the fuse 100 in plan and elevation.
  • the safety fuse 100 has a fuse housing 110 with a first section 111 and a second section 112 which are arranged one behind the other in a direction L of the longitudinal extension of the safety fuse 100 .
  • the first section 111 is designed as a pressure body 113 for accommodating a fusible conductor 105 .
  • the pressure body 113 serves to absorb the pressure that occurs when the fuse 100 is heated or triggered, which is why high demands are placed on the mechanical strength and stability of the pressure body 113 .
  • a first receiving space 115 is therefore formed within the pressure body 113, in which the fusible conductor 105 is received and held.
  • the first receiving space 115 is limited by the pressure body 113 to the outside in the radial direction R and is closed in the axial direction, ie in the direction of longitudinal extension L, by a closure element 104 .
  • the size of the fuse housing 110 corresponds to that of a standardized NH fuse, as described above figure 1 described. Due to the identical dimensions, the fuse 100 according to the invention is ideally suited for retrofit applications, ie as a replacement for a conventional HN fuse.
  • the safety fuse 100 has two connection elements 103 designed as blade contacts, which are mechanically firmly and tightly connected to the fuse housing 110 .
  • the design of the two connection elements 103 is not essential to the invention.
  • the fusible conductor 105 is electrically conductively connected to the two connection elements 103.
  • the fuse according to the invention is a sand-solidified fuse, then the remaining volume of the first receiving space is 115 filled with sand, usually quartz sand, which completely surrounds the fusible conductor 105 and serves as an extinguishing agent for extinguishing and cooling the fusible conductor 105 in the event that the fuse 100 is triggered.
  • the second section 112 is designed as a protective body 114, which serves to accommodate a measuring device 120 and outwardly delimits a second accommodation space 116 provided for this purpose. Since the protective body 114 only serves to accommodate and fix the measuring device 120 and to protect it from external influences such as moisture and/or dirt, significantly lower requirements are placed on the mechanical stability of the protective body 114 than on those of the pressure body 113.
  • the protective body 114 is firmly connected to the pressure body 113, the first receiving space 115 and the second receiving space 116 being spatially separated from one another by a partition wall 117.
  • the partition wall 117 can be an independent component; however, it is also possible to form the partition wall 117 as part of the pressure body 113 or the protective body 114 .
  • the second receiving space 116 is closed by a further closure element 104 .
  • the lower connection element 103 embodied as a blade contact is guided through the further closure element 104 through the second receiving space 116 into the first receiving space 115 and is electrically conductively connected there to the fusible conductor 105 .
  • the measuring device 120 has a current transformer 121 and an electronics assembly 122 connected to the current transformer 121 .
  • the current transformer 121 is designed in the shape of a ring or torus and is arranged around the lower connection element 103: if a primary current flows through the safety fuse 100, an induction current (secondary current) is generated in the current transformer 121, the size of which allows conclusions to be drawn about the size of the primary current.
  • These measured values can be processed with the aid of the electronics assembly 122 connected to the current transformer 121 .
  • the electronics assembly 122 a microprocessor for processing or pre-processing the determined measurement data.
  • the electronics assembly 122 can also have a transmission device in order to transmit the measurement data or the processed data to a receiving device (not shown) arranged outside the fuse 100—for example a control room or a data collection device.
  • the amount of energy required for the electronics assembly 122 is also obtained from the secondary current generated by the current transformer 121 .
  • the largest possible current transformer volume is required.
  • the current transformer 121 is therefore designed in such a way that its width in the radial direction R is maximized, i.e. the current transformer 121 uses the width of the installation space of the second receiving space 116 available in the protective body 114 as completely as possible.
  • the height of the current transformer 121 corresponds to the height of the second receiving space 116 minus the height of the electronic assembly 122.
  • the second receiving space 116 is utilized as completely as possible by the current transformer 121 and the electronic assembly 122.
  • the volume of the current transformer 121 can be optimized, i.e. increased to such an extent that reliable measurement and transmission of the measurement data can be guaranteed even with a low primary current.
  • connection element 103 is not arranged exactly in the middle, but somewhat eccentrically in the pressure body 113 or in the protective body 114 .
  • the lower connection element 103 is designed to be somewhat narrower in the radial direction, so that it is centered in the second receiving space is arranged.
  • a ring-shaped or toroidal current transformer 121 with a larger outside diameter can be used than would be the case with a connecting element 103 arranged off-centre.
  • the Figures 4 and 5 represent sectional views in the floor plan figure 4
  • the illustrated section through the electronics assembly 122 makes it clear that the electronics assembly 122 is adapted to the inner contour of the protective body 114 in order in this way to optimally utilize the space available in the second receiving space 116 for the electronics assembly 122 .
  • the electronics assembly 122 has a slot-like opening 123 through which the lower connection element 103 is passed. With a corresponding dimensioning of the opening 123, the electronics assembly 122 is thus fixed in terms of its spatial position in the second receiving space, ie accommodated and held.
  • the section through the current transformer 121 shown clearly shows that the second receiving space 116 in the radial direction R is almost completely utilized by the central arrangement of the lower connection element 103 .
  • the inner contour of the protective body 114 is octagonal.
  • this shape is not essential to the invention and is only one of many possibilities; Rounded cross-sections or round, cylindrical shapes could also be considered for this.
  • FIGS Figures 6 and 7 two further exemplary embodiments of the fuse 100 according to the invention are shown schematically. They each show a sectional view through the electronics assembly 122 in plan view—corresponding to FIG figure 4 of the first embodiment.
  • the basic structure of the fuse 100 and the fuse housing 110 corresponds to that in FIGS Figures 2 to 4 illustrated first embodiment.
  • the main difference to the first embodiment is the different Execution of the electronics assembly 122.
  • the electronics assembly 122 is ring-shaped and thus adapted to the shape of the current transformer 121 . It has an outer radius r a and an inner radius r i through which the connecting element 103 is passed.
  • the opening 123 is defined by the inner radius r i .
  • the current transformer 121 and the electronics assembly 122 can be combined to form a structural unit which is assembled together, ie is placed in the second receiving space 116 of the protective body 114 and fastened.
  • FIG 7 shows another embodiment of the electronics assembly 122.
  • This is - analogous to the representation in figure 4 - Adapted to the inner contour of the protective body 114, but not over the entire surface.
  • the opening 123 is designed as an open C, so that the electronics assembly 122 can be plugged onto the connection element 103 laterally—ie in the radial direction.
  • This exemplary embodiment is intended to make it clear that the electronics assembly 122 does not necessarily have to occupy almost the entire space made available to it; in the event that the electronics assembly 122 can be designed to be correspondingly compact, it is also possible to use only parts of the available installation space (as in figure 7 shown) to fill out.
  • the resulting shape of the electronics assembly 122 is not essential to the invention and is only shown as an example as an open C.

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  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Fuses (AREA)
  • Semiconductor Integrated Circuits (AREA)
EP19829138.7A 2018-12-20 2019-12-18 Schmelzsicherung mit integrierter messfunktion Active EP3867939B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018222560 2018-12-20
PCT/EP2019/085955 WO2020127486A1 (de) 2018-12-20 2019-12-18 Schmelzsicherung mit integrierter messfunktion sowie sicherungskörper

Publications (2)

Publication Number Publication Date
EP3867939A1 EP3867939A1 (de) 2021-08-25
EP3867939B1 true EP3867939B1 (de) 2023-02-15

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EP19829138.7A Active EP3867939B1 (de) 2018-12-20 2019-12-18 Schmelzsicherung mit integrierter messfunktion

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Country Link
US (1) US11508541B2 (zh)
EP (1) EP3867939B1 (zh)
CN (1) CN113196440A (zh)
ES (1) ES2939155T3 (zh)
WO (1) WO2020127486A1 (zh)

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Publication number Priority date Publication date Assignee Title
US11923163B2 (en) 2019-01-16 2024-03-05 Siemens Aktiengesellschaft Fuse element and fuse
DE102022211027A1 (de) 2022-10-18 2024-04-18 Siemens Aktiengesellschaft Alterungsüberprüfung für Niederspannungskomponenten

Citations (1)

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WO2000019475A1 (de) * 1998-09-24 2000-04-06 Ascom Powerline Communications Ag Starkstromschmelzsicherung sowie stromverteilungsnetz

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CN113196440A (zh) 2021-07-30
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US11508541B2 (en) 2022-11-22
US20220059307A1 (en) 2022-02-24

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