EP0309382B1 - Contact arrangement for a low-voltage circuit breaker with an electrodynamic opening - Google Patents

Contact arrangement for a low-voltage circuit breaker with an electrodynamic opening Download PDF

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Publication number
EP0309382B1
EP0309382B1 EP88730198A EP88730198A EP0309382B1 EP 0309382 B1 EP0309382 B1 EP 0309382B1 EP 88730198 A EP88730198 A EP 88730198A EP 88730198 A EP88730198 A EP 88730198A EP 0309382 B1 EP0309382 B1 EP 0309382B1
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EP
European Patent Office
Prior art keywords
contact lever
contact
carrier
lever
stop surface
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
EP88730198A
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German (de)
French (fr)
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EP0309382A1 (en
Inventor
Martin Dipl.-Ing. Böttcher
Karl-Heinz Ing.(Grad.) Manthe
Bernhard Dr.-Ing. Pfeiffer
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Siemens AG
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Siemens AG
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Publication of EP0309382A1 publication Critical patent/EP0309382A1/en
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Publication of EP0309382B1 publication Critical patent/EP0309382B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal

Definitions

  • the invention relates to a contact arrangement of a low-voltage circuit breaker with an electrodynamic opening, with a pivotably mounted contact lever carrier and a contact lever mounted thereon and pivotably mounted relative to this, and a compression spring which is supported on the contact lever carrier and the contact lever for biasing the contact lever into the closed position or after exceeding a dead center position of the contact lever with respect to the direction of action of the compression spring in an open position, further with an effective stop surface for a back surface of the contact lever in the open position of the contact lever and a further stop surface provided on the contact lever carrier for the closed position of the contact lever.
  • a contact arrangement of this type is known from GB-A-1 564 412.
  • the pivot bearing for the contact lever on the contact lever carrier has the shape of a hinge pin, as is also common with movable contact arrangements of low-voltage circuit breakers of a different type.
  • the invention has for its object the structure of the contact lever, the To simplify the contact lever carrier and the compression spring existing assembly to the extent that the assembly of these parts can be dispensed with using a complex assembly device and that a high degree of strength against the stresses is achieved when the contact lever is opened dynamically.
  • the pivot bearing of the contact lever on the contact lever carrier is formed by a pan-like recess of the contact lever carrier and an extension of the contact lever engaging in the recess, that the stop surface for the open position of the contact lever is arranged on the contact lever carrier and below is arranged at an acute angle to the stop surface for the closed position of the contact lever and that the stop surface for the open position of the contact lever and the pan-like depression are connected by a continuous transition surface, the contact lever between the extension and the back surface having a transition part adapted to the transition surface .
  • a pan-like mounting of a contact lever on a contact lever carrier is already known from FR-A-2 553 930.
  • the bearing is formed by the end of the contact lever and a corresponding prismatic recess in the contact lever carrier.
  • the extension of the contact lever enables the automatic engagement of the contact lever in the contact lever carrier.
  • the acute angle between the stop surface for the open position and the stop surface for the closed position gives the contact lever carrier an approximately funnel-like opening into which the contact lever is to be inserted for assembly.
  • the steady transition surface ensures that when the contact lever is inserted into the contact lever carrier it first comes into force-free engagement with the compression spring and then with its extension on the stop surface and slides along the transition surface, the compression spring being tensioned. Then the peg-like extension of the contact lever automatically passes into the pan-like recess of the contact lever carrier.
  • the continuous transition surface in conjunction with the adapted transition part of the contact lever ensures a flat contact in the end position with electrodynamically caused contact opening, as a result of which the stress on the interacting parts is advantageously low.
  • the contact lever carrier is a pocket-like part which is essentially open on one side.
  • a movable electrical connection of the contact lever to a stationary connection point is achieved by a current band which is attached to an extension of the contact lever and which is guided around the outside of the contact lever carrier in an arc.
  • both a shape of the contact lever carrier which is more favorable for the production and a configuration which is advantageous for the current band can be achieved in that the contact lever carrier near the pan-like depression on its side facing away from the stop faces for the passage of a current band connected to the contact lever Opening.
  • the contact lever carrier is given a rather frame-like shape with a through opening instead of the previous pocket-like shape.
  • the current band is thereby shorter and can be connected to the contact lever where a relatively small relative movement occurs.
  • FIG. 1 shows a side view of a contact arrangement according to the invention, a contact lever carrier being shown in section.
  • FIG. 2 shows a three-pole embodiment of a contact arrangement in a top view.
  • the contact arrangement of a low-voltage circuit breaker shown in FIG. 1 and designated as a whole by 1 has a contact lever 2 with a contact piece 3 located at its front end and a fixed, loop-shaped conductor 4 with a further contact 5.
  • the contact lever 2 is pivotally mounted in a contact lever carrier 6, the contact lever carrier 6 in turn being pivotally supported in a known manner in a circuit breaker housing, not shown.
  • the contact lever 2 is designed as a two-armed lever with lever parts 7 and 8, of which the lever part 7 provided with the contact piece 3 is formed substantially longer than the rear lever part 8, on which a flexible current band 11 is attached for connecting the contact lever 2 to a fixed connection point is.
  • the pivot bearing of the contact lever 2 is formed by a rounded extension 12 which engages in a pan-like recess 13 of the contact lever carrier 6 which is adapted to the rounding of the extension.
  • the contact lever carrier 6 has a bottom part 14, which serves as a relatively stationary abutment of a helical compression spring 15 which engages on the contact lever 2 by means of a pressure piece 16.
  • a pressure piece 16 To engage the pressure piece on the contact lever 2, its lever part 8 is provided with a suitable recess 17.
  • the compression spring 15 acts on the lever part 8 of the contact lever 2 in such a way that it strives to extend it 12 to perform a counterclockwise rotation. In this way, the contact force required to make contact between the contact pieces 3 and 5 is generated when the contact lever carrier 6 is biased counterclockwise. This is done by means of a conventional drive mechanism, for example formed from toggle levers 20 and 21, which engages on a bearing pin 22 passing through the contact lever carrier.
  • the contact lever 2 When the contact lever carrier 6 is in the unchanged position, the contact lever 2 can be moved by a relatively large swivel angle in that the contact lever carrier has a correspondingly dimensioned opening 23 which is delimited by stop faces 24 and 25.
  • a lower edge 10 of the contact lever 2 In the switch-on position shown, a lower edge 10 of the contact lever 2 is raised from the lower stop surface 24, as a result of which the compression spring 15 is effective for generating the contact force between the contact pieces 3 and 5.
  • the contact lever 2 In the open position shown in dashed lines, the contact lever 2 comes under the influence of electrodynamic forces which arise between the lever part 7 and the loop-shaped conductor 4 at a sufficiently high current.
  • the contact lever 2 is thrown away by the conductor 4, the direction of action of the compression spring 15 passing through a dead center position with respect to the bearing point formed by the extension 12 and the recess 13 and then being effective in the sense of the further opening of the contact lever 2.
  • the contact lever 2 then rests with a back surface 26 of the lever part 7 on the stop surface 25 of the contact lever carrier 6.
  • a continuously extending transition surface 27 is provided between the stop surface and the recess 13 of the contact lever support 6 and the contact lever 2 between the extension 12 and the back surface 26 has a correspondingly shaped transition part 30, there is a relatively large-area contact between the contact lever 2 and the contact lever carrier 6 and thus to an advantageously low mechanical stress during the electrodynamic opening process.
  • a current band 11 is fastened to the lever part 8 of the contact lever 2. This extends through a rear opening 31 of the contact lever carrier 6 and is in a favorable position with respect to the bearing of the contact lever 2 formed by the extension 12 and the recess 13. Furthermore, the current band 11 is so far away from the contacts 3 and 5 that an adverse effect of the heat of an arc is excluded.
  • the contact lever carrier 6 Due to the arrangement of the openings 23 and 31, the contact lever carrier 6 has an approximately frame-like shape, the contact lever 2 being accommodated between side walls 32.
  • the rear of the two side walls 32 is visible due to the selected sectional view.
  • These side walls 32 are connected by two cross legs 33 and 34, of which the upper cross leg 33 has the stop surface 25 and the transition surface 27 and the recess 13 and the cross leg 34 has the stop surface 24 and the bottom part 14.
  • FIG. 2 according to the number of poles of a switching device, several contact lever carriers 6 with shaft-like sections 35 can form a multi-pole switching shaft 36 connected, which is pivotally mounted in the housing of a switching device.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Description

Die Erfindung betrifft eine Kontaktanordnung eines Niederspannungs-Leistungsschalters mit elektrodynamischer Öffnung, mit einem schwenkbar gelagerten Kontakthebelträger und einem daran angebrachten und relativ zu diesem schwenkbar gelagerten Kontakthebel sowie einer sich an dem Kontakthebelträger und dem Kontakthebel abstützenden Druckfeder zur Vorspannung des Kontakthebels in die Schließlage oder nach Überschreiten einer Totpunktstellung des Kontakthebels bezüglich der Wirkungsrichtung der Druckfeder in eine geöffnete Stellung, ferner mit einer in der geöffneten Stellung des Kontakthebels wirksamen Anschlagfläche für eine Rückenfläche des Kontakthebels und einer an dem Kontakthebelträger vorgesehenen weiteren Anschlagfläche für die geschlossene Stellung des Kontakthebels.The invention relates to a contact arrangement of a low-voltage circuit breaker with an electrodynamic opening, with a pivotably mounted contact lever carrier and a contact lever mounted thereon and pivotably mounted relative to this, and a compression spring which is supported on the contact lever carrier and the contact lever for biasing the contact lever into the closed position or after exceeding a dead center position of the contact lever with respect to the direction of action of the compression spring in an open position, further with an effective stop surface for a back surface of the contact lever in the open position of the contact lever and a further stop surface provided on the contact lever carrier for the closed position of the contact lever.

Eine Kontaktanordnung dieser Art ist durch die GB-A-1 564 412 bekannt geworden. Hierbei hat das Schwenklager für den Kontakthebel an dem Kontakthebelträger die Gestalt eines Gelenkbolzens, wie dies auch bei bewegbaren Kontaktanordnungen von Niederspannungs-Leistungsschaltern anderer Art üblich ist. Beim Zusammenbau der bewegbaren Kontaktanordnung ist es somit erforderlich, eine Bohrung des Kontakthebels und entsprechende Bohrungen in dem Kontakthebelträger fluchtend gegeneinander auszurichten, um den Gelenkbolzen einsetzen zu können. Dieser Vorgang ist dadurch erschwert, daß die Ausrichtung der Teile gegen die Kraft der Druckfeder vorgenommen werden muß, sofern nicht eine verhältnismäßig aufwendige Gestaltung des Kontakthebelträgers vorgesehen wird, die es gestattet, die Druckfeder nach der Herstellung der gelenkigen Verbindung des Kontakthebels und des Kontakthebelträgers einzusetzen.A contact arrangement of this type is known from GB-A-1 564 412. Here, the pivot bearing for the contact lever on the contact lever carrier has the shape of a hinge pin, as is also common with movable contact arrangements of low-voltage circuit breakers of a different type. When assembling the movable contact arrangement, it is therefore necessary to align a bore of the contact lever and corresponding bores in the contact lever carrier with one another in order to be able to use the hinge pin. This process is complicated by the fact that the alignment of the parts must be carried out against the force of the compression spring, unless a relatively complex design of the contact lever carrier is provided, which allows the compression spring to be used after the articulated connection of the contact lever and the contact lever carrier has been established.

Der Erfindung liegt die Aufgabe zugrunde, den Aufbau der aus dem Kontakthebel, dem Kontakthebelträger und der Druckfeder bestehenden Baugruppe soweit zu vereinfachen, daß beim Zusammenbau dieser Teile von der Verwendung einer aufwendigen Montagevorrichtung abgesehen werden kann und daß ein hohes Maß an Festigkeit gegenüber den Beanspruchungen bei dynamischer Öffnung des Kontakthebels erzielt wird.The invention has for its object the structure of the contact lever, the To simplify the contact lever carrier and the compression spring existing assembly to the extent that the assembly of these parts can be dispensed with using a complex assembly device and that a high degree of strength against the stresses is achieved when the contact lever is opened dynamically.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß daß Schwenklager des Kontakthebels an dem Kontakthebelträger durch eine pfannenartige Vertiefung des Kontakthebelträgers sowie einen in die Vertiefung eingreifenden Fortsatz des Kontakthebels gebildet ist, daß die Anschlagfläche für die geöffnete Stellung des Kontakthebels an dem Kontakthebelträger angeordnet und unter einem spitzen Winkel zu den Anschlagfläche für die geschlossene Stellung des Kontakthebels angeordnet ist und daß die Anschlagfläche für die geöffnete Stellung des Kontakthebels und die pfannenartige Vertiefung durch eine stetige Übergangsfläche verbunden sind, wobei der Kontakthebel zwischen dem Fortsatz und der Rückenfläche einen der Übergangsfläche angepaßten Übergangsteil besitzt.This object is achieved according to the invention in that the pivot bearing of the contact lever on the contact lever carrier is formed by a pan-like recess of the contact lever carrier and an extension of the contact lever engaging in the recess, that the stop surface for the open position of the contact lever is arranged on the contact lever carrier and below is arranged at an acute angle to the stop surface for the closed position of the contact lever and that the stop surface for the open position of the contact lever and the pan-like depression are connected by a continuous transition surface, the contact lever between the extension and the back surface having a transition part adapted to the transition surface .

Eine pfannenartige Lagerung eines Kontakthebels an einem Kontakthebelträger ist bereits durch die FR-A-2 553 930 bekannt geworden. Hierbei wird das Lager durch das Ende des Kontakthebels und eine entsprechende prismatische Ausnehmung des Kontakthebelträgers gebildet.A pan-like mounting of a contact lever on a contact lever carrier is already known from FR-A-2 553 930. Here, the bearing is formed by the end of the contact lever and a corresponding prismatic recess in the contact lever carrier.

Demgegenüber ermöglicht es der nach der Erfindung vorgesehene Fortsatz des Kontakthebels, den selbsttätigen Eingriff des Kontakthebels in den Kontakthebelträger herbeizuführen. Durch den spitzen Winkel zwischen der Anschlagfläche für die Öffnungsstellung und der Anschlagfläche für die Schließstellung erhält der Kontakthebelträger eine etwa trichterartige Öffnung, in welche der Kontakthebel zur Montage einzuführen ist. Durch die stetige Übergangsfläche wird erreicht, daß der Kontakthebel beim Einsetzen in den Kontakthebelträger zunächst kräftefrei mit der Druckfeder in Eingriff gelangt und dann mit seinem Fortsatz an der Anschlagfläche und der Übergangsfläche entlang gleitet, wobei die Druckfeder gespannt wird. Dann tritt selbsttägig der zapfenartige Fortsatz des Kontakthebels in die pfannenartige Vertiefung des Kontakthebelträgers über. Zugleich sorgt die stetige Übergangsfläche in Verbindung mit dem angepaßten Übergangsteil des Kontakthebels für eine flächenhafte Anlage in der Endstellung bei elektrodynamisch bewirkter Kontaktöffnung, wodurch die Beanspruchung der zusammenwirkenden Teile vorteilhaft niedrig ist.In contrast, the extension of the contact lever provided according to the invention enables the automatic engagement of the contact lever in the contact lever carrier. The acute angle between the stop surface for the open position and the stop surface for the closed position gives the contact lever carrier an approximately funnel-like opening into which the contact lever is to be inserted for assembly. The steady transition surface ensures that when the contact lever is inserted into the contact lever carrier it first comes into force-free engagement with the compression spring and then with its extension on the stop surface and slides along the transition surface, the compression spring being tensioned. Then the peg-like extension of the contact lever automatically passes into the pan-like recess of the contact lever carrier. At the same time, the continuous transition surface in conjunction with the adapted transition part of the contact lever ensures a flat contact in the end position with electrodynamically caused contact opening, as a result of which the stress on the interacting parts is advantageously low.

Bei der eingangs erwähnten bekannten Kontakthebelanordnung ist der Kontakthebelträger ein im wesentlichen einseitig offenes, taschenartiges Teil. Eine bewegliche elektrische Verbindung des Kontakthebels mit einer ortsfesten Anschlußstelle wird dabei durch ein Stromband erreicht, das an einem Fortsatz des Kontakthebels angebracht ist und das um den Kontakthebelträger außen in einem Bogen herumgeführt ist. Nach einer weiteren Ausgestaltung der Erfindung kann sowohl eine für die Herstellung günstigere Gestalt des Kontakthebelträgers als auch eine für das Stromband vorteilhafte Gestaltung dadurch erreicht werden, daß der Kontakthebelträger nahe der pfannenartigen Vertiefung an seiner den Anschlagflächen abgewandten Seite zum Durchtritt eines mit dem Kontakthebel verbundenen Strombandes eine Öffnung besitzt. Der Kontakthebelträger erhält hierdurch anstelle der bisherigen taschenartigen Gestalt eine eher rahmenartige Form mit einer Durchgangsöffnung. Das Stromband wird hierdurch kürzer und läßt sich dort mit dem Kontakthebel verbinden, wo eine verhältnismäßig geringe Relativbewegung auftritt.In the known contact lever arrangement mentioned at the outset, the contact lever carrier is a pocket-like part which is essentially open on one side. A movable electrical connection of the contact lever to a stationary connection point is achieved by a current band which is attached to an extension of the contact lever and which is guided around the outside of the contact lever carrier in an arc. According to a further embodiment of the invention, both a shape of the contact lever carrier which is more favorable for the production and a configuration which is advantageous for the current band can be achieved in that the contact lever carrier near the pan-like depression on its side facing away from the stop faces for the passage of a current band connected to the contact lever Opening. As a result, the contact lever carrier is given a rather frame-like shape with a through opening instead of the previous pocket-like shape. The current band is thereby shorter and can be connected to the contact lever where a relatively small relative movement occurs.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert.The invention is explained below with reference to the embodiment shown in the figures.

In der Figur 1 ist eine Kontaktanordnung nach der Erfindung in einer Seitenansicht dargestellt, wobei ein Kontakthebelträger geschnitten gezeigt ist.1 shows a side view of a contact arrangement according to the invention, a contact lever carrier being shown in section.

Die Figur 2 zeigt eine dreipolige Ausführung einer Kontaktanordnung in der Draufsicht.FIG. 2 shows a three-pole embodiment of a contact arrangement in a top view.

Die in der Figur 1 gezeigte und als Ganzes mit 1 bezeichnete Kontaktanordnung eines Niederspannungs-Leistungsschalters weist einen Kontakthebel 2 mit einem an seinem vorderen Ende befindlichen Kontaktstück 3 sowie einen feststehenden, schleifenförmigen Leiter 4 mit einem weiteren Kontakt 5 auf. Der Kontakthebel 2 ist schwenkbar in einem Kontakthebelträger 6 gelagert, wobei der Kontakthebelträger 6 seinerseits in bekannter Weise in einem nicht dargestellten Gehäuse eines Leistungsschalters schwenkbar gelagert ist. Der Kontakthebel 2 ist als zweiarmiger Hebel mit Hebelteilen 7 und 8 ausgebildet, von denen der mit dem Kontaktstück 3 versehene Hebelteil 7 wesentlich länger als der rückwärtige Hebelteil 8 ausgebildet ist, an dem ein biegsames Stromband 11 zur Verbindung des Kontakthebels 2 mit einer ortsfesten Anschlußstelle angebracht ist. Das Schwenklager des Kontakthebels 2 wird durch einen abgerundeten Fortsatz 12 gebildet, der in eine pfannenartige der Abrundung des Fortsatzes angepaßte Ausnehmung 13 des Kontakthebelträgers 6 eingreift.The contact arrangement of a low-voltage circuit breaker shown in FIG. 1 and designated as a whole by 1 has a contact lever 2 with a contact piece 3 located at its front end and a fixed, loop-shaped conductor 4 with a further contact 5. The contact lever 2 is pivotally mounted in a contact lever carrier 6, the contact lever carrier 6 in turn being pivotally supported in a known manner in a circuit breaker housing, not shown. The contact lever 2 is designed as a two-armed lever with lever parts 7 and 8, of which the lever part 7 provided with the contact piece 3 is formed substantially longer than the rear lever part 8, on which a flexible current band 11 is attached for connecting the contact lever 2 to a fixed connection point is. The pivot bearing of the contact lever 2 is formed by a rounded extension 12 which engages in a pan-like recess 13 of the contact lever carrier 6 which is adapted to the rounding of the extension.

Der Kontakthebelträger 6 weist ein Bodenteil 14 auf, das als relativ ortsfestes Widerlager einer schraubenförmigen Druckfeder 15 dient, die mittels eines Druckstückes 16 an dem Kontakthebel 2 angreift. Zum Angriff des Druckstückes an dem Kontakthebel 2 ist dessen Hebelteil 8 mit einer passenden Ausnehmung 17 versehen. Wie aus der Figur 1 zu ersehen ist, wirkt die Druckfeder 15 derart auf den Hebelteil 8 des Kontakthebels 2 ein, daß dieser bestrebt ist, um seinen Fortsatz 12 eine Schwenkung entgegen dem Uhrzeigersinn auszuführen. Auf diese Weise wird die zur Kontaktgabe erforderliche Kontaktkraft zwischen den Kontaktstücken 3 und 5 erzeugt, wenn der Kontakthebelträger 6 entgegen dem Uhrzeigersinn vorgespannt wird. Dies geschieht durch einen üblichen, beispielsweise aus Kniehebeln 20 und 21 gebildeten Antriebsmechanismus, der an einem den Kontakthebelträger durchsetzenden Lagerbolzen 22 angreift.The contact lever carrier 6 has a bottom part 14, which serves as a relatively stationary abutment of a helical compression spring 15 which engages on the contact lever 2 by means of a pressure piece 16. To engage the pressure piece on the contact lever 2, its lever part 8 is provided with a suitable recess 17. As can be seen from FIG. 1, the compression spring 15 acts on the lever part 8 of the contact lever 2 in such a way that it strives to extend it 12 to perform a counterclockwise rotation. In this way, the contact force required to make contact between the contact pieces 3 and 5 is generated when the contact lever carrier 6 is biased counterclockwise. This is done by means of a conventional drive mechanism, for example formed from toggle levers 20 and 21, which engages on a bearing pin 22 passing through the contact lever carrier.

Der Kontakthebel 2 ist bei unveränderter Stellung des Kontakthebelträgers 6 um einen relativ großen Schwenkwinkel dadurch beweglich, daß der Kontakthebelträger eine entsprechend bemessene Öffnung 23 besitzt, die von Anschlagflächen 24 und 25 begrenzt ist. In der gezeigten Einschaltstellung ist eine Unterkante 10 des Kontakthebels 2 von der unteren Anschlagfläche 24 abgehoben, wodurch die Druckfeder 15 zur Erzeugung der Kontaktkraft zwischen den Kontaktstücken 3 und 5 wirksam ist. In die gestrichelt gezeigte Öffnungsstellung gelangt der Kontakthebel 2 unter dem Einfluß elektrodynamischer Kräfte, die zwischen dem Hebelteil 7 und dem schleifenförmigen Leiter 4 bei ausreichend hoher Stromstärke entstehen. In diesem Fall wird der Kontakthebel 2 von dem Leiter 4 fortgeschleudert, wobei die Wirkungsrichtung der Druckfeder 15 bezüglich der durch den Fortsatz 12 und die Vertiefung 13 gebildeten Lagerstelle eine Totpunktstellung durchläuft und anschließend im Sinne der weiteren Öffnung des Kontakthebels 2 wirksam wird. Der Kontakthebel 2 legt sich dann mit einer Rückenfläche 26 des Hebelteiles 7 an der Anschlagfläche 25 des Kontakthebelträgers 6 an. Dadurch, daß zwischen der Anschlagfläche und der Vertiefung 13 des Kontakthebelträgers 6 eine stetig verlaufende Übergangsfläche 27 vorgesehen ist und der Kontakthebel 2 zwischen dem Fortsatz 12 und der Rückenfläche 26 einen entsprechend geformten Übergangsteil 30 aufweist, kommt es zu einer relativ großflächigen Berührung zwischen dem Kontakthebel 2 und dem Kontakthebelträger 6 und damit zu einer vorteilhaft niedrigen mechanischen Beanspruchung bei dem elektrodynamischen Öffnungsvorgang.When the contact lever carrier 6 is in the unchanged position, the contact lever 2 can be moved by a relatively large swivel angle in that the contact lever carrier has a correspondingly dimensioned opening 23 which is delimited by stop faces 24 and 25. In the switch-on position shown, a lower edge 10 of the contact lever 2 is raised from the lower stop surface 24, as a result of which the compression spring 15 is effective for generating the contact force between the contact pieces 3 and 5. In the open position shown in dashed lines, the contact lever 2 comes under the influence of electrodynamic forces which arise between the lever part 7 and the loop-shaped conductor 4 at a sufficiently high current. In this case, the contact lever 2 is thrown away by the conductor 4, the direction of action of the compression spring 15 passing through a dead center position with respect to the bearing point formed by the extension 12 and the recess 13 and then being effective in the sense of the further opening of the contact lever 2. The contact lever 2 then rests with a back surface 26 of the lever part 7 on the stop surface 25 of the contact lever carrier 6. Characterized in that a continuously extending transition surface 27 is provided between the stop surface and the recess 13 of the contact lever support 6 and the contact lever 2 between the extension 12 and the back surface 26 has a correspondingly shaped transition part 30, there is a relatively large-area contact between the contact lever 2 and the contact lever carrier 6 and thus to an advantageously low mechanical stress during the electrodynamic opening process.

Die beschriebene Gestaltung des Kontakthebelträgers 6 mit einer Anschlagfläche 25 und einer sich von der Anschlagfläche bis zu der pfannenartigen Vertiefung 13 erstreckenden stetigen Übergangsfläche 27 führt ferner zu einer besonders einfachen Montage des Kontakthebels 2 an dem Kontakthebelträger 6. Hierzu wird der Kontakthebel 2 in die durch die Anschlagflächen 24 und 25 begrenzte trichterartige Öffnung 23 eingeführt, wobei zunächst die Ausnehmung 17 mit dem Druckstück 16 der Druckfeder 15 kräftefrei in Verbindung tritt. Wird nun der Kontakthebel 2 weiter in die Öffnung 23 hineingedrückt, so wird mit verhältnismäßig geringem Kraftaufwand die Druckfeder 15 aufgrund der Keilwirkung gespannt, bis der Fortsatz 12 unter teilweiser Entspannung der Druckfeder 15 in die Ausnehmung 13 hineingelangt.The described design of the contact lever carrier 6 with a stop surface 25 and a continuous transition surface 27 extending from the stop surface to the pan-like recess 13 also leads to a particularly simple assembly of the contact lever 2 on the contact lever carrier 6 Stop faces 24 and 25 limited funnel-like opening 23 are introduced, the recess 17 first connecting with the pressure piece 16 of the compression spring 15 without force. If the contact lever 2 is now pushed further into the opening 23, the compression spring 15 is tensioned with relatively little force due to the wedge effect until the extension 12 reaches the recess 13 with partial relaxation of the compression spring 15.

Wie bereits erwähnt, ist an dem Hebelteil 8 des Kontakthebels 2 ein Stromband 11 befestigt. Dieses erstreckt sich durch eine rückseitige Öffnung 31 des Kontakthebelträgers 6 und befindet sich dabei in einer günstigen Lage bezüglich des durch den Fortsatz 12 und die Vertiefung 13 gebildeten Lagerung des Kontakthebels 2. Ferner ist das Stromband 11 so weit von den Kontakten 3 und 5 entfernt, daß eine nachteilige Einwirkung der Wärme eines Lichtbogens ausgeschlossen ist.As already mentioned, a current band 11 is fastened to the lever part 8 of the contact lever 2. This extends through a rear opening 31 of the contact lever carrier 6 and is in a favorable position with respect to the bearing of the contact lever 2 formed by the extension 12 and the recess 13. Furthermore, the current band 11 is so far away from the contacts 3 and 5 that an adverse effect of the heat of an arc is excluded.

Aufgrund der Anordnung der Öffnungen 23 und 31 besitzt der Kontakthebelträger 6 eine etwa rahmenartige Gestalt, wobei der Kontakthebel 2 zwischen Seitenwänden 32 aufgenommen ist. In der Figur 1 ist aufgrund der gewählten Schnittdarstellung die hintere der beiden Seitenwände 32 sichtbar. Diese Seitenwände 32 sind durch zwei Querschenkel 33 und 34 verbunden, von denen der obere Querschenkel 33 die Anschlagfläche 25 sowie die Übergangsfläche 27 und die Vertiefung 13 aufweist und der Querschenkel 34 die Anschlagfläche 24 und den Bodenteil 14 aufweist. Wie aus der Figur 2 zu entnehmen ist, können entsprechend der Polzahl eines Schaltgerätes mehrere Kontakthebelträger 6 mit wellenartigen Abschnitten 35 zu einer mehrpoligen Schaltwelle 36 verbunden sein, die in dem Gehäuse eines Schaltgerätes schwenkbar gelagert ist. Auf diese Weise wird die normale Ein-und Ausschaltung bewirkt, bei welcher der bzw. die Kontakthebel 2 in dem zugehörigen Kontakthebelträger 6 ihre Stellung im wesentlichen beibehalten. Es legt sich lediglich beim Ausschalten die Unterkante 10 des Hebelteiles 7 des Kontakthebels 2 an die Anschlagfläche 24 des Kontakthebelträgers 6 an.Due to the arrangement of the openings 23 and 31, the contact lever carrier 6 has an approximately frame-like shape, the contact lever 2 being accommodated between side walls 32. In Figure 1, the rear of the two side walls 32 is visible due to the selected sectional view. These side walls 32 are connected by two cross legs 33 and 34, of which the upper cross leg 33 has the stop surface 25 and the transition surface 27 and the recess 13 and the cross leg 34 has the stop surface 24 and the bottom part 14. As can be seen from FIG. 2, according to the number of poles of a switching device, several contact lever carriers 6 with shaft-like sections 35 can form a multi-pole switching shaft 36 connected, which is pivotally mounted in the housing of a switching device. In this way, the normal switching on and off is effected, in which the contact lever (s) 2 in the associated contact lever carrier 6 essentially maintain their position. The lower edge 10 of the lever part 7 of the contact lever 2 only bears against the stop surface 24 of the contact lever carrier 6 when it is switched off.

Claims (2)

  1. Contact arrangement (1) in a low voltage-circuit breaker, having electrodynamic opening, having a pivotably mounted contact lever carrier (6) and a contact lever (2) fitted to this and mounted pivotably relative to it, as well as a compression spring (15) supported on the contact lever carrier (6) and the contact lever (2) for prestressing the contact lever (2) into the closing position or, when a dead centre position of the contact lever (2) with respect to the effective direction of the compression spring (15) has been exceeded, into an open position, further having a stop surface (25), for a rear surface (26) of the contact lever (2), effective in the open position of the contact lever (2), and having a stop surface (24), for the closed position of the contact lever (2), provided on the contact lever carrier (6), characterised in that the pivot bearing of the contact lever (2) is formed on the contact lever carrier (6) by a pan-like depression (13) in the contact lever carrier (6) and an extension (12) of the contact lever (2) engaging into the depression (13), in that the stop surface (25) for the open position of the contact lever (2) is arranged on the contact lever carrier (6) and is arranged at an acute angle to the stop surface (25) (sic) for the closed position of the contact lever (2), and in that the stop surface (25) for the open position of the contact lever (2) and the pan-like depression (13) are connected by a fixed transition surface (27), the contact lever (2) between the extension (12) and the rear surface (26) having a transition part (30) adapted to the transition surface (27).
  2. Contact arrangement according to claim 1, characterised in that the contact lever carrier (2) near the pan-like depression (13) has an aperture (31) on its side remote from the stop surfaces (24, 25) for the passage of a flexible connector (11) connected to the contact lever (2).
EP88730198A 1987-09-23 1988-09-05 Contact arrangement for a low-voltage circuit breaker with an electrodynamic opening Expired - Lifetime EP0309382B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3732468 1987-09-23
DE19873732468 DE3732468A1 (en) 1987-09-23 1987-09-23 CONTACT ARRANGEMENT OF A LOW VOLTAGE CIRCUIT BREAKER WITH ELECTRODYNAMIC OPENING

Publications (2)

Publication Number Publication Date
EP0309382A1 EP0309382A1 (en) 1989-03-29
EP0309382B1 true EP0309382B1 (en) 1993-07-14

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ID=6336942

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Application Number Title Priority Date Filing Date
EP88730198A Expired - Lifetime EP0309382B1 (en) 1987-09-23 1988-09-05 Contact arrangement for a low-voltage circuit breaker with an electrodynamic opening

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Country Link
US (1) US4845459A (en)
EP (1) EP0309382B1 (en)
DE (2) DE3732468A1 (en)

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DE10137506C1 (en) * 2001-07-26 2002-08-08 Siemens Ag Switch contact arrangement for an electrical switch

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US5023416A (en) * 1989-10-03 1991-06-11 Fuji Electric Co., Ltd. Circuit breaker
DE4103584A1 (en) * 1990-02-09 1991-08-22 Fuji Electric Co Ltd Small line of earthing switch with coupling conductor on frame - has flexible conductive wire as parallel connection for movable contact and coupling conductor
DE4211916A1 (en) * 1992-04-09 1993-10-14 Abb Patent Gmbh Installation device
FR2703824B1 (en) * 1993-04-07 1995-05-12 Merlin Gerin Multipolar limiter circuit breaker with electrodynamic repulsion.
US5363076A (en) * 1993-04-28 1994-11-08 Square D Company Circuit breaker having spring biased blade suspension
DE4416104C2 (en) * 1994-04-19 2000-07-13 Siemens Ag Switch contact arrangement of an electrical circuit breaker
US5844188A (en) * 1996-12-19 1998-12-01 Siemens Energy & Automation, Inc. Circuit breaker with improved trip mechanism
IT1289482B1 (en) * 1996-12-20 1998-10-15 Sace Spa CURRENT SWITCH WITH MOVABLE CONTACTS
US5874699A (en) * 1997-09-18 1999-02-23 Eaton Corporation Molded case circuit breaker and moving conductor assembly therefor
DE10144105C1 (en) * 2001-09-03 2003-04-17 Siemens Ag Switch contact arrangement with a spring force acting in the closing direction and in the opening direction
US6747532B1 (en) 2002-12-23 2004-06-08 General Electric Company Method, system and apparatus for employing neutral poles in multipole circuit breakers

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GB1564412A (en) * 1977-09-15 1980-04-10 Dorman Smith Switchgear Ltd Electric circuit breakers
FR2553930B1 (en) * 1983-10-21 1986-05-09 Merlin Gerin REVERSIBLE MECHANISM FOR CONTROLLING A MULTIPOLAR LIMITING CIRCUIT BREAKER
US4635011A (en) * 1985-05-01 1987-01-06 Westinghouse Electric Corp. Circuit breaker with arm latch for high interrupting capacity
US4642431A (en) * 1985-07-18 1987-02-10 Westinghouse Electric Corp. Molded case circuit breaker with a movable electrical contact positioned by a camming spring loaded clip

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DE10137506C1 (en) * 2001-07-26 2002-08-08 Siemens Ag Switch contact arrangement for an electrical switch

Also Published As

Publication number Publication date
DE3732468A1 (en) 1989-04-06
DE3882318D1 (en) 1993-08-19
EP0309382A1 (en) 1989-03-29
US4845459A (en) 1989-07-04

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