EP3048630B1 - Indicator and arc fault detection device - Google Patents

Indicator and arc fault detection device Download PDF

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Publication number
EP3048630B1
EP3048630B1 EP15198047.1A EP15198047A EP3048630B1 EP 3048630 B1 EP3048630 B1 EP 3048630B1 EP 15198047 A EP15198047 A EP 15198047A EP 3048630 B1 EP3048630 B1 EP 3048630B1
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EP
European Patent Office
Prior art keywords
detection device
fault detection
arc fault
tripping
fire protection
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
EP15198047.1A
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German (de)
French (fr)
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EP3048630A1 (en
Inventor
Vinod Gideon Dhanraj
Florian Festl
Tobias Keimel
James Saunders
Sebastian Schaich
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Siemens AG
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Siemens AG
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Classifications

    • 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 H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—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 H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • 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 H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release 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 H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H2083/201—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other abnormal electrical condition being an arc fault
    • 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 H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
    • H01H71/0271—Mounting several complete assembled circuit breakers together

Definitions

  • the invention relates to a display device for a fire protection switch and a fire protection switch for detecting an arcing fault.
  • fire protection switch In electrical installation technology, the term "fire protection switch” is understood to mean a protective device for protection against a fault current caused by an arcing fault. Arc fault protection devices of this type are used in low-voltage networks in order to protect the electrical installation technology against damage from a fault current due to an arc fault and its thermal consequences, for example cable fires.
  • An arcing fault can occur, for example, at a defective point on an electrical line, e.g. a loose cable clamp or due to a cable break. If the arcing occurs electrically in series with an electrical consumer, the normal operating current is generally not exceeded, since it is limited by the consumer. For this reason, the arcing fault is not detected by a conventional overcurrent protection device, for example a fuse or a circuit breaker. This is particularly problematic in the case of high operating currents and in the event of arcing faults which exist for a long time, since in these cases there is a risk of fire due to the high temperatures associated with the arcing.
  • both the voltage curve and the current curve are measured over time by the fire protection switch and evaluated using digital signal processing.
  • the current profile in particular has characteristic, high-frequency Shares on.
  • fire protection switches have relatively complex algorithms for monitoring the electrical installation and for detecting possible arcing faults.
  • AFDD Arc Fault Detection Devices
  • UL standard Underwriters laboratories, norm with 110 V mains voltage
  • AFCI Arc Fault Circuit Interrupter
  • arc breakers are even mandatory to use predetermined criteria to determine whether there is an arc in a circuit. For this purpose, the arc protection switches used there have their own isolating contact, which is opened in the event of an arc.
  • fire protection switches In order to nevertheless provide effective protection against arcing faults, protective switches against arcing faults, so-called fire protection switches, are also increasingly being used in Germany. In contrast to the models available on the US market, these fire protection switches generally do not have their own isolating contacts, but are mostly used as an independent assembly, the so-called AFD block, with another protective device, for example a circuit breaker (so-called circuit breaker ) or a combined line / residual current circuit breaker (so-called FI / LS switch). This combination of the two devices then forms the AFDD protective switching device. In low-voltage electrical installation technology, such protective switchgear - i.e.
  • Miniature circuit breakers, residual current circuit breakers or combination devices such as FI / LS or AFDD - also referred to as "DIN rail mounted devices". This term stems from the fact that a multiplicity of such modular installation devices are often arranged next to one another “in a row” in an electrical installation distributor.
  • the fire protection switch When a fire protection switch is combined with the additional protective switching device, on the one hand an electrical connection of the two devices is required in order to implement a common supply.
  • the fire protection switch generally already has electrical connecting means which are led out of the housing of the fire protection switch in order to be connected in an electrically conductive manner to the connection terminals of the further protective switching device.
  • the fire protection switch also has a mechanical coupling to the further protective switching device in order to transmit a trigger signal generated on the basis of a detected fault current from the fire protection switch to the further protective switching device.
  • the trigger signal is consequently sent to the further protective switching device - for example, a line circuit breaker or a combined line circuit breaker / residual current circuit breaker - which then causes the circuit to be monitored to be interrupted by opening its switch contacts.
  • the additional protective switching device is only switched on again when the cause of the triggering of the fire protection switch has been eliminated in order to effectively and permanently avoid the continued danger to bystanders from electric shock or possible material damage due to a cable fire.
  • the fire protection switch according to the invention for detecting a predefined fault current has a housing, a display device of the type described above, which is accommodated and held in the housing, and a coupling element which - formed in a side wall of the housing - is provided for coupling the fire protection switch to a further protective switching device is on.
  • the coupling element is coupled to the trigger plunger of the display device such that when the trigger plunger moves into its triggered position, a trigger signal can be transmitted by means of the coupling element to the further protective switching device coupled to the fire protection switch.
  • the trigger signal of the fire protection switch can be transmitted to a protective switching device coupled to the fire protection switch, which is due to the received trigger signal interrupts the circuit to be monitored.
  • the fire protection switch therefore does not need its own isolating contacts to interrupt the circuit to be monitored.
  • the trigger plunger is moved into its triggered position, the movement of the display element into its second position is also released.
  • the further protective switching device coupled to the fire protection switch can only be switched on again when the trigger plunger has been returned to its ready-to-trigger position. However, since this reset is blocked by the display element in its second position, manual intervention by an operator is required, which manually resets the display element and thus returns the fire protection switch to its initial state ready for triggering.
  • the display device has a triggering device, which in turn has a triggering coil and a triggering plunger that is movably mounted relative to it, which can be moved from a ready-to-trigger position to a triggered position by energizing the triggering coil.
  • the display device has a display element which can be moved from a first position to a second position when the fire protection switch is triggered.
  • the indicator plunger is in its first position by the trigger plunger in the ready-to-trigger position, while it can be released by moving the trigger plunger into its triggered position. Resetting the trip plunger from its released position to its ready to trip Position is blocked by the display element in its second position.
  • the display element can be moved into a third position, whereby the fire protection switch can be reset to a ready-to-trigger state, the first position of the display element being between the second position and the third position.
  • the fire protection switch has a micro pushbutton which can be actuated by moving the display element into its third position, as a result of which the fire protection switch is reset to a ready-to-trigger state.
  • the first position of the display element indicates to an operator that the fire protection switch is ready to trigger, whereas the display element in the second position signals that the fire protection switch has tripped due to a predefined fault state, for example a detected arcing fault.
  • a predefined fault state for example a detected arcing fault.
  • the trigger plunger is moved from its ready-to-trigger position to its triggered position.
  • the fire protection switch then remains in this triggered state until the trigger plunger has been reset from its triggered position to its ready-to-trigger position.
  • the display element must first be returned to its first position, since in its second position it blocks the reset of the trigger plunger.
  • the display element can only be reset to its first position by manual intervention by the operator, it is ensured that an automatic restart - for example by a further protective switching device coupled to the fire protection switch - is effectively prevented.
  • the micro switch or switch is actuated by manually moving the display element into its third position, as a result of which the fire protection switch is reset to its ready-to-trigger initial state.
  • This reset corresponds to a RESET function of the fire protection switch, which cannot be initiated automatically, but must be carried out manually. This improves the safety of the electrical installation. This ensures that the RESET cannot be carried out automatically, but must be done manually.
  • the display element is L-shaped and has a shaft oriented in a direction of movement of the display element with a foot oriented transversely to the direction of movement.
  • the base of the display element with the trigger plunger forms an undercut in the position ready for triggering, which prevents movement of the display element from its first position to its second position.
  • the foot is released, the foot blocking the resetting of the trigger plunger from its triggered position to its ready-to-trigger position in the second position of the display element.
  • An undercut of the two movable construction elements of the display device - trigger plunger and display element - represents a common design feature in order to realize a mutual blocking or releasing of the two construction elements in their respective positions or positions in a simple and robust manner.
  • the display element is coupled to a spring element which urges the display element from the first position to the second position.
  • a spring element is a structurally simple possibility to exert a permanently acting force on the display element, which forces the display element into its second position. In this way, a simple, robust and inexpensive design of the display device is made possible.
  • the display element is designed as a light guide for transmitting a light signal.
  • the state of the fire protection switch can be signaled not only via the position of the display element, but also visually of a color signal.
  • the respective state of the fire protection switch can also be detected optically by a corresponding coloring - and thus faster.
  • the triggered state of the fire protection switch can be detected more quickly by the operator, which further improves the safety of the electrical installation.
  • the light signal can be generated by means of a multicolor LED or by means of a plurality of individual LEDs in order to optically signal different states of the fire protection switch by means of a different color.
  • the coupling element has a spring element which counteracts the movement of the coupling element initiated by the triggering element.
  • a spring element, which pushes the coupling element back into its initial position, represents a simple and inexpensive way of realizing a reset function of the coupling element.
  • the coupling element is mounted as a rotatable driver in the side wall of the fire protection switch.
  • the design of the coupling element as a rotatably mounted driver is a structurally simple one, in particular in the case of a bidirectional signal transmission between the fire protection switch and the further protective switching device and inexpensive way to implement signal transmission between the two protective switching devices.
  • FIGs 1A and 1B The fire protection switch 1 according to the invention is shown schematically in a first operating state ready for triggering.
  • Figure 1A here is a perspective external view of the fire protection switch 1 according to the invention with the housing 2 closed, while in Figure 1B a detailed view of the open fire switch housing 2 is shown with the display device arranged therein.
  • the fire protection switch 1 has a housing 2, which in turn has a front side 3, a fastening side 4 opposite the front side 3, and narrow sides 5 and wide sides 6 connecting the front side 3 and the fastening side 4.
  • the attachment side 4 is used for attachment of the fire protection switch 1 on a mounting rail or top-hat rail (not shown), as used, for example, in an electrical distribution board for fastening a plurality of modular devices.
  • the fire protection switch 1 has a display element 10, which is arranged in the interior of the housing 2, but is visible through an opening formed in the front 3 of the housing 2, in order to signal the triggering of the fire protection switch 1 in the event of a trigger. This signaling can take place both by a mechanical movement of the trigger element 10 and by an additional optical identification.
  • FIG. 1B shows the opened fire protection switch housing 2 with the display device arranged therein, the fire protection switch 1 being in a first, ready-to-operate operating state.
  • the fire protection switch 1 has a tripping device 20 which in turn has a tripping coil 21 and a tripping plunger 22 which is movably mounted in a first direction x relative to it.
  • the trigger plunger 22 is in a position ready for triggering and is energized into the triggered position by energizing the trigger coil 21 (see Figure 2B ) transferable.
  • the display element 10 is in principle in a second direction y, which is oriented transversely - in particular orthogonally - to the first direction x, relative to the housing 2 between a first, in Figure 1B position shown, and one in Figure 2B shown second position, slidably mounted.
  • the display element 10 essentially consists of an elongated shaft 11, which extends in the second direction y, and a foot 12, which is formed at a lower end of the shaft 11 and which projects beyond the shaft 11 in the first direction x.
  • the foot 12 can be integrally formed on the shaft 11, so that the display element 10 is formed in one piece.
  • the fire protection switch 1 has a microswitch 40 fastened in the interior of the housing 2, which is designed as a microswitch and by moving the display element 10 into a third position (see FIG. Figure 3 ) can be actuated.
  • the display element 10 is pressed a little into the housing 2 of the fire protection switch 1 by hand or with the aid of a tool in the opposite direction y until the foot 12 or the shaft 11 of the display element 10 touches the microswitch 40 and is thus actuated.
  • a RESET function of the fire protection switch 1 can be initiated, by means of which the fire protection switch 1 is reset to its initial state ready for triggering.
  • the fire protection switch 1 has an LED 30, which is arranged in the interior of the housing 2 below the shaft 11 of the display element 10. If the display element 10 is designed as a light guide for transmitting a light signal, this LED 30 can be used to generate an optical signal in addition to the mechanical change in position of the display element 10, which signals to an operator that the fire protection switch 1 has been triggered due to a fault current detected by it , If the LED 30 is also designed as a multicolor LED, several different operating states of the fire protection switch 1 can also be displayed by means of a correspondingly differentiated coloring.
  • the fire protection switch 1 In order to transmit the trigger signal to a further protective switching device coupled to the fire protection switch 1, for example a circuit breaker (circuit breaker) or a combined circuit breaker / residual current circuit breaker (circuit breaker / FI switch), the fire protection switch 1 has a coupling element 50 which is arranged in a the broad sides 6 of the housing 2 is rotatably supported.
  • the coupling element 50 has an operative connection to the trigger plunger 22 such that the coupling element 50 to one in the event of the fire protection switch being triggered by the trigger plunger 22 Rotational movement is initiated. This rotary movement is transmitted to the further protective switching device coupled to the fire protection switch 1 and has the effect that this is also triggered, as a result of which the electrical line to be monitored is interrupted.
  • a return spring 51 is provided, which is designed as a torsion spring, acts on the coupling element 50 and is supported on the housing 2.
  • the display element 10 assumes a first position in which the foot 12 of the display element 10 forms an undercut with the trigger plunger 22 of the trigger device 20.
  • trigger-ready operating state of the fire protection switch 1 - a movement of the display element 10 from the in Figure 1B illustrated first position in its in Figure 2B second position shown inhibited.
  • the trigger plunger 22 is in its ready-to-trigger position, moving the display element 10 into its second position, which signals to an operator that the fire protection switch 1 has been triggered, due to the undercut of the right end of the trigger plunger 22 with the foot 12 of the display element 10, effectively prevented.
  • FIGS. 2A and 2B schematically show the fire protection switch 1 according to the invention in a second operating state, in which the fire protection switch 1 has already triggered due to a detected fault current.
  • the display element 10 is in its second position and protrudes with its upper end beyond the outer contour of the front side 3 of the fire protection switch housing 2.
  • Figure 2A here again shows an external perspective view of the triggered fire protection switch 1 with the housing 2 closed, while in Figure 2B the associated detailed representation of the open fire protection switch housing 2 is shown with the display device arranged therein, the fire protection switch 1 is in a second, triggered operating state.
  • the trigger coil 21 was energized by a trigger signal based on a detected fault current, as a result of which the trigger plunger 22 was brought into its second, triggered position by means of a movement in the first direction x.
  • the fire protection switch In order to switch the additional protective switching device on again, the fire protection switch must therefore first be reset to its triggerable operating state by manually actuating the display element 10 before the circuit to be monitored is closed again by switching on the additional protective switching device becomes. This ensures that an operator must first register the triggering of the fire protection switch 1 and actively acknowledge it. An automatic restart by closing the circuit to be monitored is effectively prevented.
  • the fire protection switch is shown schematically in a third operating state in which the display element 10 assumes its third position.
  • the display element 10 In order to move the display element 10 into its third position, it is pushed a little by hand or with the aid of a tool against the second direction y into the housing 2 of the fire protection switch 1 until the foot 12 or the shaft 11 of the display element 10 pushes the microswitch 40 touched and actuated. This can be done both from the second position and from the first position of the display element 10.
  • a RESET function is then initiated, which resets the fire protection switch 1 to its ready-to-trigger initial state.

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  • Electromagnetism (AREA)
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  • Indication Of The Valve Opening Or Closing Status (AREA)

Description

Die Erfindung betrifft eine Anzeigevorrichtung für einen Brandschutzschalter sowie einen Brandschutzschalter zur Erfassung eines Störlichtbogens.The invention relates to a display device for a fire protection switch and a fire protection switch for detecting an arcing fault.

In der Elektroinstallationstechnik wird unter dem Begriff "Brandschutzschalter" eine Schutzeinrichtung zum Schutz vor einem durch einen Störlichtbögen hervorgerufenen Fehlerstrom verstanden. Derartige Störlichtbogen-Schutzeinrichtungen werden in Niederspannungsnetzen eingesetzt, um die elektrische Installationstechnik vor Beschädigung durch einen Fehlerstrom aufgrund eines Störlichtbogens sowie dessen thermischen Folgen - beispielsweise Kabelbränden - zu schützen.In electrical installation technology, the term "fire protection switch" is understood to mean a protective device for protection against a fault current caused by an arcing fault. Arc fault protection devices of this type are used in low-voltage networks in order to protect the electrical installation technology against damage from a fault current due to an arc fault and its thermal consequences, for example cable fires.

Ein Störlichtbogen kann beispielsweise an einer defekten Stelle einer elektrischen Leitung, z.B. eine lockeren Kabelklemme, oder aufgrund eines Kabelbruchs auftreten. Tritt der Störlichtbogen elektrisch in Reihe zu einem elektrischen Verbraucher auf, so wird der normale Betriebsstrom im Regelfall nicht überschritten, da er durch den Verbraucher begrenzt wird. Aus diesem Grund wird der Störlichtbogen von einer herkömmlichen Überstromschutzeinrichtung, beispielsweise einer Schmelzsicherung oder eines Leitungsschutzschalters, nicht erfasst. Dies ist insbesondere bei hohen Betriebsströmen sowie bei über längere Zeit bestehenden Störlichtbögen problematisch, da in diesen Fällen aufgrund der mit dem Lichtbogen einhergehenden hohen Temperaturen die Gefahr eines Brandes besteht.An arcing fault can occur, for example, at a defective point on an electrical line, e.g. a loose cable clamp or due to a cable break. If the arcing occurs electrically in series with an electrical consumer, the normal operating current is generally not exceeded, since it is limited by the consumer. For this reason, the arcing fault is not detected by a conventional overcurrent protection device, for example a fuse or a circuit breaker. This is particularly problematic in the case of high operating currents and in the event of arcing faults which exist for a long time, since in these cases there is a risk of fire due to the high temperatures associated with the arcing.

Zur Ermittlung, ob ein Störlichtbogen vorliegt, werden durch den Brandschutzschalter sowohl der Spannungsverlauf als auch der Stromverlauf über die Zeit gemessen und mittels digitaler Signalverarbeitung ausgewertet. Insbesondere der Stromverlauf weist bei einem Störlichtbogen charakteristische, hochfrequente Anteile auf. Bei der Auswertung ist jedoch zu beachten, dass reguläre Schwankungen im Stromverlauf sowie im normalen Betrieb auftretende Oberschwingungen oder transiente Stromverläufe, wie sie bei einem Einschaltvorgang eines Verbrauchers auftreten, nicht zu einer fehlerhaften Auslösung des Brandschutzschalters führen. Aus diesem Grund weisen Brandschutzschalter relativ komplexe Algorithmen zur Überwachung der Elektroinstallation sowie zum Detektieren möglicher Störlichtbögen auf.To determine whether there is an arcing fault, both the voltage curve and the current curve are measured over time by the fire protection switch and evaluated using digital signal processing. In the case of an arcing fault, the current profile in particular has characteristic, high-frequency Shares on. When evaluating, however, it should be noted that regular fluctuations in the current profile as well as harmonics occurring during normal operation or transient current profiles, such as occur when a consumer is switched on, do not lead to an incorrect triggering of the fire protection switch. For this reason, fire protection switches have relatively complex algorithms for monitoring the electrical installation and for detecting possible arcing faults.

In der (englischsprachigen) Fachliteratur werden derartige Einrichtungen zur Erfassung von Störlichtbögen als "Arc Fault Detection Device" (abgekürzt AFDD) bezeichnet. Im nordamerikanischen Raum, wo der sogenannte UL-Standard (Underwriters laboratories, Norm mit 110 V Netzspannung) vorherrscht, ist die Bezeichnung "Arc Fault Circuit Interrupter" (abgekürzt AFCI) geläufig. In den Vereinigten Staaten sind Lichtbogenschutzschalter sogar zwingend vorgeschrieben, um anhand vorbestimmter Kriterien zu erfassen, ob möglicherweise ein Lichtbogen in einem Stromkreis vorliegt. Die dort verwendeten Lichtbogenschutzschalter weisen hierzu einen eigenen Trennkontakt auf, der im Falle des Vorliegens eines Lichtbogens geöffnet wird. Die in diesen Lichtbogenschutzschaltern verwendeten Prinzipien sind beispielsweise in den US-Patentschriften US 5,729,145 sowie US 6,031,699 beschrieben. Aus den US 2003/151478 A1 , US 2009/184787 A1 , US 2010/020453 A1 , EP 1 628 317 A2 , US 3 321 597 A , US 2004/095696 A1 und CN 103 915 297 B sind unterschiedliche Leistungsschalter mit Anzeigevorrichtungen bekannt.In the (English-language) specialist literature, such devices for detecting arcing faults are referred to as "Arc Fault Detection Devices" (abbreviated AFDD). In North America, where the so-called UL standard (Underwriters laboratories, norm with 110 V mains voltage) prevails, the term "Arc Fault Circuit Interrupter" (abbreviated AFCI) is common. In the United States, arc breakers are even mandatory to use predetermined criteria to determine whether there is an arc in a circuit. For this purpose, the arc protection switches used there have their own isolating contact, which is opened in the event of an arc. The principles used in these arc protection switches are, for example, in the US patents US 5,729,145 such as US 6,031,699 described. From the US 2003/151478 A1 . US 2009/184787 A1 . US 2010/020453 A1 . EP 1 628 317 A2 . US 3,321,597 A. . US 2004/095696 A1 and CN 103 915 297 B different circuit breakers with display devices are known.

In den meisten europäischen Ländern, welche den IEC-Standard (International Electrotechnical Commission, Norm mit einer Netzspannung von 230 V) verbindlich vorschreiben, sind Lichtbogenschutzschalter nicht zwingend erforderlich. Stromkreise in IEC-Technik werden bis dato zumeist mit Hilfe von Fehlerschutzstromschaltern sowie Leitungsschutzschaltern abgesichert. Ein Schutz vor Störlichtbögen ist mit den genannten Schutzschaltgeräten jedoch nicht realisierbar.In most European countries, which make the IEC standard (International Electrotechnical Commission, standard with a mains voltage of 230 V) mandatory, arc protection switches are not absolutely necessary. To date, circuits in IEC technology have mostly been protected with the help of fault current switches and miniature circuit breakers. Protection against accidental arcing cannot, however, be achieved with the protective switching devices mentioned.

Um dennoch einen wirksamen Schutz vor Störlichtbögen zu realisieren, werden auch hierzulande vermehrt Schutzschalter gegen Störlichtbögen, sog. Brandschutzschalter, eingesetzt. Im Gegensatz zu den auf dem US-Markt erhältlichen Modellen verfügen diese Brandschutzschalter jedoch in der Regel über keine eigenen Trennkontakte, sondern werden zumeist als eigenständige Baugruppe, dem sogenannten AFD-Block, mit einer weiteren Schutzeinrichtung, beispielsweise einem Leitungsschutzschalter (sog. LS-Schalter) oder einem kombinierten Leitungsschutz-/Fehlerstromschutzschalter (sog. FI/LS-Schalter), kombiniert. Diese Kombination der beiden Geräte bildet dann das Schutzschaltgerät AFDD. In der Niederspannungs- Elektroinstallationstechnik werden derartige Schutzschaltgeräte - d.h. Leitungsschutzschalter, Fehlerstromschutzschalter oder Kombigeräte wie FI/LS oder AFDD - auch als "Reiheneinbaugeräte" bezeichnet. Dieser Begriff rührt daher, dass in einem Elektroinstallationsverteiler oftmals eine Vielzahl derartiger Reiheneinbaugeräte nebeneinander "in einer Reihe" angeordnet ist.In order to nevertheless provide effective protection against arcing faults, protective switches against arcing faults, so-called fire protection switches, are also increasingly being used in Germany. In contrast to the models available on the US market, these fire protection switches generally do not have their own isolating contacts, but are mostly used as an independent assembly, the so-called AFD block, with another protective device, for example a circuit breaker (so-called circuit breaker ) or a combined line / residual current circuit breaker (so-called FI / LS switch). This combination of the two devices then forms the AFDD protective switching device. In low-voltage electrical installation technology, such protective switchgear - i.e. Miniature circuit breakers, residual current circuit breakers or combination devices such as FI / LS or AFDD - also referred to as "DIN rail mounted devices". This term stems from the fact that a multiplicity of such modular installation devices are often arranged next to one another “in a row” in an electrical installation distributor.

Bei der Kombination eines Brandschutzschalters mit dem weiteren Schutzschaltgerät ist zum Einen eine elektrische Verbindung der beiden Geräte erforderlich, um eine gemeinsame Einspeisung zu realisieren. Hierzu weist der Brandschutzschalter in der Regel bereits elektrische Verbindungsmittel auf, welche aus dem Gehäuse des Brandschutzschalters herausgeführt sind, um mit den Anschlussklemmen des weiteren Schutzschaltgerätes elektrisch leitend verbunden zu werden. Zum Anderen weist der Brandschutzschalter auch eine mechanische Kopplung mit dem weiteren Schutzschaltgerät auf, um ein auf Basis eines detektierten Fehlerstroms generiertes Auslösesignal von dem Brandschutzschalter an das weitere Schutzschaltgerät zu übertragen. Beim Auslösen des Brandschutzschalters wird das Auslösesignal folglich an das weitere Schutzschaltgerät - beispielsweise einem Leitungsschutzschalter oder einem kombinierten Leitungsschutz-/Fehlerstromschutzschalter - übertragen, welches dann durch Öffnen seiner Schaltkontakte eine Unterbrechung des zu überwachenden Stromkreises bewirkt. Hierbei ist jedoch zu beachten, dass das weitere Schutzschaltgerät erst dann wieder eingeschaltet wird, wenn die Ursache für das Auslösen des Brandschutzschalters beseitigt ist, um eine fortdauernde Gefährdung umstehender Personen vor elektrischem Schlag oder eines möglichen Sachschadens aufgrund eines Kabelbrandes - wirksam und dauerhaft zu vermeiden.When a fire protection switch is combined with the additional protective switching device, on the one hand an electrical connection of the two devices is required in order to implement a common supply. For this purpose, the fire protection switch generally already has electrical connecting means which are led out of the housing of the fire protection switch in order to be connected in an electrically conductive manner to the connection terminals of the further protective switching device. On the other hand, the fire protection switch also has a mechanical coupling to the further protective switching device in order to transmit a trigger signal generated on the basis of a detected fault current from the fire protection switch to the further protective switching device. When the fire protection switch is triggered, the trigger signal is consequently sent to the further protective switching device - for example, a line circuit breaker or a combined line circuit breaker / residual current circuit breaker - which then causes the circuit to be monitored to be interrupted by opening its switch contacts. However, it should be noted here that the additional protective switching device is only switched on again when the cause of the triggering of the fire protection switch has been eliminated in order to effectively and permanently avoid the continued danger to bystanders from electric shock or possible material damage due to a cable fire.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, einen Brandschutzschalter zur Erfassung eines Störlichtbogens bereitzustellen, welcher sich durch eine verbesserte Sicherheit auszeichnet.It is therefore the object of the present invention to provide a fire protection switch for detecting an arcing fault, which is characterized by improved safety.

Diese Aufgabe wird durch den Brandschutzschalter gemäß dem unabhängigen Anspruch gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der abhängigen Ansprüche.This task is solved by the fire protection switch according to the independent claim. Advantageous refinements are the subject of the dependent claims.

Der erfindungsgemäße Brandschutzschalter zur Erfassung eines vordefinierten Fehlerstroms weist ein Gehäuse, eine Anzeigevorrichtung der vorstehend beschriebenen Art, welche in dem Gehäuse aufgenommen und gehaltert ist, sowie ein Koppelelement, welches - in einer Seitenwand des Gehäuses ausgebildet - zur Kopplung des Brandschutzschalters mit einem weiteren Schutzschaltgerät vorgesehen ist, auf. Das Koppelelement ist dabei derart mit dem Auslösestößel der Anzeigevorrichtung gekoppelt, dass bei einer Bewegung des Auslösestößels in seine ausgelöste Stellung ein Auslösesignal mittels des Koppelelements an das mit dem Brandschutzschalter gekoppelte weitere Schutzschaltgerät übertragbar ist.The fire protection switch according to the invention for detecting a predefined fault current has a housing, a display device of the type described above, which is accommodated and held in the housing, and a coupling element which - formed in a side wall of the housing - is provided for coupling the fire protection switch to a further protective switching device is on. The coupling element is coupled to the trigger plunger of the display device such that when the trigger plunger moves into its triggered position, a trigger signal can be transmitted by means of the coupling element to the further protective switching device coupled to the fire protection switch.

Mit Hilfe des in der Seitenwand des Brandschutzschaltergehäuses ausgebildeten Koppelelements ist das Auslösesignal des Brandschutzschalters an ein mit dem Brandschutzschalter gekoppeltes Schutzschaltgerät übertragbar, welches aufgrund des empfangenen Auslösesignals den zu überwachenden Stromkreis unterbricht. Der Brandschutzschalter benötigt daher keine eigenen Trennkontakte zur Unterbrechung des zu überwachenden Stromkreises. Mit dem Bewegen des Auslösestößels in seine ausgelöste Stellung wird auch die Bewegung des Anzeigeelements in seine zweite Position freigegeben. Ein Wiedereinschalten des mit dem Brandschutzschalter gekoppelten weiteren Schutzschaltgerätes ist erst möglich, wenn der Auslösestößel wieder in seine auslösebereite Stellung zurückgestellt worden ist. Da dieses Zurückstellen jedoch durch das Anzeigeelement in seiner zweiten Position blockiert wird, ist zunächst ein manueller Eingriff einer Bedienperson erforderlich, welche das Auszeigeelement manuell zurückstellt und damit den Brandschutzschalter wieder in seinen auslösebereiten Ausgangszustand zurückversetzt. Auf diese Weise wird ein automatisches Wiedereinschalten - sowohl des Brandschutzschalters als auch des mit dem Brandschutzschalter gekoppelten weiteren Schutzschaltgerätes - wirksam verhindert. Somit ist gewährleistet, dass zunächst eine Bedienperson die Auslösung des Brandschutzschalters registrieren und aktiv - durch das manuelle Zurückstellen des Anzeigeelements - quittieren muss, bevor der zu überwachende Stromkreis wieder geschlossen wird. Fehlbedienungen können somit wirksam unterbunden werden, wodurch die Sicherheit der Elektroinstallation deutlich verbessert wird. Die Anzeigevorrichtung weist eine Auslöseeinrichtung auf, welche ihrerseits eine Auslösespule sowie einen relativ dazu beweglich gelagerten Auslösestößel aufweist, der durch Bestromen der Auslösespule von einer auslösebereiten Stellung in eine ausgelöste Stellung verbringbar ist. Weiterhin weist die Anzeigevorrichtung ein Anzeigeelement auf, welches bei einer Auslösung des Brandschutzschalters von einer ersten Position in eine zweite Position bewegbar ist. Durch den sich in der auslösebereiten Stellung befindlichen Auslösestößel ist das Anzeigeelement in seiner ersten Position gehalten, während es durch ein Verbringen des Auslösestößels in seine ausgelöste Stellung freigebbar ist. Ein Zurückstellen des Auslösestößels von seiner ausgelösten Stellung in seine auslösebereite Stellung ist durch das Anzeigeelement in seiner zweiten Position blockiert. Das Anzeigeelement ist in eine dritte Position bewegbar, wodurch ein Zurücksetzen des Brandschutzschalters in einen auslösebereiten Zustand bewirkbar ist, wobei die erste Position des Anzeigeelements zwischen der zweiten Position und der dritte Position liegt. Der Brandschutzschalter weist einen Mikrotaster auf, welcher durch ein Bewegen des Anzeigeelements in seine dritte Position betätigbar ist, wodurch ein Zurücksetzen des Brandschutzschalters in einen auslösebereiten Zustand bewirkt wird.With the help of the coupling element formed in the side wall of the fire protection switch housing, the trigger signal of the fire protection switch can be transmitted to a protective switching device coupled to the fire protection switch, which is due to the received trigger signal interrupts the circuit to be monitored. The fire protection switch therefore does not need its own isolating contacts to interrupt the circuit to be monitored. When the trigger plunger is moved into its triggered position, the movement of the display element into its second position is also released. The further protective switching device coupled to the fire protection switch can only be switched on again when the trigger plunger has been returned to its ready-to-trigger position. However, since this reset is blocked by the display element in its second position, manual intervention by an operator is required, which manually resets the display element and thus returns the fire protection switch to its initial state ready for triggering. In this way, automatic restarting - both of the fire protection switch and of the further protection switching device coupled to the fire protection switch - is effectively prevented. This ensures that an operator must first register the triggering of the fire protection switch and actively acknowledge - by manually resetting the display element - before the circuit to be monitored is closed again. Incorrect operation can thus be effectively prevented, which significantly improves the safety of the electrical installation. The display device has a triggering device, which in turn has a triggering coil and a triggering plunger that is movably mounted relative to it, which can be moved from a ready-to-trigger position to a triggered position by energizing the triggering coil. Furthermore, the display device has a display element which can be moved from a first position to a second position when the fire protection switch is triggered. The indicator plunger is in its first position by the trigger plunger in the ready-to-trigger position, while it can be released by moving the trigger plunger into its triggered position. Resetting the trip plunger from its released position to its ready to trip Position is blocked by the display element in its second position. The display element can be moved into a third position, whereby the fire protection switch can be reset to a ready-to-trigger state, the first position of the display element being between the second position and the third position. The fire protection switch has a micro pushbutton which can be actuated by moving the display element into its third position, as a result of which the fire protection switch is reset to a ready-to-trigger state.

Durch die erste Position des Anzeigeelements wird einer Bedienperson ein auslösebereiter Zustand des Brandschutzschalters angezeigt, wohingegen durch das Anzeigeelement in der zweiten Position eine erfolgte Auslösung des Brandschutzschalters aufgrund eines vordefinierten Fehlerzustands, beispielsweise eines detektierten Störlichtbogens, signalisiert wird. Bei einer Auslösung des Brandschutzschalters wird der Auslösestößel von seiner auslösebereiten Stellung in seine ausgelöste Stellung verbracht. Anschließend verbleibt der Brandschutzschalter so lange in diesem ausgelösten Zustand, bis der Auslösestößel von seiner ausgelösten Stellung in seine auslösebereite Stellung zurückgestellt worden ist. Um den Auslösestößel jedoch in seine auslösebereite Stellung zurückstellen zu können, muss zunächst das Anzeigeelement in seine erste Position zurückverbracht werden, da dieses in seiner zweiten Position das Zurückstellen des Auslösestößels blockiert. Da jedoch das Zurückstellen des Anzeigeelements in seine erste Position nur durch einen manuellen Eingriff der Bedienperson möglich ist, ist sichergestellt, dass ein automatisches Wiedereinschalten - beispielsweise durch ein mit dem Brandschutzschalter gekoppeltes weiteres Schutzschaltgerät - wirksam verhindert wird.The first position of the display element indicates to an operator that the fire protection switch is ready to trigger, whereas the display element in the second position signals that the fire protection switch has tripped due to a predefined fault state, for example a detected arcing fault. When the fire protection switch is triggered, the trigger plunger is moved from its ready-to-trigger position to its triggered position. The fire protection switch then remains in this triggered state until the trigger plunger has been reset from its triggered position to its ready-to-trigger position. However, in order to be able to return the trigger plunger to its ready-to-trigger position, the display element must first be returned to its first position, since in its second position it blocks the reset of the trigger plunger. However, since the display element can only be reset to its first position by manual intervention by the operator, it is ensured that an automatic restart - for example by a further protective switching device coupled to the fire protection switch - is effectively prevented.

Auf diese Weise ist gewährleistet, dass zunächst eine Bedienperson die Auslösung des Brandschutzschalters registrieren und aktiv quittieren muss, bevor der zu überwachende Stromkreis wieder geschlossen wird. Fehlbedienungen - beispielsweise ein Wiedereinschalten des Brandschutzschalters und/oder des weiteren Schutzschaltgerätes bei nicht behobener, und damit noch bestehender Fehlerursache - können somit wirksam unterbunden werden, wodurch die Sicherheit der Elektroinstallation, sowie möglicherweise sich in der Nähe befindlicher Personen, deutlich verbessert wird.This ensures that an operator must first register the activation of the fire protection switch and actively acknowledge it before the circuit to be monitored is closed again. Incorrect operation - for example, switching the fire protection switch and / or the additional protective switching device back on if the cause of the fault has not been rectified and therefore still exists - can thus be effectively prevented, which significantly improves the safety of the electrical installation and any persons in the vicinity.

Durch ein manuelles Bewegen des Anzeigeelements in seine dritte Position wird der Mikrotaster oder -schalter betätigt, wodurch der Brandschutzschalter in seinen auslösebereiten Ausgangszustand zurückversetzt wird. Dieses Zurücksetzen entspricht einer RESET-Funktion des Brandschutzschalters, welche nicht automatisiert initiierbar ist, sondern zwingend manuell erfolgen muss. Die Sicherheit der Elektroinstallation wird hierdurch verbessert. Auf diese Weise ist sichergestellt, dass der RESET nicht automatisiert ausgeführt werden kann, sondern manuell erfolgen muss.The micro switch or switch is actuated by manually moving the display element into its third position, as a result of which the fire protection switch is reset to its ready-to-trigger initial state. This reset corresponds to a RESET function of the fire protection switch, which cannot be initiated automatically, but must be carried out manually. This improves the safety of the electrical installation. This ensures that the RESET cannot be carried out automatically, but must be done manually.

Zu den in dieser Anmeldung verwendeten Begriffe sein an dieser Stelle angemerkt, dass hinsichtlich des Brandschutzschalters sowie der Anzeigevorrichtung der Begriff "Betriebszustand" Verwendung findet, während hinsichtlich des Auslösestößels der Begriff "Stellung" - auslösebereite Stellung sowie ausgelöste Stellung, hinsichtlich des Anzeigeelements hingegen der Begriff "Position" - erste Position, zweite Position bzw. dritte Position, verwendet werden.Regarding the terms used in this application, it should be noted at this point that the term "operating state" is used with regard to the fire protection switch and the display device, while the term "position" - ready-to-release position and triggered position, with respect to the trigger plunger, but the term with respect to the display element "Position" - first position, second position or third position can be used.

In einer vorteilhaften Weiterbildung der Anzeigevorrichtung ist das Anzeigeelement L-förmig ausgebildet und weist einen in einer Bewegungsrichtung des Anzeigeelements orientierten Schaft mit einem quer zur Bewegungsrichtung orientierten Fuß auf. Mit Hilfe des L-förmig geformten Anzeigeelements kann auf einfache Art und Weise sowohl ein Blockieren des Anzeigeelements in seiner ersten Position durch den sich in der auslosebereiten Stellung befindlichen Auslösestößel, als auch ein Blockieren des sich in der ausgelösten Stellung befindlichen Auslösestößels durch das sich in der zweiten Position befindliche Anzeigeelement mittels einer einfachen und robusten Konstruktion realisiert werden.In an advantageous development of the display device, the display element is L-shaped and has a shaft oriented in a direction of movement of the display element with a foot oriented transversely to the direction of movement. With the help of the L-shaped display element, both a blocking of the display element in its first position by the release plunger in the ready-to-release position and a blocking of the one in the released position can be done in a simple manner Trigger plunger can be realized by the display element in the second position by means of a simple and robust construction.

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters bildet der Fuß des Anzeigeelements mit dem Auslösestößel in der auslösebereiten Stellung eine Hinterschneidung, welche eine Bewegung des Anzeigeelements von seiner ersten Position in seine zweite Position verhindert. In der ausgelösten Stellung des Auslösestößels ist der Fuß hingegen freigegeben, wobei der Fuß in der zweiten Position des Anzeigeelements ein Zurückstellen des Auslösestößels von seiner ausgelösten Stellung in seine auslösebereite Stellung blockiert. Eine Hinterschneidung der beiden beweglichen Konstruktionselemente der Anzeigevorrichtung - Auslösestößel und Anzeigeelement - stellt dabei ein gängiges konstruktives Gestaltungsmerkmal dar, um ein wechselseitiges Blockieren bzw. Freigeben der beiden Konstruktionselemente in ihren jeweiligen Stellungen bzw. Positionen auf einfache und robuste Art und Weise zu realisieren.In a further advantageous development of the fire protection switch, the base of the display element with the trigger plunger forms an undercut in the position ready for triggering, which prevents movement of the display element from its first position to its second position. In contrast, in the triggered position of the trigger plunger, the foot is released, the foot blocking the resetting of the trigger plunger from its triggered position to its ready-to-trigger position in the second position of the display element. An undercut of the two movable construction elements of the display device - trigger plunger and display element - represents a common design feature in order to realize a mutual blocking or releasing of the two construction elements in their respective positions or positions in a simple and robust manner.

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters ist das Anzeigeelement mit einem Federelement, welches das Anzeigeelement von der ersten Position in die zweite Position drängt, gekoppelt. Ein Federelement stellt eine konstruktiv einfache Möglichkeit dar, um eine permanent wirkende Kraft auf das Anzeigeelement auszuüben, welche das Anzeigeelement in seine zweite Position drängt. Auf diese Weise wird eine einfache, robuste und kostengünstige Gestaltung der Anzeigevorrichtung ermöglicht.In a further advantageous development of the fire protection switch, the display element is coupled to a spring element which urges the display element from the first position to the second position. A spring element is a structurally simple possibility to exert a permanently acting force on the display element, which forces the display element into its second position. In this way, a simple, robust and inexpensive design of the display device is made possible.

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters ist das Anzeigeelement als Lichtleiter zur Übertragung eines Lichtsignals ausgebildet. Durch die Verwendung eines Lichtleiters kann der Zustand des Brandschutzschalters nicht nur über die Position des Anzeigeelements signalisiert werden, sondern zusätzlich auch optisch mittels eines farblichen Signals. Auf dieser Weise ist der jeweilige Zustand des Brandschutzschalters auch optisch durch eine entsprechende Farbgebung - und damit schneller - erfassbar. Auf diese Weise kann der Ausgelöst-Zustand des Brandschutzschalters schneller durch die Bedienperson erfasst werden, wodurch die Sicherheit der Elektroinstallation weiter verbessert wird.In a further advantageous development of the fire protection switch, the display element is designed as a light guide for transmitting a light signal. By using an optical fiber, the state of the fire protection switch can be signaled not only via the position of the display element, but also visually of a color signal. In this way, the respective state of the fire protection switch can also be detected optically by a corresponding coloring - and thus faster. In this way, the triggered state of the fire protection switch can be detected more quickly by the operator, which further improves the safety of the electrical installation.

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters ist das Lichtsignal mittels einer Mehrfarben-LED oder mittels mehrerer Einzel-LEDs erzeugbar, um unterschiedliche Zustände des Brandschutzschalters optisch durch eine unterschiedliche Farbgebung zu signalisieren. Mit Hilfe einer Mehrfarben-LED - oder alternativ: mehrerer Einzel-LEDs unterschiedlicher Farbe - deren Lichtsignal in das als Lichtleiter ausgebildete Anzeigeelement eingekoppelt wird, ist eine - vom aktuellen Betriebszustand des Brandschutzschalters abhängige - zustandsspezifische Farbgebung des Anzeigeelements auf einfache und kostengünstige Art und Weise realisierbar.In a further advantageous development of the fire protection switch, the light signal can be generated by means of a multicolor LED or by means of a plurality of individual LEDs in order to optically signal different states of the fire protection switch by means of a different color. With the help of a multi-color LED - or alternatively: several individual LEDs of different colors - whose light signal is coupled into the display element designed as a light guide, a state-specific coloring of the display element - depending on the current operating state of the fire protection switch - can be implemented in a simple and cost-effective manner ,

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters weist das Koppelelement ein Federelement auf, welches der durch das Auslöseelement initiierten Bewegung des Koppelelements entgegenwirkt. Ein Federelement, welche das Koppelelement in seine Ausgangsstellung zurückdrängt, stellt eine einfache und kostengünstige Möglichkeit zur Realisierung einer Rückstellfunktion des Koppelelements dar.In a further advantageous development of the fire protection switch, the coupling element has a spring element which counteracts the movement of the coupling element initiated by the triggering element. A spring element, which pushes the coupling element back into its initial position, represents a simple and inexpensive way of realizing a reset function of the coupling element.

In einer weiteren vorteilhaften Weiterbildung des Brandschutzschalters ist das Koppelelement als drehbeweglicher Mitnehmer in der Seitenwand des Brandschutzschalters gelagert. Die Ausführung des Koppelelements als drehbeweglich gelagerter Mitnehmer stellt - insbesondere bei einer bidirektionalen Signalübertragung zwischen dem Brandschutzschalter und dem weiteren Schutzschaltgerät - eine konstruktiv einfache und kostengünstige Möglichkeit zur Realisierung der Signalübertragung zwischen den beiden Schutzschaltgeräten dar.In a further advantageous development of the fire protection switch, the coupling element is mounted as a rotatable driver in the side wall of the fire protection switch. The design of the coupling element as a rotatably mounted driver is a structurally simple one, in particular in the case of a bidirectional signal transmission between the fire protection switch and the further protective switching device and inexpensive way to implement signal transmission between the two protective switching devices.

Im Folgenden wird ein Ausführungsbeispiel des Brandschutzschalters unter Bezug auf die beigefügten Figuren näher erläutert. In den Figuren sind:

Figuren 1A und 1B
schematische Darstellungen des Brandschutzschalters in einem ersten Betriebszustand;
Figuren 2A und 2B
schematische Darstellungen des Brandschutzschalters in einem zweiten Betriebszustand;
Figur 3
eine schematische Darstellung des Brandschutzschalters in einem dritten Betriebszustand.
An exemplary embodiment of the fire protection switch is explained in more detail below with reference to the attached figures. In the figures are:
Figures 1A and 1B
schematic representations of the fire protection switch in a first operating state;
Figures 2A and 2B
schematic representations of the fire protection switch in a second operating state;
Figure 3
is a schematic representation of the fire protection switch in a third operating state.

In den verschiedenen Figuren der Zeichnung sind gleiche Teile stets mit dem gleichen Bezugszeichen versehen. Die Beschreibung gilt für alle Zeichnungsfiguren, in denen das entsprechende Teil ebenfalls zu erkennen ist.In the different figures of the drawing, the same parts are always provided with the same reference numerals. The description applies to all drawing figures in which the corresponding part can also be seen.

In den Figuren 1A und 1B ist der erfindungsgemäße Brandschutzschalter 1 in einem ersten, auslösebereiten Betriebszustand schematisch dargestellt. In Figur 1A ist hierbei eine perspektivische Außenansicht des erfindungsgemäßen Brandschutzschalters 1 bei geschlossenem Gehäuse 2 gezeigt, während in Figur 1B eine Detaildarstellung des geöffneten Brandschutzschaltergehäuses 2 mit der darin angeordneten Anzeigevorrichtung dargestellt ist.In the Figures 1A and 1B The fire protection switch 1 according to the invention is shown schematically in a first operating state ready for triggering. In Figure 1A here is a perspective external view of the fire protection switch 1 according to the invention with the housing 2 closed, while in Figure 1B a detailed view of the open fire switch housing 2 is shown with the display device arranged therein.

Der Brandschutzschalter 1 weist ein Gehäuse 2 auf, welches seinerseits eine Frontseite 3, eine der Frontseite 3 gegenüberliegende Befestigungsseite 4, sowie die Frontseite 3 und die Befestigungsseite 4 verbindende Schmalseiten 5 und Breitseiten 6 aufweist. Die Befestigungsseite 4 dient der Befestigung des Brandschutzschalters 1 an einer Trag- oder Hutschiene (nicht dargestellt), wie sie beispielsweise in einem Elektroinstallationsverteiler zur Befestigung einer Mehrzahl von Reiheneinbaugeräten eingesetzt werden. Weiterhin weist der Brandschutzschalter 1 ein Anzeigeelement 10 auf, welches im Inneren des Gehäuses 2 angeordnet, aber durch eine in der Frontseite 3 des Gehäuses 2 ausgebildete Öffnung sichtbar ist, um im Auslösefall die Auslösung des Brandschutzschalters 1 zu signalisieren. Diese Signalisierung kann sowohl durch eine mechanische Bewegung des Auslöseelements 10, als auch durch eine zusätzliche optische Kennzeichnung erfolgen.The fire protection switch 1 has a housing 2, which in turn has a front side 3, a fastening side 4 opposite the front side 3, and narrow sides 5 and wide sides 6 connecting the front side 3 and the fastening side 4. The attachment side 4 is used for attachment of the fire protection switch 1 on a mounting rail or top-hat rail (not shown), as used, for example, in an electrical distribution board for fastening a plurality of modular devices. Furthermore, the fire protection switch 1 has a display element 10, which is arranged in the interior of the housing 2, but is visible through an opening formed in the front 3 of the housing 2, in order to signal the triggering of the fire protection switch 1 in the event of a trigger. This signaling can take place both by a mechanical movement of the trigger element 10 and by an additional optical identification.

Figur 1B zeigt das geöffnete Brandschutzschaltergehäuses 2 mit der darin angeordneten Anzeigevorrichtung, wobei sich der Brandschutzschalter 1 in einem ersten, auslösebereiten Betriebszustand befindet. Der Brandschutzschalter 1 weist eine Auslöseeinrichtung 20 auf, welche ihrerseits eine Auslösespule 21 sowie einen - in einer ersten Richtung x - relativ dazu beweglich gelagerten Auslösestößel 22 aufweist. In der in Figur 1B gezeigten Darstellung befindet sich der Auslösestößel 22 in einer auslösebereiten Stellung und ist durch Bestromen der Auslösespule 21 in eine ausgelöste Stellung (siehe Figur 2B) verbringbar. Figure 1B shows the opened fire protection switch housing 2 with the display device arranged therein, the fire protection switch 1 being in a first, ready-to-operate operating state. The fire protection switch 1 has a tripping device 20 which in turn has a tripping coil 21 and a tripping plunger 22 which is movably mounted in a first direction x relative to it. In the illustration shown in FIG. 1B, the trigger plunger 22 is in a position ready for triggering and is energized into the triggered position by energizing the trigger coil 21 (see Figure 2B ) transferable.

Das Anzeigeelement 10 ist prinzipiell in einer zweiten Richtung y, welche quer - insbesondere orthogonal - zur ersten Richtung x orientiert ist, relativ zum Gehäuse 2 zwischen einer ersten, in Figur 1B dargestellten Position, und einer in Figur 2B dargestellten zweiten Position, verschiebbar gelagert. Das Anzeigeelement 10 besteht im Wesentlichen aus einem länglichen Schaft 11, welcher sich in der zweiten Richtung y erstreckt, sowie einen an einem unteren Ende des Schafts 11 ausgebildeten Fuß 12, welcher in der ersten Richtung x über den Schaft 11 hinausragt. Der Fuß 12 kann dabei an den Schaft 11 angeformt sein, so dass das Anzeigeelement 10 einstückig ausgebildet ist.The display element 10 is in principle in a second direction y, which is oriented transversely - in particular orthogonally - to the first direction x, relative to the housing 2 between a first, in Figure 1B position shown, and one in Figure 2B shown second position, slidably mounted. The display element 10 essentially consists of an elongated shaft 11, which extends in the second direction y, and a foot 12, which is formed at a lower end of the shaft 11 and which projects beyond the shaft 11 in the first direction x. The foot 12 can be integrally formed on the shaft 11, so that the display element 10 is formed in one piece.

Weiterhin weist der Brandschutzschalter 1 einen im Inneren des Gehäuses 2 befestigten Mikroschalter 40 auf, welcher als Mikrotaster ausgebildet ist und durch ein Bewegen des Anzeigeelements 10 in eine dritte Position (s. Fig.3) betätigbar ist. Hierzu wird das Anzeigeelement 10 von Hand oder mit Hilfe eines Werkzeugs entgegen der zweiten Richtung y ein Stück weit in das Gehäuse 2 des Brandschutzschalters 1 hineingedrückt, bis der Fuß 12 oder der Schaft 11 des Anzeigeelements 10 den Mikroschalter 40 berührt und damit betätigt. Durch Betätigen des Mikroschalters 40 ist eine RESET-Funktion des Brandschutzschalters 1 initiierbar, durch die dieser in seinen auslösebereiten Ausgangszustand zurückversetzt wird.Furthermore, the fire protection switch 1 has a microswitch 40 fastened in the interior of the housing 2, which is designed as a microswitch and by moving the display element 10 into a third position (see FIG. Figure 3 ) can be actuated. For this purpose, the display element 10 is pressed a little into the housing 2 of the fire protection switch 1 by hand or with the aid of a tool in the opposite direction y until the foot 12 or the shaft 11 of the display element 10 touches the microswitch 40 and is thus actuated. By actuating the microswitch 40, a RESET function of the fire protection switch 1 can be initiated, by means of which the fire protection switch 1 is reset to its initial state ready for triggering.

Ferner weist der Brandschutzschalter 1 eine LED 30 auf, welche im Inneren des Gehäuses 2 unterhalb des Schafts 11 des Anzeigeelements 10 angeordnet ist. Sofern das Anzeigeelement 10 als Lichtleiter zur Übertragung eines Lichtsignals ausgebildet ist, kann mit Hilfe dieser LED 30 zusätzlich zur mechanischen Lageänderung des Anzeigeelements 10 ein optisches Signal generiert werden, welches einem Operator signalisiert, dass der Brandschutzschalter 1 aufgrund eines von ihm erfassten Fehlerstroms ausgelöst worden ist. Ist die LED 30 darüber hinaus als Mehrfarben-LED ausgebildet, so können durch eine entsprechend differenzierte Farbgebung auch mehrere, unterschiedliche Betriebszustände des Brandschutzschalters 1 angezeigt werden.Furthermore, the fire protection switch 1 has an LED 30, which is arranged in the interior of the housing 2 below the shaft 11 of the display element 10. If the display element 10 is designed as a light guide for transmitting a light signal, this LED 30 can be used to generate an optical signal in addition to the mechanical change in position of the display element 10, which signals to an operator that the fire protection switch 1 has been triggered due to a fault current detected by it , If the LED 30 is also designed as a multicolor LED, several different operating states of the fire protection switch 1 can also be displayed by means of a correspondingly differentiated coloring.

Zur Übertragung des Auslösesignals an ein mit dem Brandschutzschalter 1 gekoppeltes, weiteres Schutzschaltgerät, beispielsweise einen Leitungsschutzschalter (LS-Schalter) oder einen kombinierten Leitungsschutz-/Fehlerstromschutzschalter (LS/FI-Schalter), weist der Brandschutzschalter 1 ein Koppelelement 50 auf, welches in einer der Breitseiten 6 des Gehäuses 2 drehbar gelagert ist. Das Koppelelement 50 weist eine Wirkverbindung zu dem Auslösestößel 22 auf, derart, dass das Koppelelement 50 im Falle einer Auslösung des Brandschutzschalters durch den Auslösestößel 22 zu einer Drehbewegung veranlasst wird. Diese Drehbewegung wird an das mit dem Brandschutzschalter 1 gekoppelte weitere Schutzschaltgerät übertragen und bewirkt, dass dieses ebenfalls ausgelöst wird, wodurch die zu überwachende elektrische Leitung unterbrochen wird. Zum Zurückstellen des Koppelelements 50 in seine ursprüngliche Lage ist eine Rückstellfeder 51 vorgesehen, welche als Drehfeder ausgebildet ist, am Koppelement 50 angreift und am Gehäuse 2 abgestützt ist.In order to transmit the trigger signal to a further protective switching device coupled to the fire protection switch 1, for example a circuit breaker (circuit breaker) or a combined circuit breaker / residual current circuit breaker (circuit breaker / FI switch), the fire protection switch 1 has a coupling element 50 which is arranged in a the broad sides 6 of the housing 2 is rotatably supported. The coupling element 50 has an operative connection to the trigger plunger 22 such that the coupling element 50 to one in the event of the fire protection switch being triggered by the trigger plunger 22 Rotational movement is initiated. This rotary movement is transmitted to the further protective switching device coupled to the fire protection switch 1 and has the effect that this is also triggered, as a result of which the electrical line to be monitored is interrupted. To return the coupling element 50 to its original position, a return spring 51 is provided, which is designed as a torsion spring, acts on the coupling element 50 and is supported on the housing 2.

In der Darstellung der Figur 1B nimmt das Anzeigeelement 10 eine erste Position ein, in der der Fuß 12 des Anzeigeelements 10 mit dem Auslösestößel 22 der Auslöseeinrichtung 20 eine Hinterschneidung bildet. Auf diese Weise wird - in dem in Figur 1B dargestellten, auslösebereiten Betriebszustand des Brandschutzschalters 1 - eine Bewegung des Anzeigeelements 10 von der in Figur 1B dargestellten ersten Position in seine in Figur 2B dargestellte zweite Position gehemmt. Solange sich der Auslösestößel 22 in seiner auslösebereiten Stellung befindet, wird ein Bewegen des Anzeigeelements 10 in seine zweite Position, welche einer Bedienperson eine erfolgte Auslösung des Brandschutzschalters 1 signalisiert, aufgrund der Hinterschneidung des rechten Endes des Auslösestößels 22 mit dem Fuß 12 des Anzeigeelements 10, wirksam verhindert.In the representation of the Figure 1B the display element 10 assumes a first position in which the foot 12 of the display element 10 forms an undercut with the trigger plunger 22 of the trigger device 20. In this way - in the Figure 1B Shown, trigger-ready operating state of the fire protection switch 1 - a movement of the display element 10 from the in Figure 1B illustrated first position in its in Figure 2B second position shown inhibited. As long as the trigger plunger 22 is in its ready-to-trigger position, moving the display element 10 into its second position, which signals to an operator that the fire protection switch 1 has been triggered, due to the undercut of the right end of the trigger plunger 22 with the foot 12 of the display element 10, effectively prevented.

Die Figuren 2A und 2B zeigen schematisch den erfindungsgemäßen Brandschutzschalter 1 in einem zweiten Betriebszustand, bei dem der Brandschutzschalter 1 aufgrund eines detektierten Fehlerstroms bereits ausgelöst hat. Das Anzeigeelement 10 befindet sich dabei in seiner zweiten Position und ragt mit seinem oberen Ende über die Außenkontur der Frontseite 3 des Brandschutzschaltergehäuses 2 hinaus. Figur 2A zeigt dabei wiederum eine perspektivische Außenansicht des ausgelösten Brandschutzschalters 1 bei geschlossenem Gehäuse 2, während in Figur 2B die dazugehörige Detaildarstellung des geöffneten Brandschutzschaltergehäuses 2 mit der darin angeordneten Anzeigevorrichtung dargestellt ist, wobei sich der Brandschutzschalter 1 in einem zweiten, ausgelösten Betriebszustand befindet. Durch ein Auslösesignal aufgrund eines erfassten Fehlerstroms wurde die Auslösespule 21 bestromt, wodurch der Auslösestößel 22 mittels einer Bewegung in der ersten Richtung x in seine zweite, ausgelöste Stellung verbracht wurde.The Figures 2A and 2B schematically show the fire protection switch 1 according to the invention in a second operating state, in which the fire protection switch 1 has already triggered due to a detected fault current. The display element 10 is in its second position and protrudes with its upper end beyond the outer contour of the front side 3 of the fire protection switch housing 2. Figure 2A here again shows an external perspective view of the triggered fire protection switch 1 with the housing 2 closed, while in Figure 2B the associated detailed representation of the open fire protection switch housing 2 is shown with the display device arranged therein, the fire protection switch 1 is in a second, triggered operating state. The trigger coil 21 was energized by a trigger signal based on a detected fault current, as a result of which the trigger plunger 22 was brought into its second, triggered position by means of a movement in the first direction x.

Durch die Bewegung des Auslösestößels 22 in seine ausgelöste Stellung wird die Hinterschneidung des rechten Endes des Auslösestößels 22 mit dem Fuß 12 des Anzeigeelements 10 aufgehoben. Dadurch ist das Anzeigeelement 10 nicht mehr in seiner Bewegung blockiert. Aufgrund der durch das Federelement 15 auf das Anzeigeelement 10 ausgeübten Federkraft wird das Anzeigeelement 10 in seine (in Figur 2B dargestellte) zweite Position bewegt und dort gehalten. In dieser zweiten Position befindet sich der Fuß 12 des Anzeigeelements 10 auf Höhe des Auslösestößels 22, wodurch ein Zurückstellen des Auslösestößels 22 von seiner ausgelösten Stellung in seine auslösebereite Stellung blockiert ist. Dies ist so lange der Fall, bis das Anzeigeelement 10 manuell oder mit Hilfe eines Werkzeugs wieder in seine, in Figur 1B dargestellte, erste Position zurückverbracht wird. Erst wenn sich das Anzeigeelement wieder in seiner ersten Position befindet, ist der Auslösestößel 22 nicht mehr blockiert und kann - beispielsweise mittels einer eigenen Rückstellfeder - wieder in seine auslösebereite Stellung zurückgestellt werden.By moving the trigger plunger 22 into its triggered position, the undercut of the right end of the trigger plunger 22 with the foot 12 of the display element 10 is canceled. As a result, the display element 10 is no longer blocked in its movement. Due to the spring force exerted by the spring element 15 on the display element 10, the display element 10 is pushed into its (in Figure 2B shown) moved second position and held there. In this second position, the foot 12 of the display element 10 is located at the level of the trigger plunger 22, as a result of which a return of the trigger plunger 22 from its triggered position to its ready-to-trigger position is blocked. This is the case until the display element 10 is returned to it manually or with the aid of a tool Figure 1B shown, first position is returned. Only when the display element is again in its first position is the trigger plunger 22 no longer blocked and can be returned to its ready-to-trigger position, for example by means of its own return spring.

Befindet sich das Anzeigeelement 10 in seiner zweiten Position, so ist dadurch nicht nur das Zurückstellen des Auslösestößels 22 in seiner ausgelösten Stellung, sondern auch das Zurückstellen des Koppelements 50 blockiert, wodurch ein Wiedereinschalten des mit dem Brandschutzschalter 1 gekoppelten, weiteren Schutzschaltgerätes verhindert wird. Um das weitere Schutzschaltgerät wieder einzuschalten muss daher zunächst der Brandschutzschalter durch eine manuelle Betätigung des Anzeigeelements 10 in seinen auslösebereiten Betriebszustand zurückversetzt werden, bevor der zu überwachende Stromkreis durch Einschalten des weiteren Schutzschaltgerätes wieder geschlossen wird. Auf diese Weise ist gewährleistet, dass zunächst eine Bedienperson die Auslösung des Brandschutzschalters 1 registrieren und aktiv quittieren muss. Ein automatisches Wiedereinschalten durch Schließen des zu überwachenden Stromkreises wird damit wirksam unterbunden.If the display element 10 is in its second position, this not only blocks the resetting of the trigger plunger 22 in its triggered position, but also the resetting of the coupling element 50, thereby preventing the further protective switching device coupled to the fire protection switch 1 from being switched on again. In order to switch the additional protective switching device on again, the fire protection switch must therefore first be reset to its triggerable operating state by manually actuating the display element 10 before the circuit to be monitored is closed again by switching on the additional protective switching device becomes. This ensures that an operator must first register the triggering of the fire protection switch 1 and actively acknowledge it. An automatic restart by closing the circuit to be monitored is effectively prevented.

In Figur 3 ist der Brandschutzschalter in einem dritten Betriebszustand, bei dem das Anzeigeelement 10 seine dritte Position einnimmt, schematisch dargestellt. Um das Anzeigeelement 10 in seine dritte Position zu verbringen, wird es von Hand oder mit Hilfe eines Werkzeugs entgegen der zweiten Richtung y ein Stück weit in das Gehäuse 2 des Brandschutzschalters 1 hineingedrückt, bis der Fuß 12 oder der Schaft 11 des Anzeigeelements 10 den Mikroschalter 40 berührt und damit betätigt. Dies kann sowohl von der zweiten Position als auch von der ersten Position des Anzeigeelements 10 aus erfolgen. Durch die Betätigung des Mikroschalters 40 wird dann eine RESET-Funktion initiiert, welche den Brandschutzschalter 1 in seinen auslösebereiten Ausgangszustand zurückversetzt.In Figure 3 the fire protection switch is shown schematically in a third operating state in which the display element 10 assumes its third position. In order to move the display element 10 into its third position, it is pushed a little by hand or with the aid of a tool against the second direction y into the housing 2 of the fire protection switch 1 until the foot 12 or the shaft 11 of the display element 10 pushes the microswitch 40 touched and actuated. This can be done both from the second position and from the first position of the display element 10. By actuating the microswitch 40, a RESET function is then initiated, which resets the fire protection switch 1 to its ready-to-trigger initial state.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
BrandschutzschalterFire protection switch
22
Gehäusecasing
33
Frontseitefront
44
Befestigungsseitemounting side
55
Schmalseitenarrow side
66
Breitseitebroadside
1010
Anzeigeelementdisplay element
1111
Schaftshaft
1212
Fußfoot
1515
Federelementspring element
2020
Auslöseeinrichtungtriggering device
2121
Auslösespuletrip coil
2222
AuslösestößelActuation tappet
3030
LEDLED
4040
Mikrotaster / MikroschalterMicro button / microswitch
5050
Koppelelementcoupling element
5151
RückstellfederReturn spring
xx
erste Richtungfirst direction
yy
zweite Richtungsecond direction

Claims (8)

  1. Arc fault detection device (1) for detecting a predefined fault current,
    - comprising a housing (2),
    - comprising an indicator apparatus with a tripping device (20) which has a tripping coil (21) and also a tripping tappet (22) which is mounted such that it can move relative to the said tripping coil and can be shifted from a ready-to-trip position to a tripped position by applying current to the tripping coil (21), comprising an indicator element (10) which, when the tripping device (20) is tripped, can be moved from a first position to a second position, which indicator apparatus is received and held in the housing (2),
    - comprising a coupling element (50) which, in a manner formed in a side wall (6) of the housing (2), is provided for coupling the arc fault detection device (1) to a further circuit breaker,
    - wherein the coupling element (50) is coupled to the tripping tappet (22) of the indicator apparatus in such a way that, in the event of a movement of the tripping tappet (22) to its tripped position, a tripping signal can be transmitted by means of the coupling element (50) to the further circuit breaker which is coupled to the arc fault detection device (1), wherein the indicator element (10) is held in its first position by the tripping tappet (22) which is in the ready-to-trip position and can be released by shifting the tripping tappet (22) to its tripped position, wherein the tripping tappet (22) is blocked from returning to its ready-to-trip position from its tripped position by the indicator element (10) in its second position,
    - wherein the indicator element (10) can be moved to a third position, as a result of which the arc fault detection device (1) can be reset to a ready-to-trip state,
    - wherein the first position is situated between the second position and the third position, and
    - wherein the arc fault detection device (1) has a microbutton (40) which can be operated by a movement of the indicator element (10) to its third position, as a result of which the arc fault detection device (1) is reset to a ready-to-trip state.
  2. Arc fault detection device (1) according to Claim 1,
    - wherein the indicator element (10) is of L-shaped design and has a shaft (11) which is oriented in a movement direction of the indicator element (10) and has a foot (12) which is oriented transversely to the movement direction.
  3. Arc fault detection device (1) according to Claim 2,
    - wherein, in the ready-to-trip position, the foot (12) forms an undercut with the tripping tappet (22), which undercut prevents a movement of the indicator element (10) from its first position to its second position,
    - wherein the foot (12) is released in the tripped position of the tripping tappet (22), and
    - wherein the foot (12) blocks the tripping tappet (22) from returning to its ready-to-trip position from its tripped position in the second position of the indicator element (10).
  4. Arc fault detection device (1) according to one of the preceding claims, wherein the indicator element (10) is coupled to a spring element (15) which forces the indicator element (10) from the first position to the second position.
  5. Arc fault detection device (1) according to one of the preceding claims, wherein the indicator element (10) is designed as a light guide for transmitting a light signal.
  6. Arc fault detection device (1) according to Claim 5, wherein the light signal can be generated by means of a multicoloured LED (30) or a plurality of individual LEDs in order to optically signal different states of the arc fault detection device (1).
  7. Arc fault detection device (1) according to one of the preceding claims, wherein the coupling element (50) has a spring element (51) which counteracts the movement of the coupling element (50) which is initiated by the tripping device (20).
  8. Arc fault detection device (1) according to one of the preceding claims, wherein the coupling element (50) is mounted, as a rotatably movably mounted driver, in the side wall (6) of the arc fault detection device (1).
EP15198047.1A 2015-01-22 2015-12-04 Indicator and arc fault detection device Active EP3048630B1 (en)

Applications Claiming Priority (1)

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DE102015201009.0A DE102015201009A1 (en) 2015-01-22 2015-01-22 Display device and fire protection switch

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CN109712852B (en) * 2018-12-19 2020-07-10 河南平高电气股份有限公司 High-voltage switch under-voltage tripping device and high-voltage switch using same
EP3764496A1 (en) 2019-07-10 2021-01-13 Hager-Electro Sas Method allowing, from a protection device, indication of at least one item of fault information relating to at least one fault detected in a power line, such a protection device and electrical installation comprising at least one such protection device

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US20040095696A1 (en) * 1998-08-24 2004-05-20 Ziegler William R. Circuit interrupting system with independent trip and reset lockout
EP1628317A2 (en) * 2004-08-19 2006-02-22 Siemens Aktiengesellschaft Circuit breaker with short circuit and overload trip indicator and according method
CN103915297B (en) * 2014-03-25 2016-10-05 上海诺雅克电气有限公司 There is the chopper of indicating fault

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DE102015201009A1 (en) 2016-07-28
CN105826141A (en) 2016-08-03
EP3048630A1 (en) 2016-07-27

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