EP0350825B1 - Electrical switch gear - Google Patents

Electrical switch gear Download PDF

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Publication number
EP0350825B1
EP0350825B1 EP89112549A EP89112549A EP0350825B1 EP 0350825 B1 EP0350825 B1 EP 0350825B1 EP 89112549 A EP89112549 A EP 89112549A EP 89112549 A EP89112549 A EP 89112549A EP 0350825 B1 EP0350825 B1 EP 0350825B1
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EP
European Patent Office
Prior art keywords
current path
arc
contact point
main
arc extinguishing
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.)
Expired - Lifetime
Application number
EP89112549A
Other languages
German (de)
French (fr)
Other versions
EP0350825A2 (en
EP0350825A3 (en
Inventor
Erhard Runtsch
Klaus Greefe
Dietmar Dymke
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.)
ABB AG Germany
ABB AB
Original Assignee
Asea Brown Boveri AG Germany
Asea Brown Boveri AB
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Publication date
Application filed by Asea Brown Boveri AG Germany, Asea Brown Boveri AB filed Critical Asea Brown Boveri AG Germany
Publication of EP0350825A2 publication Critical patent/EP0350825A2/en
Publication of EP0350825A3 publication Critical patent/EP0350825A3/en
Application granted granted Critical
Publication of EP0350825B1 publication Critical patent/EP0350825B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns
    • H01H9/465—Shunt circuit closed by transferring the arc onto an auxiliary electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/42—Impedances connected with contacts

Definitions

  • the invention relates to electrical switching devices, in particular automatic switches, such as. B. automatic circuit breakers, with a main current path between an access and an outgoing terminal, with at least one main contact point in the main current path, which can be acted upon by a magnetic and / or thermal release and cooperates with an arc extinguishing device, and with a secondary current path associated with the main current path with a contact point , which serves as a current limiting device.
  • automatic switches such as. B. automatic circuit breakers
  • a proven measure is to have the switching arc that arises when the contact arrangement is actuated commutated into an arc extinguishing device and to extinguish it there as quickly as possible.
  • the arc has a current-limiting effect.
  • the solution to the problem is characterized in that the secondary current path is connected to the main current path via the arc quenching device and is de-energized in undisturbed operation and is only switched on by a switching arc of the open main contact point, which commutates in the arc quenching device.
  • the secondary current path is designed to have a low resistance to the main current path, its electrical internal resistance being at most 1/10 of the resistance of the main current path.
  • the current limiting device in the secondary current path is formed by a contact arrangement which opens dynamically as a result of the current flow.
  • a preferred arrangement of the current limiting device provides that it is arranged between the access terminal and the arc quenching device in the bypass path.
  • the switching device it is provided to arrange the current limiting device between the arc quenching device and the outgoing terminal.
  • a further preferred embodiment of the invention in particular in the case of electrical switching devices for high rated switching powers, provides for the main contact point to be in the form of a double contact point, a first and a second main contact point being connected in series with one another and each interacting with an arc quenching device.
  • the current limiting device in the secondary current path is in turn arranged either between the access terminal and the arc quenching device of the first main contact point or the arc quenching device of the second main contact point and the outgoing terminal.
  • a major advantage of the embodiment according to the invention described above is that the secondary current path is only switched on when the main current path is interrupted by opening the main contact point.
  • the switching arc that arises when the main contact point is opened commutates into the arc quenching device, which in turn gives the secondary current path a conductive connection to the main current path and commutates the current into the secondary current path.
  • the arc quenching device is preferably formed from individual stacked arc quenching plates, between which individual arcs ignite. The voltage drop at the individual arcs leads to a current limitation in addition to that of the current limiting device in the secondary current path.
  • FIG. 1 shows the basic circuit diagram of an electrical switching device 10, which has a main current path 12 with a magnetic release 14, a thermal release 16 and a main contact point 18.
  • the main current path 12 starts from an access terminal 20 and ends at an outgoing terminal 21.
  • the main contact point 18 has a movable contact piece 17 and a fixed contact piece 19 which is connected to an arc guide rail 23 belonging to an arc extinguishing device 22.
  • the arc quenching device 22 is formed from individual stacked arc quenching plates 24 which are delimited to the main contact point by the arc guide rail 23 and on the opposite side by a second arc guide rail 25.
  • the second arc guide rail 25 is part of a secondary current path 26 which leads from the access terminal 20 and which has a current limiting device 28 between the second arc guide rail 25 and the access terminal.
  • the current limiting device 28 is provided as a dynamically opening contact arrangement, in which, as a result of an electrodynamic lifting force resulting from a current conducted in the secondary current path 26, the movable contact piece (not shown here) of the dynamically opening contact arrangement of the current limiting device 28 lifts so far that the desired current limitation is caused by the switching arc that arises results.
  • the magnetic triggers 14 and thermal triggers 16 arranged in the main current path 12 are accordingly also currentless.
  • the recordable switching power for the short-circuit case described here is determined by the arc voltage which is generated in the current limiting device 28 and the arc extinguishing device 22.
  • FIG. 2 shows an electrical switching device 30 which has a main current path 32 with a magnetic release 34, a thermal release 36 and a main contact point 38.
  • the main current path 32 starts from an access terminal 40 and leads to an outgoing terminal 41.
  • the access terminal 40 connects directly to the main contact point 38, which is also a movable contact piece 37 and has a fixed contact piece 39.
  • the arrangement known from FIG. 1 in contrast to the arrangement known from FIG.
  • the fixed contact piece 39 is not connected in a galvanically conductive manner to an associated arc extinguishing device 42, but rather is adjacent to an associated arc guide rail 43, so that when the main contact point 38 is opened, the lifting contact piece 37 and the fixed contact piece open 39 resulting switching arc is first commutated on the arc guide rail 43 and from there into the arc extinguishing device 42 formed from individual arc extinguishing plates 44.
  • the side opposite the first arc guide rail 43 is delimited by a second arc guide rail 45, which is part of a bypass flow path 46, which is also provided by the access terminal 40 goes off and forms a first branch 461.
  • a second branch 462 of the secondary current path 46 which has a current limiting device 48 and is connected to the outgoer terminal 41, connects to the first arc guide rail 43 and thus forms a current path via the arc quenching device 42, which is currentless in the undisturbed intended operation.
  • the power loss of the switch is kept low in nominal operation, and nevertheless a high switching capacity is achieved in the event of a short circuit.
  • FIG. 3 shows a switching device 50 which has a main current path 52 with a magnetic release 54 and a thermal release 56.
  • the magnetic release 54 as well as the thermal release 56 are operatively connected to a downstream main contact point 58, which is also arranged in the main current path 52 but is equipped as a double contact point with a first main contact point 581 and a second main contact point 582.
  • the main current path 52 leads from an access terminal 60 to an outgoing terminal 61.
  • the two contact points 581, 582 belonging to the main contact point 58 each work together with an arc-quenching device 621, 622, which are formed from individual arc-quenching plates 64, which are each delimited by upper arc-guiding rails 631, 632 and lower arc-guiding rails 651, 652.
  • the upper arc guide rails 631, 632 are each conductively connected to a fixed contact piece 591, 592 of the associated main contact points 581, 582, which in turn are connected in series with one another via a connecting conductor 523.
  • the lower arc guide rails 651, 652 each belong to a secondary current path 66, which is formed from a first section 661 and a second section 662.
  • a current limiting device 68 In the first section 661 of the secondary current path 66, which extends from the access terminal 60, there is a current limiting device 68, which is also provided as a dynamically opening contact arrangement.
  • the secondary current path 66 leads from the current limiting device 68 directly to the lower arc guide rail 651 of the arc extinguishing device 621 of the first main contact point 581.
  • the second lower arc guide rail 652, which belongs to the arc extinguishing device 622 of the second main contact point 582, is connected to the second section 662 of the secondary current path 66, which leads to the Output terminal 61 leads.
  • An insulating partition 583 is used for the electrical insulation of the two arc extinguishing devices 621 and 622, which separates the two quenching plate assemblies 64 from one another.
  • the arc extinguishing device 621 of the first main contact point 581 is connected to the arc extinguishing device 622 of the second main contact point 582 via the connecting conductor 523, the switching arc ignited when the second main contact point 582 is opened also commutating from the lifting movable contact piece 572 into the arc extinguishing device 622.
  • the secondary current path 66 with its two subsections 661, 662 is live, while the main current path 52 with its two subsections 521, 522 is currentless.
  • the power loss is low due to the circuit arrangement shown in nominal operation, but a high switching capacity is nevertheless achieved in the event of a short circuit.
  • FIG. 4 shows a switching device 70 which has a main current path 72, consisting of the sections 721 and 722, with a magnetic release 74 and a thermal release 76.
  • the magnetic release 74 as well as the thermal release 76 are operatively connected to a main contact point 78 which is likewise arranged in the main current path 72 and which is equipped as a double contact point with a first main contact point 781 and a second main contact point 782.
  • the main current path 72 leads from an access terminal 80 to an outgoing terminal 81.
  • the two contact points 781, 782 belonging to the main contact point 78 each work together with an arc-quenching device 821, 822, which are formed from individual arc-quenching plates 84, which are each delimited by upper arc-guiding rails 831, 832 and lower arc-guiding rails 851, 852.
  • the upper arc guide rails 831, 832 are conductively connected via the sections 863 and 864 of the secondary current path 86 and the current limiting device 88.
  • the lower guide rails 851, 852 are connected via the sections 861 and 862 of the secondary current path 86 to the access terminal 80 and the partial section 722 of the main current path.
  • the connection of the sections 721 and 722 is established via the movable contact bridge 77, the sections 771, 772 of which are connected to the fixed contact pieces 791 and 792, respectively.
  • An insulating partition 783 is used for the electrical insulation of the two arc extinguishing devices 821 and 822, which separates the two quenching plate packs 84 from one another.
  • the secondary current path 86 with its subsections 861, 862, 863, 864 and the subsection 722 of the main current path 72 is live, while the subsection 721 is without current.
  • the contact arrangement 28 shown in FIG. 5 corresponds to the current limiting device 28 shown in the figure as a "black box". It has an electrical connection device 90 on the access side, to which an electrically conductive holding device 92 is attached, which serves as a bearing base for an axis 94. A movable contact 96 is mounted on this axis 94, the electrical connection to the holding device 92 being made via a wire 96.
  • the movable contact 96 forms with a fixed contact 97, which is located on a conductor piece 100 between its subsections 101 and 102 is an electrical connection, wherein the contact force is generated by a spring 104.
  • the section 101 of the conductor 100 runs parallel and at a short distance from the movable contact 96, so that there is an electrodynamic repulsion of the movable contact 96 as soon as the holding force of the spring 104 is exceeded at a certain current.
  • the section 102 of the conductor 100 forms the guide rail for an arc quenching chamber 110 which is constructed from the quenching plates 112.
  • the electrical connection device 106 is located on the conductor 100.
  • the arc voltage generated here supports the short-circuit current limitation of the arc quenching chambers shown in FIGS. 1 to 4 (22, 42, 621, 622, 821, 822). If the repulsive force falls below the spring force due to the falling current, the movable contact 96 closes again.

Description

Die Erfindung betrifft elektrische Schaltgeräte, insbesondere Selbstschalter, wie z. B. Sicherungsautomaten, mit einem Hauptstrompfad zwischen einer Zugangs- und einer Abgangsklemme, mit wenigstens einer Hauptkontaktstelle im Hauptstrompfad, die von einem Magnet- und/oder Thermoauslöser beaufschlagbar ist und mit einer Lichtbogenlöscheinrichtung zusammenarbeitet, sowie mit einem, dem Hauptstrompfad zugeordneten Nebenstrompfad mit einer Kontaktstelle, die als Strombegrenzungseinrichtung dient.The invention relates to electrical switching devices, in particular automatic switches, such as. B. automatic circuit breakers, with a main current path between an access and an outgoing terminal, with at least one main contact point in the main current path, which can be acted upon by a magnetic and / or thermal release and cooperates with an arc extinguishing device, and with a secondary current path associated with the main current path with a contact point , which serves as a current limiting device.

Elektrische Schaltgeräte, insbesondere Selbstschalter, wie Sicherungsautomaten oder Motorschutzschalter, werden hinsichtlich ihrer Kontaktanordnung auf die Beanspruchung durch einen Maximalstrom ausgelegt. Ein solcher Maximalstrom ist im allgemeinenen ein mit der Schaltnennleistung des Schaltgerätes in Zusammenhang stehender voraussichtlicher Kurzschlußstrom, der vom Schaltgerät noch sicher beherrschbar sein muß. Demgemäß wird die Dimensionierung der Schalterbauteile im wesentlichen durch die hieraus resultierende Belastung bestimmt, wobei insbesondere die thermische Belastung durch den Schaltlichtbogen zu beachten ist.Electrical switching devices, in particular automatic switches, such as automatic circuit breakers or motor protection switches, are designed with regard to their contact arrangement for the stress caused by a maximum current. Such a maximum current is generally related to the switching power rating of the switching device expected short-circuit current, which must still be controllable by the switching device. Accordingly, the dimensioning of the switch components is essentially determined by the resulting load, with particular attention being paid to the thermal load from the switching arc.

Eine bewährte Maßnahme, wie sie beispielsweise aus der DE-OS 30 30 429 bekannt geworden ist, besteht darin, den bei Betätigung der Kontaktanordnung entstehenden Schaltlichtbogen in eine Lichtbogenlöscheinrichtung kommutieren zu lassen und dort möglichst schnell zum Erlöschen zu bringen. Dabei wirkt der Lichtbogen strombegrenzend.A proven measure, as has become known for example from DE-OS 30 30 429, is to have the switching arc that arises when the contact arrangement is actuated commutated into an arc extinguishing device and to extinguish it there as quickly as possible. The arc has a current-limiting effect.

Zur Unterstützung der Lichtbogenbewegung in die Löscheinrichtung können weitere Maßnahmen, wie magnetische Blasfelder, die von Magnetspulen oder Leiterschleifen herrühren und den Lichtbogen beaufschlagen, vorgesehen sein.To support the movement of the arc into the quenching device, further measures, such as magnetic blowing fields which originate from magnetic coils or conductor loops and act on the arc, can be provided.

Um das Kurzschlußschaltvermögen eines Motorschutzschalters oder eines Leistungsschalters zu verbessern ist es üblich, dynamisch öffnende Kontaktanordnungen in Reihe vor diese Schalter zu installieren, was den Nachteil einer erhöhten Verlustleistung im Nennbetrieb beinhaltet.In order to improve the short-circuit switching capacity of a motor protection switch or a circuit breaker, it is customary to install dynamically opening contact arrangements in series in front of these switches, which has the disadvantage of increased power loss during rated operation.

Ausgehend vom zuvor erläuterten Stand der Technik ist es Aufgabe der Erfindung ein Schaltgerät der eingangs genannten Art anzugeben, dessen Verlustleistung im ungestörten Betrieb möglichst gering ist, aber trotzdem eine Erhöhung des Kurzschlußschaltvermögens zu erreichen. Dabei soll durch einfache Gestaltung unter weitgehender Verwendung herkömmlicher Schalterbauteile auf kostengünstige Herstellbarkeit geachtet werden.Starting from the prior art explained above, it is an object of the invention to provide a switching device of the type mentioned, the power loss in undisturbed operation is as low as possible, but still achieve an increase in short-circuit switching capacity. In this case, simple design with extensive use of conventional switch components should ensure cost-effective manufacture.

Die Lösung der Aufgabe ist erfindungsgemäß dadurch gekennzeichnet, daß der Nebenstrompfad über die Lichtbogenlöscheinrichtung mit dem Hauptstrompfad verbunden und im ungestörten Betrieb stromlos ist und erst durch einen Schaltlichtbogen der geöffneten Hauptkontaktstelle, der in die Lichtbogenlöscheinrichtung kommutiert, eingeschaltet ist.The solution to the problem is characterized in that the secondary current path is connected to the main current path via the arc quenching device and is de-energized in undisturbed operation and is only switched on by a switching arc of the open main contact point, which commutates in the arc quenching device.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß der Nebenstrompfad gegenüber dem Hauptstrompfad niederohmig ausgelegt ist, wobei sein elektrischer Innenwiderstand höchstens 1/10 des Widerstandes des Hauptstrompfades beträgt.In a further embodiment of the invention it is provided that the secondary current path is designed to have a low resistance to the main current path, its electrical internal resistance being at most 1/10 of the resistance of the main current path.

Dies wird insbesondere dadurch erreicht, daß die Strombegrenzungseinrichtung im Nebenstrompfad durch eine infolge Stromdurchfluß dynamisch öffnende Kontaktanordnung gebildet ist.This is achieved in particular in that the current limiting device in the secondary current path is formed by a contact arrangement which opens dynamically as a result of the current flow.

Eine bevorzugte Anordnung der Strombegrenzungseinrichtung sieht vor, daß diese zwischen der Zugangsklemme und der Lichtbogenlöscheinrichtung im Nebenstrompfad angeordnet ist.A preferred arrangement of the current limiting device provides that it is arranged between the access terminal and the arc quenching device in the bypass path.

Gemäß einer anderen vorteilhaften Ausgestaltung des erfindungsgemäßen Schaltgerätes ist vorgesehen, die Strombegrenzungseinrichtung zwischen der Lichtbogenlöscheinrichtung und der Abgangsklemme anzuordnen.According to another advantageous embodiment of the switching device according to the invention, it is provided to arrange the current limiting device between the arc quenching device and the outgoing terminal.

Eine weitere bevorzugte Ausgestaltung der Erfindung insbesondere bei elektrischen Schaltgeräten für hohe Nennschaltleistungen sieht vor, die Hauptkontaktstelle als Doppelkontaktstelle auszubilden, wobei eine erste und eine zweite Hauptkontaktstelle miteinander in Reihe geschaltet sind und jeweils mit einer Lichtbogenlöscheinrichtung zusammenwirken.A further preferred embodiment of the invention, in particular in the case of electrical switching devices for high rated switching powers, provides for the main contact point to be in the form of a double contact point, a first and a second main contact point being connected in series with one another and each interacting with an arc quenching device.

Entsprechend der Erfindung ist dabei vorgesehen, die Strombegrenzungseinrichtung im Nebenstrompfad wiederum entweder zwischen der Zugangsklemme und der Lichtbogenlöscheinrichtung der ersten Hauptkontaktstelle oder der Lichtbogenlöscheinrichtung der zweiten Hauptkontaktstelle und der Abgangsklemme anzuordnen.According to the invention, the current limiting device in the secondary current path is in turn arranged either between the access terminal and the arc quenching device of the first main contact point or the arc quenching device of the second main contact point and the outgoing terminal.

Abhängig von den räumlichen Gegebenheiten des erfindungsgemäßen Schaltgerätes kann es allerdings auch vorteilhaft sein, die Strombegrenzungseinrichtung im Nebenstrompfad zwischen den beiden Lichtbogenlöscheinrichtungen vorzusehen.Depending on the spatial conditions of the switching device according to the invention, however, it may also be advantageous to provide the current limiting device in the secondary current path between the two arc extinguishing devices.

Ein wesentlicher Vorteil der vorstehend beschriebenen erfindungsgemäßen Ausgestaltung besteht darin, daß der Nebenstrompfad erst dann eingeschaltet ist, wenn der Hauptstrompfad durch Öffnung der Hauptkontaktstelle unterbrochen ist. Der beim Öffnen der Hauptkontaktstelle entstehende Schaltlichtbogen kommutiert dabei in die Lichtbogenlöscheinrichtung, wodurch wiederum der Nebenstrompfad eine leitende Verbindung mit dem Hauptstrompfad erhält und der Strom in den Nebenstrompfad kommutiert. Die Lichtbogenlöscheinrichtung ist dabei bevorzugt aus einzelnen übereinandergestapelten Lichtbogenlöschblechen gebildet, zwischen denen Einzellichtbögen zünden. Der Spannungsfall an den Einzellichtbögen führt hierbei zu einer Strombegrenzung zusätzlich zu der der Strombegrenzungseinrichtung im Nebenstrompfad.A major advantage of the embodiment according to the invention described above is that the secondary current path is only switched on when the main current path is interrupted by opening the main contact point. The switching arc that arises when the main contact point is opened commutates into the arc quenching device, which in turn gives the secondary current path a conductive connection to the main current path and commutates the current into the secondary current path. The arc quenching device is preferably formed from individual stacked arc quenching plates, between which individual arcs ignite. The voltage drop at the individual arcs leads to a current limitation in addition to that of the current limiting device in the secondary current path.

Diese und weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.These and further advantageous refinements of the invention are specified in the subclaims.

Anhand von in den Zeichnungen dargestellten Ausführungsbeispielen sollen die Erfindung, vorteilhafte Ausgestaltung und besondere Vorteile der Erfindung näher erläutert und beschrieben werden.The invention, advantageous embodiment and particular advantages of the invention are to be explained and described in more detail with reference to exemplary embodiments illustrated in the drawings.

Es zeigen:

Figur 1
Prinzipschaltbild eines Schaltgerätes mit Strombegrenzungseinrichtung im Nebenstrompfad zwischen Zugangsklemme und Lichtbogenlöscheinrichtung,
Figur 2
Prinzipschaltbild eines Schaltgerätes mit Strombegrenzungseinrichtung zwischen Lichtbogenlöscheinrichtung und Abgangsklemme,
Figur 3
Prinzipschaltbild eines Schaltgerätes mit Doppelunterbrechung und Strombegrenzungseinrichtung zwischen Zugangsklemme und Lichtbogenlöscheinrichtung der ersten Hauptkontaktstelle,
Figur 4
Prinzipschaltbild eines Schaltgerätes mit Doppelunterbrechung und Strombegrenzungseinrichtung zwischen den Lichtbogenlöscheinrichtungen der Hauptkontakte,
Figur 5
Aufbau einer Strombegrenzungseinrichtung.
Show it:
Figure 1
Basic circuit diagram of a switching device with current limiting device in the secondary current path between the access terminal and the arc extinguishing device,
Figure 2
Basic circuit diagram of a switching device with current limiting device between arc extinguishing device and outgoing terminal,
Figure 3
Basic circuit diagram of a switching device with double interruption and current limiting device between the access terminal and the arc extinguishing device of the first main contact point,
Figure 4
Basic circuit diagram of a switching device with double interruption and current limiting device between the arc extinguishing devices of the main contacts,
Figure 5
Construction of a current limiting device.

In Figur 1 ist das Prinzipschaltbild eines elektrischen Schaltgerätes 10 wiedergegeben, das einen Hauptstrompfad 12 mit einem Magnetauslöser 14, einem Thermoauslöser 16 und einer Hauptkontaktstelle 18 aufweist. Der Hauptstrompfad 12 geht aus von einer Zugangsklemme 20 und endet an einer Abgangsklemme 21. Die Hauptkontaktstelle 18 besitzt ein bewegliches Kontaktstück 17 und ein festes Kontaktstück 19, welches mit einer zu einer Lichtbogenlöscheinrichtung 22 gehörenden Lichtbogenleitschiene 23 verbunden ist. Die Lichtbogenlöscheinrichtung 22 ist aus einzelnen übereinandergestapelten Lichtbogenlöschblechen 24 gebildet, die zur Hauptkontaktstelle hin von der Lichtbogenleitschiene 23 und auf der gegenüberliegenden Seite von einer zweiten Lichtbogenleitschiene 25 begrenzt sind.1 shows the basic circuit diagram of an electrical switching device 10, which has a main current path 12 with a magnetic release 14, a thermal release 16 and a main contact point 18. The main current path 12 starts from an access terminal 20 and ends at an outgoing terminal 21. The main contact point 18 has a movable contact piece 17 and a fixed contact piece 19 which is connected to an arc guide rail 23 belonging to an arc extinguishing device 22. The arc quenching device 22 is formed from individual stacked arc quenching plates 24 which are delimited to the main contact point by the arc guide rail 23 and on the opposite side by a second arc guide rail 25.

Die zweite Lichtbogenleitschiene 25 ist Teil eines von der Zugangsklemme 20 abgehenden Nebenstrompfades 26, der zwischen der zweiten Lichtbogenleitschiene 25 und der Zugangsklemme eine Strombegrenzungseinrichtung 28 aufweist.The second arc guide rail 25 is part of a secondary current path 26 which leads from the access terminal 20 and which has a current limiting device 28 between the second arc guide rail 25 and the access terminal.

Die Strombegrenzungseinrichtung 28 ist dabei als dynamisch öffnende Kontaktanordnung vorgesehen, bei der infolge eines in den Nebenstrompfad 26 geleiteten Stromes entstehende elektrodynamische Abhebekräfte das hier nicht näher gezeigte bewegliche Kontaktstück der dynamisch öffnenden Kontaktanordnung der Strombegrenzungseinrichtung 28 soweit abhebt, daß durch den dabei entstehenden Schaltlichtbogen die gewünschte Strombegrenzung resultiert.The current limiting device 28 is provided as a dynamically opening contact arrangement, in which, as a result of an electrodynamic lifting force resulting from a current conducted in the secondary current path 26, the movable contact piece (not shown here) of the dynamically opening contact arrangement of the current limiting device 28 lifts so far that the desired current limitation is caused by the switching arc that arises results.

Bei dem in Figur 1 dargestellten Schaltungszustand des Schaltgerätes 10 findet der Stromfluß nur über den Hauptstrompfad 12 statt, da die Hauptkontaktstelle 18 geschlossen ist. Der Nebenstrompfad 26 ist demgemäß stromlos. Dieser Schaltungszustand entspricht dem ungestörten, bestimmungsgemäßen Betrieb, d. h. dem Normalbetrieb des Schaltgerätes 10.In the circuit state of the switching device 10 shown in FIG. 1, the current flow only takes place via the main current path 12, since the main contact point 18 is closed. The bypass path 26 is accordingly de-energized. This circuit state corresponds to the undisturbed, intended operation, i. H. the normal operation of the switching device 10.

Erst bei Unterbrechung des Hauptstrompfades 12 durch Öffnen der Hauptkontaktstelle 18 wird durch den beim Abheben des beweglichen Kontaktstückes 17 vom festen Kontaktstück 19 entstehenden Schaltlichtbogen, der in die Lichtbogenlöscheinrichtung 22 kommutiert, der Nebenstrompfad 26 eingeschaltet. Hierdurch wird der Hauptstrompfad zwischen der Zugangsklemme 20 und dem beweglichen Kontaktstück 17 stromlos, da der Strom vom Hauptstrompfad 12 auf den Nebenstrompfad 26 kommutiert und über die Lichtbogenlöscheinrichtung bzw. die darin zwischen den Löschblechen 24 trennenden Einzellichtbögen mit dem festen Kontaktstück 19 elektrisch leitend verbunden ist, welches an die Abgangsklemme 21 anschließt.Only when the main current path 12 is interrupted by opening the main contact point 18 is the bypass path 26 switched on by the switching arc which arises when the movable contact piece 17 is lifted from the fixed contact piece 19 and commutates in the arc extinguishing device 22. As a result, the main current path between the access terminal 20 and the movable contact piece 17 is de-energized, since the current commutates from the main current path 12 to the secondary current path 26 and is electrically conductively connected to the fixed contact piece 19 via the arc quenching device or the individual arcs separating therein between the quenching plates 24, which connects to the outgoing terminal 21.

Mit der Einschaltung des Nebenstrompfades 26 sind demgemäß auch die im Hauptstrompfad 12 angeordneten Magnetauslöser 14 und thermischer Auslöser 16 stromlos, d. h. die aufnehmbare Schaltleistung für den hier beschriebenen Kurzschlußfall wird durch die Lichtbogenspannung bestimmt, die in der Strombegrenzungseinrichtung 28 sowie der Lichtbogenlöscheinrichtung 22 erzeugt wird.With the activation of the secondary current path 26, the magnetic triggers 14 and thermal triggers 16 arranged in the main current path 12 are accordingly also currentless. H. the recordable switching power for the short-circuit case described here is determined by the arc voltage which is generated in the current limiting device 28 and the arc extinguishing device 22.

Figur 2 zeigt ein elektrisches Schaltgerät 30, das einen Hauptstrompfad 32 mit einem Magnetauslöser 34, einem thermischen Auslöser 36 und einer Hauptkontaktstelle 38 aufweist. Der Hauptstrompfad 32 geht aus von einer Zugangsklemme 40 und führt zu einer Abgangsklemme 41. Im Unterschied zu der in Figur 1 gezeigten Anordnung schließt bei dem in Figur 2 gezeigten elektrischen Schaltgerät 30 die Zugangsklemme 40 unmittelbar an die Hauptkontaktstelle 38 an, welche ebenfalls ein bewegliches Kontaktstück 37 und ein festes Kontaktstück 39 besitzt. Das feste Kontaktstück 39 ist jedoch im Unterschied der aus Figur 1 bekannten Anordnung nicht galvanisch leitend mit einer zugeordneten Lichtbogenlöscheinrichtung 42 verbunden sondern einer hierzu gehörigen Lichtbogenleitschiene 43 lediglich benachbart, so daß ein beim Öffnen der Hauptkontaktstelle 38 zwischen dem abhebenden beweglichen Kontaktstück 37 und dem festen Kontaktstück 39 entstehender Schaltlichtbogen zunächst auf die Lichtbogenleitschiene 43 kommutiert und von dort in die aus einzelnen Lichtbogenlöschblechen 44 gebildete Lichtbogenlöscheinrichtung 42. Die der ersten Lichtbogenleitschiene 43 gegenüberliegende Seite ist von einer zweiten Lichtbogenleitschiene 45 begrenzt, die Teil eines Nebenstromprades 46 ist, der ebenfalls von der Zugangsklemme 40 abgeht und hierbei einen ersten Zweig 461 bildet. Ein zweiter Zweig 462 des Nebenstrompfades 46, der eine Strombegrenzungseinrichtung 48 aufweist und mit der Abgangsklemme 41 verbunden ist, schließt an die erste Lichtbogenleitschiene 43 an und bildet so über die Lichtbogenlöscheinrichtung 42 einen Strompfad, der im ungestörten bestimmungsgemäßen Betrieb stromlos ist.FIG. 2 shows an electrical switching device 30 which has a main current path 32 with a magnetic release 34, a thermal release 36 and a main contact point 38. The main current path 32 starts from an access terminal 40 and leads to an outgoing terminal 41. In contrast to the arrangement shown in FIG. 1, in the electrical switching device 30 shown in FIG. 2, the access terminal 40 connects directly to the main contact point 38, which is also a movable contact piece 37 and has a fixed contact piece 39. However, in contrast to the arrangement known from FIG. 1, the fixed contact piece 39 is not connected in a galvanically conductive manner to an associated arc extinguishing device 42, but rather is adjacent to an associated arc guide rail 43, so that when the main contact point 38 is opened, the lifting contact piece 37 and the fixed contact piece open 39 resulting switching arc is first commutated on the arc guide rail 43 and from there into the arc extinguishing device 42 formed from individual arc extinguishing plates 44. The side opposite the first arc guide rail 43 is delimited by a second arc guide rail 45, which is part of a bypass flow path 46, which is also provided by the access terminal 40 goes off and forms a first branch 461. A second branch 462 of the secondary current path 46, which has a current limiting device 48 and is connected to the outgoer terminal 41, connects to the first arc guide rail 43 and thus forms a current path via the arc quenching device 42, which is currentless in the undisturbed intended operation.

Erst im zuvor erläuterten Auslösefall, wenn beispielsweise ein Kurzschlußstrom zur Öffnung der Hauptkontaktstelle 38 führt, wird durch den dabei verursachten Schaltlichtbogen, der in die Lichtbogenlöscheinrichtung 42 kommutiert, der Nebenstrompfad 46 eingeschaltet, so daß der Strom von dem Hauptstrompfad 32 auf den Nebenstrompfad 46 kommutiert und die Auslöseglieder 34, 36 im Hauptstrompfad 32 stromlos sind.Only in the previously described triggering case, for example when a short-circuit current leads to the opening of the main contact point 38, is the bypass arc 46 switched on by the switching arc caused thereby, which commutates in the arc quenching device 42, so that the current from the main current path 32 to the bypass path 46 commutates and the trip members 34, 36 in the main current path 32 are de-energized.

Auch mit dieser beispielhaft gezeigten Schaltungsanordnung wird die Verlustleistung des Schalters im Nennbetrieb gering gehalten und trotzdem wird im Kurzschlußfall ein hohes Schaltvermögen erreicht.With this circuit arrangement shown as an example, the power loss of the switch is kept low in nominal operation, and nevertheless a high switching capacity is achieved in the event of a short circuit.

In Figur 3 ist ein Schaltgerät 50 gezeigt, das einen Hauptstrompfad 52 mit einem Magnetauslöser 54 und einem thermischen Auslöser 56 aufweist. Der Magnetauslöser 54 wie auch der thermische Auslöser 56 stehen in Wirkverbindung mit einer ebenfalls im Hauptstrompfad 52 angeordneten aber nachgeschalteten Hauptkontaktstelle 58, die als Doppelkontaktstelle mit einer ersten Hauptkontaktstelle 581 und einer zweiten Hauptkontaktstelle 582 ausgerüstet ist. Auch hier führt der Hauptstrompfad 52 von einer Zugangsklemme 60 zu einer Abgangsklemme 61.FIG. 3 shows a switching device 50 which has a main current path 52 with a magnetic release 54 and a thermal release 56. The magnetic release 54 as well as the thermal release 56 are operatively connected to a downstream main contact point 58, which is also arranged in the main current path 52 but is equipped as a double contact point with a first main contact point 581 and a second main contact point 582. Here, too, the main current path 52 leads from an access terminal 60 to an outgoing terminal 61.

Die beiden zur Hauptkontaktstelle 58 gehörigen Kontaktstellen 581, 582 arbeiten jeweils mit einer Lichtbogenlöscheinrichtung 621, 622 zusammen, die aus einzelnen Lichtbogenlöschblechen 64 gebildet sind, welche jeweils von oberen Lichtbogenleitschienen 631, 632 und unteren Lichtbogenleitschienen 651, 652 begrenzt sind. Die oberen Lichtbogenleitschienen 631, 632 sind mit jeweils mit einem festen Kontaktstück 591, 592 der zugeordneten Hauptkontaktstellen 581, 582 leitend verbunden, die ihrerseits wiederum über einen Verbindungsleiter 523 miteinander in Reihe geschaltet sind.The two contact points 581, 582 belonging to the main contact point 58 each work together with an arc-quenching device 621, 622, which are formed from individual arc-quenching plates 64, which are each delimited by upper arc-guiding rails 631, 632 and lower arc-guiding rails 651, 652. The upper arc guide rails 631, 632 are each conductively connected to a fixed contact piece 591, 592 of the associated main contact points 581, 582, which in turn are connected in series with one another via a connecting conductor 523.

Die unteren Lichtbogenleitschienen 651, 652 gehören jeweils zu einem Nebenstrompfad 66, der aus einem ersten Abschnitt 661 und einem zweiten Abschnitt 662 gebildet ist. Im ersten Abschnitt 661 des Nebenstrompfades 66, der von der Zugangsklemme 60 abgeht, befindet sich eine Strombegrenzungseinrichtung 68, die ebenfalls als dynamisch öffnende Kontaktanordnung vorgesehen ist. Von der Strombegrenzungseinrichtung 68 führt der Nebenstrompfad 66 direkt zur unteren Lichtbogenleitschiene 651 der Lichtbogenlöscheinrichtung 621 der ersten Hauptkontaktstelle 581. Die zweite untere Lichtbogenleitschiene 652, die zur Lichtbogenlöscheinrichtung 622 der zweiten Hauptkontaktstelle 582 gehört, ist mit dem zweiten Abschnitt 662 des Nebenstrompfades 66 verbunden, der zur Abgangsklemme 61 führt. Zur elektrischen Isolierung der beiden Lichtbogenlöscheinrichtungen 621 und 622 dient eine Isoliertrennwand 583, die die beiden Löschblechpakete 64 gegeneinander abtrennt.The lower arc guide rails 651, 652 each belong to a secondary current path 66, which is formed from a first section 661 and a second section 662. In the first section 661 of the secondary current path 66, which extends from the access terminal 60, there is a current limiting device 68, which is also provided as a dynamically opening contact arrangement. The secondary current path 66 leads from the current limiting device 68 directly to the lower arc guide rail 651 of the arc extinguishing device 621 of the first main contact point 581. The second lower arc guide rail 652, which belongs to the arc extinguishing device 622 of the second main contact point 582, is connected to the second section 662 of the secondary current path 66, which leads to the Output terminal 61 leads. An insulating partition 583 is used for the electrical insulation of the two arc extinguishing devices 621 and 622, which separates the two quenching plate assemblies 64 from one another.

Im Kurzschlußfall, wenn die Hauptkontaktstelle 58 durch Ansprechen des Magnetauslösers 54 geöffnet ist, kommutiert der zwischen dem beweglichen Kontaktstück 571 der ersten Hauptkontaktstelle 581 und deren festen Kontaktstück 591 gezündete Lichtbogen in die zugeordnete Lichtbogenlöscheinrichtung 621, wodurch der Strom, von der Zugangsklemme 60 ausgehend, in den Nebenstrompfad 66 kommutiert. Über den Verbindungsleiter 523 ist die Lichtbogenlöscheinrichtung 621 der ersten Hauptkontaktstelle 581 mit der Lichtbogenlöscheinrichtung 622 der zweiten Hauptkontaktstelle 582 verbunden, wobei auch hier der beim Öffnen der zweiten Hauptkontaktstelle 582 gezündete Schaltlichtbogen vom abhebenden beweglichen Kontaktstück 572 in die Lichtbogenlöscheinrichtung 622 kommutiert. Auf diese Weise ist der Nebenstrompfad 66 mit seinen beiden Teilabschnitten 661, 662 stromführend, während der Hauptstrompfad 52 mit seinen beiden Teilabschnitten 521, 522 stromlos ist.In the event of a short circuit, when the main contact point 58 is opened by actuation of the magnetic release 54, the arc ignited between the movable contact piece 571 of the first main contact point 581 and its fixed contact piece 591 commutates into the associated arc extinguishing device 621, as a result of which the current, starting from the access terminal 60, enters into commutates the bypass path 66. The arc extinguishing device 621 of the first main contact point 581 is connected to the arc extinguishing device 622 of the second main contact point 582 via the connecting conductor 523, the switching arc ignited when the second main contact point 582 is opened also commutating from the lifting movable contact piece 572 into the arc extinguishing device 622. In this way, the secondary current path 66 with its two subsections 661, 662 is live, while the main current path 52 with its two subsections 521, 522 is currentless.

Auch hier gilt wiederum wie bei den zuvor erläuterten Beispielen, daß die Verlustleistung so durch die gezeigte Schaltungsanordnung im Nennbetrieb gering ist aber trotzdem im Kurzschlußfall ein hohes Schaltvermögen erreicht wird.Here again, as in the examples explained above, the power loss is low due to the circuit arrangement shown in nominal operation, but a high switching capacity is nevertheless achieved in the event of a short circuit.

In Figur 4 ist ein Schaltgerät 70 gezeigt, das einen Hauptstrompfad 72, bestehend aus den Teilabschnitten 721 bzw. 722, mit einem Magnetauslöser 74 und einem thermischen Auslöser 76 aufweist. Der Magnetauslöser 74 wie auch der thermische Auslöser 76 stehen in Wirkverbindung mit einer ebenfalls im Hauptstrompfad 72 angeordneten Hauptkontaktstelle 78, die als Doppelkontaktstelle mit einer ersten Hauptkontaktstelle 781 und einer zweiten Hauptkontaktstelle 782 ausgerüstet ist. Auch hier führt der Hauptstrompfad 72 von einer Zugangsklemme 80 zu einer Abgangsklemme 81.FIG. 4 shows a switching device 70 which has a main current path 72, consisting of the sections 721 and 722, with a magnetic release 74 and a thermal release 76. The magnetic release 74 as well as the thermal release 76 are operatively connected to a main contact point 78 which is likewise arranged in the main current path 72 and which is equipped as a double contact point with a first main contact point 781 and a second main contact point 782. Here, too, the main current path 72 leads from an access terminal 80 to an outgoing terminal 81.

Die beiden zur Hauptkontaktstelle 78 gehörigen Kontaktstellen 781, 782 arbeiten jeweils mit einer Lichtbogenlöscheinrichtung 821, 822 zusammen, die aus einzelnen Lichtbogenlöschblechen 84 gebildet sind, welche jeweils von oberen Lichtbogenleitschienen 831, 832 und unteren Lichtbogenleitschienen 851, 852 begrenzt sind. Die oberen Lichtbogenleitschienen 831, 832 sind über die Teilabschnitte 863 und 864 des Nebenstrompfades 86, sowie die Strombegrenzungseinrichtung 88 leitend verbunden. Die unteren Leitschienen 851, 852 sind über die Teilabschnitte 861 und 862 des Nebenstrompfades 86 mit der Zugangsklemme 80 bzw. dem Teilabschnitt 722 des Hauptstrompfades verbunden. Die Verbindung der Teilabschnitte 721 und 722 wird über die bewegliche Kontaktbrücke 77 hergestellt, deren Teilabschnitte 771, 772 mit den Festkontaktstücken 791 bzw. 792 in Verbindung stehen.The two contact points 781, 782 belonging to the main contact point 78 each work together with an arc-quenching device 821, 822, which are formed from individual arc-quenching plates 84, which are each delimited by upper arc-guiding rails 831, 832 and lower arc-guiding rails 851, 852. The upper arc guide rails 831, 832 are conductively connected via the sections 863 and 864 of the secondary current path 86 and the current limiting device 88. The lower guide rails 851, 852 are connected via the sections 861 and 862 of the secondary current path 86 to the access terminal 80 and the partial section 722 of the main current path. The connection of the sections 721 and 722 is established via the movable contact bridge 77, the sections 771, 772 of which are connected to the fixed contact pieces 791 and 792, respectively.

Zur elektrischen Isolierung der beiden Lichtbogenlöscheinrichtunge 821 und 822 dient eine Isoliertrennwand 783, die die beiden Löschblechpakete 84 gegeneinander abtrennt.An insulating partition 783 is used for the electrical insulation of the two arc extinguishing devices 821 and 822, which separates the two quenching plate packs 84 from one another.

Im Kurzschlußfall, wenn die Hauptkontaktstelle 78 durch Ansprechen des Magnetauslösers 74 geöffnet wird, kommutiert der zwischen dem Teilstück 771 der beweglichen Kontaktbrücke 77 und dem festen Kontaktstück 791 entstehende Lichtbogen in die zugeordnete Lichtbogenlöscheinrichtung 821, wodurch der Strom, von der Zugangsklemme 80 ausgehend, in den Teilabschnitt 861 des Nebenstrompfades 86 kommutiert. Über die Teilabschnitte 863, 864 sowie über die Strombegrenzungseinrichtung 88 ist die Verbindung zur Lichtbogenlöscheinrichtung 822 hergestellt, in die der beim Abheben des Teilstückes 772 der Kontaktbrücke 77 vom Festkontakt 792 entstehende Lichtbogen kommutiert.In the event of a short circuit, when the main contact point 78 is opened by the triggering of the magnetic release 74, the arc which arises between the section 771 of the movable contact bridge 77 and the fixed contact piece 791 commutates into the associated arc quenching device 821, as a result of which the current proceeding from the access terminal 80 into the Section 861 of the secondary current path 86 commutates. The connection to the arc quenching device 822 is established via the sections 863, 864 and via the current limiting device 88, into which the arc that arises when the section 772 of the contact bridge 77 is lifted off from the fixed contact 792 is commutated.

Somit ist der Nebenstrompfad 86 mit seinen Teilabschnitten 861, 862, 863, 864 sowie der Teilabschnitt 722 des Hauptstrompfades 72 stromführend, während der Teilabschnitt 721 stromlos ist.Thus, the secondary current path 86 with its subsections 861, 862, 863, 864 and the subsection 722 of the main current path 72 is live, while the subsection 721 is without current.

Die in Figur 5 dargestellte Kontaktanordnung 28 entspricht der in Figur als "black box" gezeigten Strombegrenzungseinrichtung 28. Sie besitzt zugangsseitig eine elektrische Anschlußvorrichtung 90, an die sich eine elektrisch leitende Haltevorrichtung 92 angliedert, welche als Lagerstützpunkt für eine Achse 94 dient. Auf dieser Achse 94 ist ein beweglicher Kontakt96 gelagert, wobei die elektrische Verbindung zur Haltevorrichtung 92 über eine Litze 96 erfolgt. Der bewegliche Kontakt 96 bildet mit einem Festkontakt 97, der sich auf einem Leiterstück 100 zwischen seinen Teilabschnitten 101 und 102 befindet, eine elektrische Verbindung, wobei die Kontaktkraft durch eine Feder 104 erzeugt wird. Das Teilstück 101 des Leiters 100 verläuft parallel und in geringem Abstand zum beweglichen Kontakt 96, so daß es zu einem elektrodynamischen Abstoßen des beweglichen Kontaktes 96 kommt, sobald die Haltekraft der Feder 104 bei einem bestimmten Strom überschritten wird.The contact arrangement 28 shown in FIG. 5 corresponds to the current limiting device 28 shown in the figure as a "black box". It has an electrical connection device 90 on the access side, to which an electrically conductive holding device 92 is attached, which serves as a bearing base for an axis 94. A movable contact 96 is mounted on this axis 94, the electrical connection to the holding device 92 being made via a wire 96. The movable contact 96 forms with a fixed contact 97, which is located on a conductor piece 100 between its subsections 101 and 102 is an electrical connection, wherein the contact force is generated by a spring 104. The section 101 of the conductor 100 runs parallel and at a short distance from the movable contact 96, so that there is an electrodynamic repulsion of the movable contact 96 as soon as the holding force of the spring 104 is exceeded at a certain current.

Der Teilabschnitt 102 des Leiters 100 bildet die Leitschiene für eine Lichtbogenlöschkammer 110, die aus den Löschblechen 112 aufgebaut ist. Abgangsseitig befindet sich an dem Leiter 100 die elektrische Anschlußvorrichtung 106.The section 102 of the conductor 100 forms the guide rail for an arc quenching chamber 110 which is constructed from the quenching plates 112. On the output side, the electrical connection device 106 is located on the conductor 100.

Der beim Abheben des beweglichen Kontaktes 96 vom Festkontakt 97 entstehende Lichtbogen läuft in die aus ca. 5 bis 6 Löschblechen bestehende Lichtbogenlöschkammer 110 ein. Die hier erzeugte Lichtbogenspannung unterstützt die Kurzschlußstrombegrenzung der in Figur 1 bis 4 dargestellten Lichtbogenlöschkammern (22, 42, 621, 622, 821, 822). Sinkt die abstoßende Kraft aufgrund des fallenden Stromes unter die Federkraft, fällt der bewegliche Kontakt 96 wieder zu.The arc which arises when the movable contact 96 is lifted off the fixed contact 97 runs into the arc extinguishing chamber 110 which consists of approximately 5 to 6 quenching plates. The arc voltage generated here supports the short-circuit current limitation of the arc quenching chambers shown in FIGS. 1 to 4 (22, 42, 621, 622, 821, 822). If the repulsive force falls below the spring force due to the falling current, the movable contact 96 closes again.

Claims (15)

  1. Electrical switching device (10, 30, 50, 70), especially an automatic circuit breaker such as a line protective circuit breaker or motor protective circuit breaker, having a main current path (12, 32, 52, 72) between a feed terminal (20, 40, 60, 80) and an outlet terminal (21, 41, 61, 81), having at least one main contact point (18, 38, 58, 78) in the main current path (12, 32, 52, 72), which main contact point (18, 38, 58, 78) can be acted on by a magnetic release (14, 34, 54, 75) and/or a thermal release (16, 36, 56, 76) and which interacts with an arc extinguishing device (22, 42, 62, 82), and having an auxiliary current path (26, 46, 66, 86) which is arranged in parallel with the main current path (12, 32, 52, 72), has a current limiting device (28, 48, 68, 88) and bridges over part of the main current path (12, 32, 52, 72) between the feed terminal (20, 40, 60, 80) and the outlet terminal (21, 41, 61, 81), characterized in that the auxiliary current path (26, 46, 66, 86) is connected to the main current path (12, 32, 52, 72) via the arc extinguishing device (22, 42, 62, 82) and carries no current in fault-free operation, and in that a switching arc at the open main contact point (18, 38, 58, 78), which arc commutates into the arc extinguishing device (22, 42, 62, 82), switches on the auxiliary current path (26, 46, 66, 86).
  2. Electrical switching device according to Claim 1, characterized in that the auxiliary current path (26, 46, 66, 86) is designed to have a lower impedance than the main current path (12, 32, 52, 72).
  3. Electrical switching device according to Claim 2, characterized in that the electrical internal impedance of the auxiliary current path (26, 46, 66, 86) is at most 1/10 of the impedance of the main current path (12, 32, 52, 72).
  4. Electrical switching device according to one of the preceding claims, characterized in that the current limiting device (28, 48, 68, 88) in the auxiliary current path (26, 46, 66) is constructed as an interruption point having a contact arrangement which opens dynamically when a current flows through and whose switching arc causes current limiting.
  5. Electrical switching device according to Claim 4, characterized in that the current limiting device (28) in the auxiliary current path (26) is arranged between the feed terminal (28) and the arc extinguishing device (22).
  6. Electrical switching device according to Claim 5, characterized in that the current limiting device (28) is connected to an arc guide rail (25) which belongs to the arc extinguishing device (22) and is opposite a first arc guide rail (23) which is connected to the fixed contact piece (19) of the main contact point (18).
  7. Electrical switching device according to Claim 4, characterized in that the current limiting device (48) is arranged in the auxiliary current path (46), between the arc extinguishing device (42), which is connected in series with it, and the outlet terminal (41).
  8. Electrical switching device according to Claim 7, characterized in that the current limiting device (48) is connected to an upper arc guide rail (43) of the arc extinguishing device (42), onto which a switching arc, which emanates from the main contact point (38), commutates, and is connected via individual arcs, which burn in the arc extinguishing device (42), to a lower arc guide rail (45) which, for its part, is connected to the feed terminal (40).
  9. Electrical switching device according to Claim 4, characterized in that the main contact point (58), which is arranged in the main current path (52), is constructed as a double contact point with two mutually separate arc extinguishing devices (621, 622) via which a connection can be produced to the auxiliary current path (66), which has a current limiting device (68).
  10. Electrical switching device according to Claim 9, characterized in that the current limiting device (68) is arranged in a first sub-section (661) of the auxiliary current path (66), which sub-section (661) is passed from the feed terminal (60) to the arc extinguishing device (621) of the first contact point (581) of the main contact point (58), a connector conductor (523) being provided for connection to the second contact point (582) of the main contact point (58), which connector conductor (523) connects both the fixed contact pieces (591, 592) of the two contact point [sic] (581, 582) of the main contact point (58) and the upper guide rails (631, 632), which are connected thereto, of the associated arc extinguishing devices (621, 622), and in that a second sub-section (662) of the auxiliary current path (66) is connected to the lower arc guide rail (652) of the arc extinguishing device (622) which is assigned to the second contact point (582).
  11. Electrical switching device according to Claim 4, characterized in that the main contact point (78), which is arranged in the main current path (72) is constructed as a double contact point having two mutually separate arc extinguishing devices (821, 822), which are conductively connected via the sub-sections (863, 864) of the auxiliary current path (86) and the current limiting device (88).
  12. Electrical switching device according to Claim 11, characterized in that the current limiting device (88) is located in the auxiliary current path (86), whose first sub-section (861) connects the feed terminal (80) to the lower guide rail (851) of the arc extinguishing device (821) which is assigned to the first contact point (781), in that the connection of its upper guide rail (831) to the upper guide rail (832) of the arc extinguishing device (822) which is assigned to the second contact point (782) is provided via the sub-sections (863, 864) of the auxiliary current path (86) and via the current limiting device (88), and in that a second subsection (862) of the auxiliary current path (86) is connected to the lower arc guide rail (852) of the arc extinguishing device (822) which is assigned to the second contact point (782).
  13. Electrical switching device according to Claim 9 or 10, characterized in that the arc extinguishing devices (621, 622, 821, 822) which are assigned to the main contact point (58, 78) are insulated from one another by means of an insulating partition wall (583, 783).
  14. Electrical switching device according to one of the preceding claims, characterized in that the current limiting device (28, 48, 78, 98) is constructed as an arc-resistant contact arrangement whose moving contact piece (96) opens dynamically against the force of a closing spring (104) in the event of a current flow of suitable strength, the arc which is produced running into an associated arc extinguishing chamber (110).
  15. Electrical switching device according to Claim 14, characterized in that the fixed contact piece (97) of the current limiting device (28) is formed by a conductor loop (100) which is guided at least partially parallel to the moving contact piece (96).
EP89112549A 1988-07-15 1989-07-10 Electrical switch gear Expired - Lifetime EP0350825B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824027 1988-07-15
DE3824027A DE3824027A1 (en) 1988-07-15 1988-07-15 ELECTRICAL SWITCHGEAR

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EP0350825A2 EP0350825A2 (en) 1990-01-17
EP0350825A3 EP0350825A3 (en) 1991-04-17
EP0350825B1 true EP0350825B1 (en) 1995-02-01

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EP89112549A Expired - Lifetime EP0350825B1 (en) 1988-07-15 1989-07-10 Electrical switch gear

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Publication number Priority date Publication date Assignee Title
EP0504462A1 (en) * 1991-03-21 1992-09-23 Siemens Aktiengesellschaft Device to interrupt a circuit
ATE144076T1 (en) * 1991-03-21 1996-10-15 Siemens Ag SWITCHING DEVICE FOR INTERRUPTING A CIRCUIT
DE4243314C2 (en) * 1992-12-21 1998-08-20 Asea Brown Boveri Current limiting switch
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Also Published As

Publication number Publication date
DE3824027A1 (en) 1990-01-18
EP0350825A2 (en) 1990-01-17
EP0350825A3 (en) 1991-04-17
DE58908959D1 (en) 1995-03-16

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