EP0266762B1 - Current limiting electric switching device - Google Patents

Current limiting electric switching device Download PDF

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Publication number
EP0266762B1
EP0266762B1 EP87116282A EP87116282A EP0266762B1 EP 0266762 B1 EP0266762 B1 EP 0266762B1 EP 87116282 A EP87116282 A EP 87116282A EP 87116282 A EP87116282 A EP 87116282A EP 0266762 B1 EP0266762 B1 EP 0266762B1
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EP
European Patent Office
Prior art keywords
contact arm
contact
locking
fulcrum
switch
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
EP87116282A
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German (de)
French (fr)
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EP0266762A2 (en
EP0266762A3 (en
Inventor
Hermann Dr. Hochhaus
Helmut Dipl.-Ing. Drewes
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication date
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Priority to AT87116282T priority Critical patent/ATE84914T1/en
Publication of EP0266762A2 publication Critical patent/EP0266762A2/en
Publication of EP0266762A3 publication Critical patent/EP0266762A3/en
Application granted granted Critical
Publication of EP0266762B1 publication Critical patent/EP0266762B1/en
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Classifications

    • 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
    • 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

Definitions

  • the invention relates to an electrical switching device according to the preamble of claim 1.
  • the shortest possible switch-off delay times (e.g. 2 ms or less) are required. These times cannot be achieved with the usual lock constructions (on / off mechanism, quick release device by means of a magnetic release) due to the masses to be accelerated and the lever paths to be traveled.
  • the short-circuit current itself must therefore contribute to the accelerated opening of the switching elements (dynamic opening).
  • the electrodynamic effect on the contact arms is generally relatively small in the nominal current and overload range, but in the event of a short circuit, usable forces result from the quadratic current dependence. Currents are problematic, the amplitude of which causes lifting and a slight opening of the contact pieces, but is too small for further acceleration of the contact arm masses are. This can lead to the contacts being closed again or to undesired bouncing processes.
  • a construction is known from DE-A-1463 320, in which a releasable toothed rack coupling is present between the movable contact piece of the contact system and a rotary or swiveling lever causing the release of a switching lock, which frictional connection between the movable contact piece and then produces the rotary or pivoting lever when the movable contact piece strives to perform a closing movement opposite to the opening movement during the opening process, e.g. B. when rebounding from a stop or with an imperfect opening.
  • the object of the invention is to improve a switching device of the type mentioned above in such a way that after an electrodynamic opening of the contact system with simple means an operationally reliable locking of the movable switching contact arm is ensured in any position-dependent positions, which can be released again.
  • the additional switching function can be integrated with relatively few construction parts, and the arc extinguishing is improved with increased security for the switching system and the subordinate and elements to be protected.
  • the lock release mechanism can be made simpler, since its mechanical delay time is no longer critical for the switch-off behavior.
  • a minimum contact distance can be set, at which earliest it is kept open after dynamic lifting.
  • skilful shaping of the locking lugs a progressive inhibition can be achieved on the opening switch contact arm, which prevents strong opening and / or bouncing back at very high currents.
  • the switch is in the switch position "on".
  • the contact piece 1 on the movable contact arm 2 lies on the fixed contact piece 3, which is arranged on a loop-shaped power supply 4.
  • the key switch 5 is in the locked position.
  • a certain contact force is predetermined by the lever mechanism and a spring 6.
  • a toothing 7 is attached, which interacts with a spring 8 arranged in the housing bottom.
  • the lower knee joint lever 9 of the switching lock 5 and the switching shaft 10 are articulated on the contact arm 2 via a lever 11 by means of a bolt 12.
  • the movable contact arm 2 is repelled against the force of the spring 6 by the forces which arise from the loop-shaped design of the power supply and rotates about an axis A (bolt 12) on a circular path a (FIG. 1b switch dynamically opened ). If the repulsive force overall is so strong that the spring 8 engages at least in the first toothing 7, it is no longer possible to close or rebound the contacts. The arc between the contact pieces must commute as quickly as possible from these on tracks or directly into an extinguishing system.
  • the now unlocked switching lock 5 acts a short time later on the contact arm 2 and lifts it in another way b around the pivot point B, the latching being released. The arm is guided on path b to the end position (Fig. 1c switch open).
  • a stepless inhibition is achieved in that the contact arm 2, instead of a toothing as in the example according to FIG. 1, has a part 13 rounded off with a radius r, which cooperates with a spring-loaded friction roller 14, 15 in the housing base.
  • the contact arm 2 can be moved along the roller 15.
  • the roller 15 wedges in the opposite direction (closing of the contacts) the contact arm 2 with the housing bottom.
  • the escapement is released again when the mechanical switching lock 5 lifts the contact arm 2 from path a with the pivot point A to path b with the pivot point B in the direction of the switch-off position
  • FIG. 2c. 2b shows the dynamic open position in which the contact arm 2 is prevented from returning by the friction roller 15.
  • the variant according to FIG. 3 differs from the embodiment according to FIG. 1 in principle in that the cams 17 for latching or latching are part of a housing or bulkhead wall 18 or can be inserted into this as a special component.
  • the counterpart for the cams 17 can be a bolt 19 in the contact arm 2.
  • FIG. 4 Another solution to the problem is shown in FIG. 4. Thereafter, cams 21 are mounted in opposite housing walls 20. A limitation to certain radii is not necessary.
  • the locking takes place by means of an elastic cam 22 on the movable contact arm 2.
  • the force in the opening direction causes the cams to "ratchet” until the contact arm 2 stops.
  • the movement of the arm back or even in the fully open position of the switching device requires at least one force F to overcome it another cam.
  • This force must be applied from the unlocked switch lock to the opening, or from the mechanical or electrical actuation unit (spring-loaded mechanism, coil, armature, motor drive, manual control device).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Fuses (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

In current-limiting low-voltage circuit breakers, the contact arm is prevented from bouncing back after completion of electrodynamic opening by a catch in the partially open position. The catch, in any position depending on the opening forces, is produced by slots, teeth or inclined surfaces fitted to the moving contact arm which interact with a correspondingly designed mating piece fitted rigidly the housing or by depressions or bulges provided in the housing or switch wall which interact with a mating piece in the switching contact arm. The catch is released by the unlocked bolt and the associated movement of the contact arm about a different point of rotation, or by an applied force which is greater than the retaining force. <IMAGE>

Description

Die Erfindung betrifft ein elektrisches Schaltgerät gemäß Oberbegriff des Anspruchs 1.The invention relates to an electrical switching device according to the preamble of claim 1.

In Schaltgeräten mit strombegrenzender Charakteristik werden möglichst kurze Ausschaltverzugszeiten (z. B. 2 ms oder weniger) gefordert. Diese Zeiten können mit den üblichen Schloßkonstruktionen (Ein-/Ausschaltmechanismus, Schnellauslösevorrichtung mittels magnetischem Auslöser) aufgrund der zu beschleunigenden Massen und der zu durchfahrenden Hebelwege nicht erreicht werden.In switching devices with a current-limiting characteristic, the shortest possible switch-off delay times (e.g. 2 ms or less) are required. These times cannot be achieved with the usual lock constructions (on / off mechanism, quick release device by means of a magnetic release) due to the masses to be accelerated and the lever paths to be traveled.

Der Kurzschlußstrom selbst muß deshalb zur beschleunigten Öffnung der Schaltglieder beitragen (dynamische Öffnung). Die elektrodynamische Wirkung auf die Kontaktarme ist im allgemeinen in Nennstrom- und Überlastbereich relativ klein, im Kurzschlußfall ergeben sich aber durch die quadratische Stromabhängigkeit nutzbare Kräfte. Problematisch sind Ströme, deren Amplitude zwar ein Abheben und eine geringe Öffnung der Kontaktstücke bewirken, aber für eine weitere Beschleunigung der Kontaktarmmassen zu klein sind. Hier kann es zum erneuten Schließen der Kontakte bzw. zu unerwünschten Prellvorgängen kommen. Um dieses zu verhindern, ist aus der DE-A-1463 320 eine Konstruktion bekannt, bei der zwischen dem beweglichen Kontaktstück des Kontaktsystems und einem die Entklinkung eines Schaltschlosses bewirkenden Dreh- oder Schwenkhebel eine lösbare Zahnstangenkupplung vorhanden ist, die einen Kraftschluß zwischen dem beweglichen Kontaktstück und dem Dreh- oder Schwenkhebel dann herstellt, wenn das bewegliche Kontaktstück bestrebt ist, beim Öffnungsvorgang entgegengesetzt zur Öffnungsbewegung eine Schließbewegung auszuführen, z. B. beim Rückprellen von einem Anschlag oder bei nur unvollkommener Öffnung.The short-circuit current itself must therefore contribute to the accelerated opening of the switching elements (dynamic opening). The electrodynamic effect on the contact arms is generally relatively small in the nominal current and overload range, but in the event of a short circuit, usable forces result from the quadratic current dependence. Currents are problematic, the amplitude of which causes lifting and a slight opening of the contact pieces, but is too small for further acceleration of the contact arm masses are. This can lead to the contacts being closed again or to undesired bouncing processes. To prevent this, a construction is known from DE-A-1463 320, in which a releasable toothed rack coupling is present between the movable contact piece of the contact system and a rotary or swiveling lever causing the release of a switching lock, which frictional connection between the movable contact piece and then produces the rotary or pivoting lever when the movable contact piece strives to perform a closing movement opposite to the opening movement during the opening process, e.g. B. when rebounding from a stop or with an imperfect opening.

Aus US-A-4 409 573 und GB-A-1 052 519 sind auch elektrische Schaltgeräte mit mindestens einem beweglichen Kontaktarm bekannt, wobei der Kontaktarm aber nur in einer bestimmten Stellung verriegelbar ist. Bei dieser Vorrichtungen ist ein Verriegeln des Schaltkontaktarmes in beliebigen, von den Öffnungskräften abhängigen Positionen nicht möglich.From US-A-4 409 573 and GB-A-1 052 519 electrical switching devices with at least one movable contact arm are also known, but the contact arm can only be locked in a certain position. With these devices, it is not possible to lock the switch contact arm in any position dependent on the opening forces.

Aufgabe der Erfindung ist es, ein Schaltgerät der vorangehend erwähnten Art derart zu verbessern, daß nach einer elektrodynamischen Öffnung des Kontaktsystems mit einfachen Mitteln eine betriebssichere Arretierung des beweglichen Schaltkontaktarmes in beliebigen, von den Öffnungskräften abhängigen Positionen gewährleistet wird, die wieder lösbar ist.The object of the invention is to improve a switching device of the type mentioned above in such a way that after an electrodynamic opening of the contact system with simple means an operationally reliable locking of the movable switching contact arm is ensured in any position-dependent positions, which can be released again.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1-4 und des Anspruchs 7 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claims 1-4 and claim 7.

Die besonderen Vorteile der Erfindung sind darin zu sehen, daß mit relativ wenigen Konstruktionsteilen die zusätzliche Schaltfunktion integriert werden kann, und die Lichtbogenlöschung bei erhöhter Sicherheit für das Schaltsystem und die nachgeordneten und zu schützenden Elemente verbessert wird. Der Schloßauslösemechanismus kann einfacher gestaltet werden, da dessen mechanische Verzugszeit nicht mehr kritisch für das Ausschaltverhalten ist. Je nach Schaltgerätetyp und Stromstärke kann ein Mindestkontaktabstand eingestellt werden, bei dem es frühestens zur Offenhaltung nach dem dynamischen Abheben kommt. Durch geschickte Formgebung der Rastnasen kann auf den aufschlagenden Schaltkontaktarm eine progressive Hemmung erwirkt werden, die ein starkes Aufschlagen und/oder Zurückprellen bei sehr hohen Strömen verhindert.The particular advantages of the invention can be seen in the fact that the additional switching function can be integrated with relatively few construction parts, and the arc extinguishing is improved with increased security for the switching system and the subordinate and elements to be protected. The lock release mechanism can be made simpler, since its mechanical delay time is no longer critical for the switch-off behavior. Depending on the switchgear type and current strength, a minimum contact distance can be set, at which earliest it is kept open after dynamic lifting. By skilful shaping of the locking lugs, a progressive inhibition can be achieved on the opening switch contact arm, which prevents strong opening and / or bouncing back at very high currents.

In der Zeichnung sind Ausführungsbeispiele nach der Erfindung dargestellt. Es zeigen

Fig. 1
eine Kontakteinrichtung in drei Schaltstellungen mit einer Verzahnung am beweglichen Kontaktarm und einer Feder im Gehäuseboden,
Fig. 2
die Kontakteinrichtung mit einer Auflauffläche am Kontaktarm und einer Reibrolle am Gehäuseboden, ebenfalls in drei Schaltstellungen,
Fig. 3
eine Verzahnung in einer Gehäusewand, die mit einem Bolzen im Kontaktarm zusammenwirkt und
Fig. 4
eine Variante mit Nocken in gegenüberliegenden Gehäusewandungen, die mit einem Nocken am Kontaktarm zusammenwirken.
Exemplary embodiments according to the invention are shown in the drawing. Show it
Fig. 1
a contact device in three switching positions with teeth on the movable contact arm and a spring in the housing base,
Fig. 2
the contact device with a contact surface on the contact arm and a friction roller on the housing base, also in three switch positions,
Fig. 3
a toothing in a housing wall, which interacts with a bolt in the contact arm and
Fig. 4
a variant with cams in opposite housing walls, which interact with a cam on the contact arm.

Gemäß Fig. 1a befindet sich der Schalter in der Schaltstellung "Ein". Das Kontaktstück 1 am beweglichen Kontaktarm 2 liegt auf dem festen Kontaktstück 3, das auf einer schleifenförmigen Stromzuführung 4 angeordnet ist. Das Schaltschloß 5 ist in verriegelter Stellung. Durch die Hebelmechanik und eine Feder 6 ist eine bestimmte Kontaktkraft vorgegeben. An einem Teil des Kontaktarmes 2 ist eine Verzahnung 7 angebracht, die mit einer im Gehäuseboden angeordneten Feder 8 zusammenwirkt. Am Kontaktarm 2 sind der untere Kniegelenkhebel 9 des Schaltschlosses 5 und die Schaltwelle 10 über einem Hebel 11 mittels eines Bolzens 12 angelenkt. Bei einem hohen Kurzschlußstrom wird der bewegliche Kontaktarm 2 entgegen der Kraft der Feder 6 durch die Kräfte, die durch die schleifenförmige Gestaltung der Stromzuführung entstehen, abgestoßen und dreht um eine Achse A (Bolzen 12) auf einer Kreisbahn a (Fig. 1b Schalter dynamisch geöffnet). Ist die Abstoßungskraft insgesamt so stark, daß die Feder 8 zumindest in die erste Verzahnung 7 einrastet, ist ein erneutes Schließen bzw. Zurückprallen der Kontakte nicht mehr möglich. Der Lichtbogen zwischen den Kontaktstücken muß schnellstens von diesen auf Laufschienen oder direkt in ein Löschsystem kommutieren. Das inzwischen entriegelte Schaltschloß 5 wirkt kurze Zeit später auf den Kontaktarm 2 und hebt diesen auf einen anderen Weg b um den Drehpunkt B, wobei die Verrastung aufgehoben wird. Der Arm wird auf dem weg b bis zur Endposition geführt (Fig. 1c Schalter offen).1a, the switch is in the switch position "on". The contact piece 1 on the movable contact arm 2 lies on the fixed contact piece 3, which is arranged on a loop-shaped power supply 4. The key switch 5 is in the locked position. A certain contact force is predetermined by the lever mechanism and a spring 6. On a part of the contact arm 2, a toothing 7 is attached, which interacts with a spring 8 arranged in the housing bottom. The lower knee joint lever 9 of the switching lock 5 and the switching shaft 10 are articulated on the contact arm 2 via a lever 11 by means of a bolt 12. At a high short-circuit current, the movable contact arm 2 is repelled against the force of the spring 6 by the forces which arise from the loop-shaped design of the power supply and rotates about an axis A (bolt 12) on a circular path a (FIG. 1b switch dynamically opened ). If the repulsive force overall is so strong that the spring 8 engages at least in the first toothing 7, it is no longer possible to close or rebound the contacts. The arc between the contact pieces must commute as quickly as possible from these on tracks or directly into an extinguishing system. The now unlocked switching lock 5 acts a short time later on the contact arm 2 and lifts it in another way b around the pivot point B, the latching being released. The arm is guided on path b to the end position (Fig. 1c switch open).

In der Ausführungsform nach Fig. 2 wird eine stufenlose Hemmung dadurch erreicht, daß der Kontaktarm 2 statt einer Verzahnung wie im Beispiel nach Fig. 1 einen mit einem Radius r abgerundeten Teil 13 aufweist, der mit einer federbelasteten Reibrolle 14, 15 im Gehäuseboden zusammenwirkt. In Richtung des Pfeiles 16 kann der Kontaktarm 2 entlang der Rolle 15 bewegt werden. In der Gegenrichtung (Schließen der Kontakte) verkeilt die Rolle 15 den Kontaktarm 2 mit dem Gehäuseboden. Die Hemmung wird wieder aufgehoben, wenn das mechanische Schaltschloß 5 den Kontaktarm 2 vom Weg a mit dem Drehpunkt A auf den Weg b mit dem Drehpunkt B hebt in Richtung Ausschaltestellung Fig. 2c bewegt. Die Fig. 2b zeigt die dynamische Offenstellung, in der der Kontaktarm 2 durch die Reibrolle 15 am Rücklauf gehindert wird.In the embodiment according to FIG. 2, a stepless inhibition is achieved in that the contact arm 2, instead of a toothing as in the example according to FIG. 1, has a part 13 rounded off with a radius r, which cooperates with a spring-loaded friction roller 14, 15 in the housing base. In the direction of arrow 16, the contact arm 2 can be moved along the roller 15. The roller 15 wedges in the opposite direction (closing of the contacts) the contact arm 2 with the housing bottom. The escapement is released again when the mechanical switching lock 5 lifts the contact arm 2 from path a with the pivot point A to path b with the pivot point B in the direction of the switch-off position FIG. 2c. 2b shows the dynamic open position in which the contact arm 2 is prevented from returning by the friction roller 15.

Die Variante nach Fig. 3 unterscheidet sich von der Ausführungsform nach Fig. 1 prinzipiell dadurch, daß die Nocken 17 zur Verklinkung bzw. Verrastung Teil einer Gehäuse- oder Schottwand 18 sind oder als besonderes Bauteil in diese eingefügt werden können. Das Gegenstück für die Nocken 17 kann ein Bolzen 19 im Kontaktarm 2 sein. Bei einer dynamischen Öffnung der Kontaktstücke wird der Kontaktarm 2 um die Achse A auf einer Kreisbahn a bewegt und in einer durch die elektrodynamischen Kräfte und die Kraft der Feder 6 bestimmten Stellung verrastet. Die Nockenreihe 17 ist so gestaltet, daß sie in ihrem Radius der Kreisbahn a entspricht. Die Verrastung wird wieder durch die nachfolgende Drehung der Schaltwelle 10 (Achse B mit der Kreisbahn b) aufgehoben.The variant according to FIG. 3 differs from the embodiment according to FIG. 1 in principle in that the cams 17 for latching or latching are part of a housing or bulkhead wall 18 or can be inserted into this as a special component. The counterpart for the cams 17 can be a bolt 19 in the contact arm 2. When the contact pieces are opened dynamically, the contact arm 2 is moved about the axis A on a circular path a and locked in a position determined by the electrodynamic forces and the force of the spring 6. The cam row 17 is designed so that its radius corresponds to the circular path a. The locking is released again by the subsequent rotation of the control shaft 10 (axis B with the circular path b).

Eine andere Lösung des Problems ist in Fig. 4 dargestellt. Danach sind Nocken 21 in gegenüberliegenden Gehäusewandungen 20 angebracht. Eine Beschränkung auf bestimmte Radien ist nicht erforderlich. Die Verrastung geschieht durch einen elastischen Nocken 22 am beweglichen Kontaktarm 2. Die Kraft in Öffnungsrichtung bewirkt ein "Überratschen" der Nocken bis zum Stillstand des Kontaktarmes 2. Die Bewegung des Armes zurück oder auch in volle Offenstellung des Schaltgerätes erfordert mindestens eine Kraft F zur Überwindung weiterer Nocken. Diese Kraft muß vom entriegelten Schaltschloß zur Öffnung, bzw. von der mechanischen oder elektrischen Betätigungseinheit (Federspeicher, Spule, Anker, motorischer Antrieb, manuelle Bedienungseinrichtung) aufgebracht werden.Another solution to the problem is shown in FIG. 4. Thereafter, cams 21 are mounted in opposite housing walls 20. A limitation to certain radii is not necessary. The locking takes place by means of an elastic cam 22 on the movable contact arm 2. The force in the opening direction causes the cams to "ratchet" until the contact arm 2 stops. The movement of the arm back or even in the fully open position of the switching device requires at least one force F to overcome it another cam. This force must be applied from the unlocked switch lock to the opening, or from the mechanical or electrical actuation unit (spring-loaded mechanism, coil, armature, motor drive, manual control device).

Claims (8)

  1. Electric switching apparatus with two contact studs (1, 3) of respective pole paths, of which at least one is mounted on a movable switch contact arm (2), which is mounted in a fulcrum (A) on a pivot member fixedly connected with the switch shaft (10) and in the short circuit case, before response of the trip device, opens the contact by a pivot movement about this fulcrum (A), on which contact in that case locking elements act which prevent a rebounding and arrest the contact arm (2) in a desired position dependent on the opening force, and wherein the locking is lifted on opening of the switch lock by way of rotation of the switch shaft (10) in that the pivot member acts by an entrainer on the contact arm, characterised thereby that the contact arm (2) has a locking profile (7, 13) which is formed at its rotatably mounted end and which, on rebounding of the contact arm (2) about its fulcrum (A), co-operates with a resilient blocking element (8, 15) mounted at a stationary location in the switching apparatus, and that on closing of the contact arm (2) about the fulcrum (B) of the switch shaft the profile (7, 13) and the blocking element (8, 15) are out of engagement.
  2. Switching apparatus according to claim 1, characterised thereby that the locking profile is constructed as a toothing (7) and the blocking element as a detent spring (8) fastened to the housing base.
  3. Switching apparatus according to claim 1, characterised thereby that the locking profile is constructed as a lifting cam (13) and the blocking element as a resilient friction roller (15), which is fastened to the housing base and which on rebounding of the contact arm is clamped by a compression spring (14) between lifting cam (13) and housing base.
  4. Electric switching apparatus with two contact studs (1, 3) of respective pole paths, of which at least one is mounted on a movable switch contact arm (2), which is mounted in a fulcrum (A) on a pivot member fixedly connected with the switch shaft (10) and in the short circuit case, before response of the trip device, opens the contact by a pivot movement about this fulcrum (A) on which contact in that case locking elements act which prevent a rebounding and arrest the contact arm (2) in a desired position dependent on the opening force, and wherein the locking is lifted on opening of the switch lock by way of rotation of the switch shaft (10) in that the pivot member acts by an entrainer on the contact arm, characterised thereby that a locking profile (17) is arranged at a stationary location in the switch housing and, on rebounding of the contact arm (2) about its fulcrum (A), co-operates with a resilient blocking element (19) which is fastened to the rotatably mounted end of the contact arm (2), and that on closing of the contact arm (2) about the fulcrum (B) of the switch shaft the profile (17) and the blocking element (19) are out of engagement.
  5. Switching apparatus according to claim 4, characterised thereby that the locking profile (17) is constructed as a curved sawtooth toothing, which corresponds in its curvature to an arc (9) about the fulcrum (A) of the contact arm, and that the blocking element (19) is constructed as a pin.
  6. Switching apparatus according to claim 4 or 5, characterised thereby that the locking profile (17) is constructed at a separate component (18) intended for insertion into the housing wall or compartment wall.
  7. Electric switching apparatus with two contact studs (1, 3) of respective pole paths, of which at least one is mounted on a movable switch contact arm (2), which is mounted in a fulcrum (A) on a pivot member fixedly connected with the switch shaft (10) and in the short circuit case, before response of the trip device, opens the contact by a pivot movement about this fulcrum (A) on which contact in that case locking elements act which prevent a rebounding and arrest the contact arm (2) in a desired position dependent on the opening force, and wherein the locking is lifted on opening of the switch lock by way of rotation of the switch shaft (10) in that the pivot member acts by an entrainer on the contact arm, characterised thereby that the pivot member (11) of the switch shaft (10) has a cam profile (22), which on rebounding of the contact arm (2) co-operates with a roller (20), which is slidingly guided in an elongate hole (21) of the contact arm (2) and is drawn into the cam profile (22) by a tension spring (6), that on an opening rotation of the switch shaft (10) the contact arm (2) locked in the cam profile (22) is guided towards an abutment (23) arranged at a stationary location in the switching apparatus, and that on further rotation of the switch shaft (10) the locking is lifted, in that the roller (20) slides back on the cam profile (22) into its start position.
  8. Switching apparatus according to one of claims 1 to 7, characterised thereby that the cam profile or locking profile (7, 13, 17, 22) is so constructed that the locking is introduced only after exceeding of a minimum contact gap.
EP87116282A 1986-11-06 1987-11-05 Current limiting electric switching device Expired - Lifetime EP0266762B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116282T ATE84914T1 (en) 1986-11-06 1987-11-05 CURRENT-LIMITING ELECTRICAL SWITCHING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863637913 DE3637913A1 (en) 1986-11-06 1986-11-06 CURRENT ELECTRICAL SWITCHGEAR
DE3637913 1986-11-06

Publications (3)

Publication Number Publication Date
EP0266762A2 EP0266762A2 (en) 1988-05-11
EP0266762A3 EP0266762A3 (en) 1989-02-22
EP0266762B1 true EP0266762B1 (en) 1993-01-20

Family

ID=6313357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116282A Expired - Lifetime EP0266762B1 (en) 1986-11-06 1987-11-05 Current limiting electric switching device

Country Status (3)

Country Link
EP (1) EP0266762B1 (en)
AT (1) ATE84914T1 (en)
DE (2) DE3637913A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5793270A (en) * 1996-09-03 1998-08-11 Eaton Corporation Circuit breaker with latch preventing rebound of blow open contact arm
DE102005046640B4 (en) * 2005-09-29 2007-10-18 Abb Patent Gmbh Electrical installation device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1986601U (en) * 1963-04-11 1968-06-06 Licentia Gmbh SELF SWITCH.
GB1052519A (en) * 1963-04-11 1900-01-01
DE1463320A1 (en) * 1963-06-28 1969-03-27 Licentia Gmbh Auto switch
US4409573A (en) * 1981-04-23 1983-10-11 Siemens-Allis, Inc. Electromagnetically actuated anti-rebound latch
US4528531A (en) * 1983-12-19 1985-07-09 Westinghouse Electric Corp. Molded case circuit breaker with improved operating mechanism
US4594567A (en) * 1984-09-28 1986-06-10 Siemens-Allis, Inc. Circuit breaker contact arm assembly having a magnetic carrier
US4608545A (en) * 1985-09-24 1986-08-26 Siemens-Allis, Inc. Movable contact arm assembly for a current limiting circuit breaker

Also Published As

Publication number Publication date
DE3637913C2 (en) 1989-10-19
EP0266762A2 (en) 1988-05-11
ATE84914T1 (en) 1993-02-15
DE3637913A1 (en) 1988-05-19
DE3783719D1 (en) 1993-03-04
EP0266762A3 (en) 1989-02-22

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