EP0309382A1 - 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
EP0309382A1
EP0309382A1 EP88730198A EP88730198A EP0309382A1 EP 0309382 A1 EP0309382 A1 EP 0309382A1 EP 88730198 A EP88730198 A EP 88730198A EP 88730198 A EP88730198 A EP 88730198A EP 0309382 A1 EP0309382 A1 EP 0309382A1
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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.)
Granted
Application number
EP88730198A
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German (de)
French (fr)
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EP0309382B1 (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
Application granted granted Critical
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 attached to it and pivotably mounted relative to this, and a compression spring 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 kind 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.
  • 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.
  • 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.
  • the pivot bearing of the contact lever on the contact lever carrier is formed by a pan-like depression of the contact lever carrier and an extension of the contact lever engaging in the recess and in that the stop surface for the open position of the contact lever is arranged on the contact lever carrier.
  • the invention is based on the consideration that, in order to form a pivot bearing with a limited pivot angle, it is not necessary to provide a shaft or bolt bearing suitable for rotating movements.
  • the cohesion of the parts which can be pivoted relative to one another is namely ensured by the force of the compression spring, which in this way performs a triple function.
  • This consists firstly of maintaining the cohesion between the contact lever and the contact lever carrier, secondly of generating a contact force between the contact lever and a stationary counter-contact cooperating therewith in the closed position of the contact arrangement and thirdly of the sudden transfer to an open position with the position unchanged of the contact lever carrier under the influence of an electrodynamic force. Due to the self-centering property of a pan bearing, it is therefore sufficient to bring the contact lever with its extension into the vicinity of the recess of the contact lever carrier and thus to bring about the automatic engagement of both parts.
  • the stop surface for the back surface of the contact lever serves as a sliding surface for guiding the contact lever.
  • the stop surface for the closed position of the contact lever is arranged at an acute angle to the stop surface for the open position of the contact lever.
  • the two stop surfaces here form an approximately funnel-like opening of the contact lever carrier into which the contact lever is to be inserted for assembly.
  • the stop surface for the open position of the contact lever and the pan-like depression are connected by a continuous transition surface. This ensures that the contact lever, when inserted into the contact lever carrier, first comes into engagement with the compression spring without force and then slides with its extension along the stop surface and the transition surface, the compression spring being tensioned. Then the pin-like extension of the contact lever automatically passes into the pan-like recess of the contact lever carrier.
  • 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 fixed 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.
  • 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 keep it going set 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.
  • a conventional drive mechanism which is formed, for example, of toggle levers 20 and 21 and 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 located 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 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.
  • a plurality of contact lever supports 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)

Abstract

Bei Kontaktanordnungen, die eine Druckfeder zur Vorspannung eines Kontakthebels in die Schließlage oder nach Überschreiten einer Totpunktstellung in eine geöffnete Stellung enthalten, soll der Zusammenbau vereinfacht und die Verwendung einer Montagevorrichtung entbehrlich gemacht werden. Das Schwenklager eines Kontakthebels (2) an einem Kontakthebelträger (6) wird durch eine pfannenartige Vertiefung (13) des Kontakthebelträgers (6) sowie einen in die Vertiefung (13) eingreifenden Fortsatz (12) des Kontakthebels (2) gebildet. Ferner ist an dem Kontakthebelträger (6) eine Anschlagfläche (25) für die geöffnete Stellung des Kontakthebels (2) angeordnet. Zur Verbindung des Kontakthebels (2) mit dem Kontakthebelträger (6) genügt eine kurzzeitige Krafteinleitung. Strombegrenzende Niederspannungs-Leistungsschalter in Kompaktbauart (MCCB).In the case of contact arrangements which contain a compression spring for prestressing a contact lever in the closed position or in an open position after a dead center position has been exceeded, the assembly is to be simplified and the use of a mounting device is to be dispensed with. The pivot bearing of a contact lever (2) on a contact lever carrier (6) is formed by a pan-like recess (13) in the contact lever carrier (6) and an extension (12) of the contact lever (2) engaging in the recess (13). Furthermore, a stop surface (25) for the open position of the contact lever (2) is arranged on the contact lever carrier (6). A brief application of force is sufficient to connect the contact lever (2) to the contact lever carrier (6). Current-limiting low-voltage circuit breakers in compact design (MCCB).

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 attached to it and pivotably mounted relative to this, and a compression spring 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. 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.A contact arrangement of this kind 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. 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.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß das Schwenklager des Kontakthebels an dem Kontakthebelträger durch eine pfannenartige Vertiefung des Kontakthebelträgers sowie einen in die Vertiefung eingreifenden Fortsatz des Kon­takthebels gebildet ist und daß die Anschlagfläche für die geöffnete Stellung des Kontakthebels an dem Kontakthebelträger angeordnet ist. Die Erfindung beruht auf der Überlegung, daß es zur Bildung eines Schwenklagers mit einem begrenzten Schwenk­winkel nicht erforderlich ist, eine für umlaufende Drehbewe­gungen geeignete Wellen- oder Bolzenlagerung vorzusehen. Der Zusammenhalt der relativ zueinander schwenkbaren Teile wird nämlich durch die Kraft der Druckfeder gewährleistet, die auf diese Weise eine dreifache Funktion ausübt. Diese besteht erstens in der schon erwähnten Aufrechterhaltung des Zusammen­haltes zwischen dem Kontakthebel und dem Kontakthebelträger, zweitens in der Erzeugung einer Kontaktkraft zwischen dem Kontakthebel und einem hiermit zusammenwirkenden feststehenden Gegenkontakt in der geschlossenen Stellung der Kontaktanordnung und drittens in der schlagartigen Überführung in eine Öffnungs­stellung bei unveränderter Stellung des Kontakthebelträger unter dem Einfluß einer elektrodynamischen Kraft. Aufgrund der selbstzentrierenden Eigenschaft eines Pfannenlagers genügt es somit, den Kontakthebel mit seinem Fortsatz in die Nähe der Ausnehmung des Kontakthebelträgers zu bringen und damit den selbsttätigen Eingriff beider Teile herbeizuführen. Die An­schlagfläche für die Rückenfläche des Kontakthebels dient dabei als Gleitfläche zur Führung des Kontakthebels.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 depression of the contact lever carrier and an extension of the contact lever engaging in the recess and in that the stop surface for the open position of the contact lever is arranged on the contact lever carrier. The invention is based on the consideration that, in order to form a pivot bearing with a limited pivot angle, it is not necessary to provide a shaft or bolt bearing suitable for rotating movements. The cohesion of the parts which can be pivoted relative to one another is namely ensured by the force of the compression spring, which in this way performs a triple function. This consists firstly of maintaining the cohesion between the contact lever and the contact lever carrier, secondly of generating a contact force between the contact lever and a stationary counter-contact cooperating therewith in the closed position of the contact arrangement and thirdly of the sudden transfer to an open position with the position unchanged of the contact lever carrier under the influence of an electrodynamic force. Due to the self-centering property of a pan bearing, it is therefore sufficient to bring the contact lever with its extension into the vicinity of the recess of the contact lever carrier and thus to bring about the automatic engagement of both parts. The stop surface for the back surface of the contact lever serves as a sliding surface for guiding the contact lever.

Zur weiteren Erleichterung des Zusammenbaus von Kontakthebel­träger und Kontakthebel kann dadurch beigetragen werden, daß die Anschlagfläche für die Schließlage des Kontakthebels an dem Kontakthebelträger unter einen spitzen Winkel zu der Anschlagfläche für die Öffnungsstellung des Kontakthebels angeordnet ist. Die beiden Anschlagflächen bilden hierbei eine etwa trichterartige Öffnung des Kontakthebelträgers, in welche der Kontakthebel zur Montage einzuführen ist. Besonders günstig wirkt es sich in diesem Zusammenhang aus, wenn die Anschlag­fläche für die geöffnete Stellung des Kontakthebels und die pfannenartige Vertiefung durch eine stetige Übergangsfläche verbunden sind. Hierdurch ist zu erreichen, 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 entlanggleitet, wobei die Druckfeder gespannt wird. Dann tritt selbsttätig der zapfenartige Fortsatz des Kontakthebels in die pfannenartige Vertiefung des Kontakthebelträgers über.To further facilitate the assembly of the contact lever carrier and contact lever, it can be contributed that the stop surface for the closed position of the contact lever the contact lever carrier is arranged at an acute angle to the stop surface for the open position of the contact lever. The two stop surfaces here form an approximately funnel-like opening of the contact lever carrier into which the contact lever is to be inserted for assembly. In this context, it is particularly advantageous if the stop surface for the open position of the contact lever and the pan-like depression are connected by a continuous transition surface. This ensures that the contact lever, when inserted into the contact lever carrier, first comes into engagement with the compression spring without force and then slides with its extension along the stop surface and the transition surface, the compression spring being tensioned. Then the pin-like extension of the contact lever automatically passes into the pan-like recess of the contact lever carrier.

Bei der eingangs erwähnten bekannten Kontakthebelanordnung ist der Kontakthebelträger ein im wesentlichen einseitig offenes, taschenartigen 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 fixed 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.

  • In der Figur 1 ist eine Kontaktanordnung nach der Erfindung in einer Seitenansicht dargestellt, wobei ein Kontakthebelträger geschnitten gezeigt ist.
  • Die Figur 2 zeigt eine dreipolige Ausführung einer Kontaktan­ordnung in der Draufsicht.
The invention is explained below with reference to the embodiment shown in the figures.
  • 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.

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 Fort­ satz 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 keep it going set 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 a conventional drive mechanism, which is formed, for example, of toggle levers 20 and 21 and 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 located 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 Schalt­ welle 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, a plurality of contact lever supports 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 (4)

1. Kontaktanordnung (1) eines Niederspannungs-Leistungs­schalters mit elektrodynamischer Öffnung, mit einem schwenk­bar gelagerten Kontakthebelträger (6) und einem daran ange­brachten und relativ zu diesem schwenkbar gelagerten Kontakt­hebel (2) sowie einer sich an dem Kontakthebelträger (6) und dem Kontakthebel (2) abstützenden Druckfeder (15) zur Vor­spannung des Kontakthebels (2) in die Schließlage oder nach Überschreiten einer Totpunktstellung des Kontakthebels (2) bezüglich der Wirkungsrichtung der Druckfeder (15) in eine ge­öffnete Stellung, ferner mit einer in der geöffneten Stellung des Kontakthebels (2) wirksamen Anschlagfläche (25) für eine Rückenfläche (26) des Kontakthebels (2) und einer an dem Kontakthebelträger (6) vorgesehenen weiteren Anschlagfläche (24) für die geschlossene Stellung des Kontakthebels (2), dadurch gekennzeichnet, daß das Schwenklager des Kontakthebels (2) an dem Kontakthebelträger (6) durch eine pfannenartige Vertiefung (13) des Kontakthebelträgers (6) sowie einen in die Vertiefung (13) eingreifenden Fortsatz (12) des Kontakthebels (2) gebildet ist und daß die Anschlagfläche (25) für die geöffnete Stellung des Kontakthebels (2) an dem Kontakthebelträger (6) angeordnet ist.1.Contact arrangement (1) of a low-voltage circuit breaker with an electrodynamic opening, with a pivotably mounted contact lever carrier (6) and a contact lever (2) attached to it and pivotably mounted relative to this, and one on the contact lever carrier (6) and the contact lever (2 ) supporting compression spring (15) for pretensioning the contact lever (2) in the closed position or after exceeding a dead center position of the contact lever (2) with respect to the direction of action of the compression spring (15) in an open position, furthermore with one in the open position of the contact lever (2 ) effective stop surface (25) for a back surface (26) of the contact lever (2) and a further stop surface (24) provided on the contact lever carrier (6) for the closed position of the contact lever (2), characterized in that the pivot bearing of the contact lever ( 2) on the contact lever carrier (6) through a pan-like recess (13) of the contact lever carrier (6) and an extension (12) of the contact lever (2) engaging in the recess (13) is formed and that the stop surface (25) for the open position of the contact lever (2) is arranged on the contact lever carrier (6). 2. Kontaktanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Anschlagfläche (24) für die Schließlage des Kontakthebels (2) an dem Kontakthebelträger (6) unter einem spitzen Winkel zu der Anschlagfläche (25) für die Öffnungsstellung des Kontakthebels (2) angeordnet ist.2. Contact arrangement according to claim 1, characterized in that the stop surface (24) for the closed position of the contact lever (2) on the contact lever carrier (6) is arranged at an acute angle to the stop surface (25) for the open position of the contact lever (2) . 3. Kontaktanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Anschlagfläche (25) für die geöffnete Stellung des Kontakthebels (2) und die pfannen­artige Vertiefung (13) durch eine stetige Übergangsfläche (27) verbunden sind.3. Contact arrangement according to claim 1, characterized in that the stop surface (25) for the open position of the contact lever (2) and the pan-like recess (13) are connected by a continuous transition surface (27). 4. Kontaktanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Kontakthebelträger (2) nahe der pfannenartigen Vertiefung (13) an seiner den Anschlag­flächen (24, 25) abgewandten Seite zum Durchtritt eines mit dem Kontakthebel (2) verbundenen Strombandes (11) eine Öffnung (31) besitzt.4. Contact arrangement according to claim 1, characterized in that the contact lever carrier (2) near the pan-like recess (13) on its side facing away from the stop surfaces (24, 25) for the passage of a current strip (11) connected to the contact lever (2) has an opening (31) has.
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
DE19873732468 DE3732468A1 (en) 1987-09-23 1987-09-23 CONTACT ARRANGEMENT OF A LOW VOLTAGE CIRCUIT BREAKER WITH ELECTRODYNAMIC OPENING
DE3732468 1987-09-23

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

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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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EP (1) EP0309382B1 (en)
DE (2) DE3732468A1 (en)

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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
DE10137506C1 (en) * 2001-07-26 2002-08-08 Siemens Ag Switch contact arrangement for an electrical switch
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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US4635011A (en) * 1985-05-01 1987-01-06 Westinghouse Electric Corp. Circuit breaker with arm latch for high interrupting capacity
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FR2553930A1 (en) * 1983-10-21 1985-04-26 Merlin Gerin Reversible mechanism for controlling a multipole limiter circuit breaker
US4635011A (en) * 1985-05-01 1987-01-06 Westinghouse Electric Corp. Circuit breaker with arm latch for high interrupting capacity
EP0209058A2 (en) * 1985-07-18 1987-01-21 Westinghouse Electric Corporation Molded case circuit breaker with a movable electrical contact positioned by a camming spring loaded clip

Also Published As

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US4845459A (en) 1989-07-04
EP0309382B1 (en) 1993-07-14
DE3882318D1 (en) 1993-08-19
DE3732468A1 (en) 1989-04-06

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