EP0255483B1 - Switching mechanism of a protective switch - Google Patents

Switching mechanism of a protective switch Download PDF

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Publication number
EP0255483B1
EP0255483B1 EP19870810418 EP87810418A EP0255483B1 EP 0255483 B1 EP0255483 B1 EP 0255483B1 EP 19870810418 EP19870810418 EP 19870810418 EP 87810418 A EP87810418 A EP 87810418A EP 0255483 B1 EP0255483 B1 EP 0255483B1
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EP
European Patent Office
Prior art keywords
switching mechanism
contact part
movable contact
lever
release lever
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
EP19870810418
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German (de)
French (fr)
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EP0255483A2 (en
EP0255483A3 (en
Inventor
Arthur Rusch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber AG
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Weber AG
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Publication date
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Publication of EP0255483A2 publication Critical patent/EP0255483A2/en
Publication of EP0255483A3 publication Critical patent/EP0255483A3/en
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Publication of EP0255483B1 publication Critical patent/EP0255483B1/en
Anticipated expiration legal-status Critical
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/52Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • the invention relates to a switching mechanism of a circuit breaker according to the preamble of claim 1.
  • Such a switching mechanism is e.g. known from DE-A-3516217.
  • a circuit breaker is described there (FIG. 1), with a pair of separable contacts 16, 18, at least one of which is movable.
  • the actuating mechanism 34 consists of a locking element 44 and an articulated lever mechanism 58.
  • the locking element 44 is rotatably mounted on the movable contact arm 36.
  • the articulated lever mechanism 58 is connected at one end to an actuating part 32, and at its other end is directly engageable with the movable contact arm 36 and with the locking element 44.
  • the movable contact arm 36 has a locking surface 72, and the locking element 44 has a locking end 82 which, together with the locking surface 72, removably catches the other end of the articulated lever mechanism 58.
  • a stop surface 75 is formed on the movable contact arm 36, which prevents movement of the other end 68 of the articulated lever mechanism 58 beyond a point at which the articulated lever mechanism 58 is partially folded over when the contacts 16, 18 are welded together.
  • the switching mechanism described above has the major disadvantage that the locking surface 72 is designed such that the resulting force of the articulated lever mechanism 58 on the movable contact arm 36 is greatest when the contacts 16 and 18 are just touching when switched on. The distance between the piston 30 of the electromagnetic switching device 26 and the movable contact arm 36 is then the smallest. If the circuit breaker is switched on while there is a short circuit on the subsequent electrical lines, a greater force is required to trigger the switch. There is therefore a risk that the switch will not trip. To prevent this, the trigger force should be small with a small trigger stroke and larger with a larger trigger stroke. The trigger stroke is to be understood as the distance between the piston 30 and the locking element 44.
  • the object of the invention is now, in a switching mechanism of the aforementioned type, to improve the interaction of the toggle lever and release lever in such a way that the circuit breaker is triggered with less force when switched on during a short circuit than with a short circuit in the switched on state.
  • This object is achieved in a switching mechanism of the above type by the features of patent claim 1.
  • the invention is based on the knowledge that only an exact coordination of the forces acting on the switching mechanism ensures an optimal function of the circuit breaker under all conditions.
  • the stroke of the impact anchor - i.e. the total kinetic energy released by the impact anchor can therefore be significantly lower than with conventional circuit breakers.
  • An additional advantage of the invention is the automatic construction of the switching mechanism.
  • the individual parts of the switching mechanism are manufactured in such a way that the circuit breaker can be manufactured in assemblies by production machines. For example, no additional guidance for the toggle lever is required in the switch housing, since it is constantly surrounded by the movable contact part.
  • the guide bracket and the guide in the bottom part of the housing ensure that the switching mechanism does not tilt even during assembly.
  • a part of a circuit breaker is shown, in which the contact parts just touch.
  • the switching mechanism 1 is housed in a housing 2.
  • the contact device of the circuit breaker consists of a movable contact part 3 and a fixed contact part 4.
  • the movable contact part 3 is pressed away from the fixed contact part 4 by a contact spring 5.
  • the contact spring 5 is a leg spring with two longer ends. One end lies directly on the narrow side of the housing 2, and the other end is guided into a hole which is located on the top of the movable contact part 3.
  • An actuator 6 - here a rocker arm - is brought into the switched-off state by a helical return spring 7.
  • the actuator 6 is connected to the movable contact part 3 via a toggle lever 8.
  • the toggle lever 8 is a U-shaped bracket, which can be designed as a variant of an almost closed rectangle, and which is guided through a slot 9 in the upper part of the movable contact part 3.
  • a release lever 10 is rotatably connected to the movable contact part 3.
  • a compression spring 11 is provided between the lower end of the release lever 10 and the movable contact part 3.
  • the trigger lever 10 is branched at the top, the right end being provided with a nose which normally holds the knee lever 8 trapped in the slot 9 at the top.
  • Approximately identical holes are located in the middle of the movable contact part 3 and the trigger lever 10.
  • One leg of a U-shaped guide bracket 12 forms the axis of rotation and is inserted through the holes.
  • the other leg is from a guide 13 is enclosed in the bottom part of the housing 2 (cf. also FIG. 1a).
  • a strand 16 connects the movable contact part 3 to the thermal release 15.
  • a stop 17 in the housing at the level of the upper end of the movable contact part 3 limits the opening of the contact.
  • Fig. 1a is a cross section of the circuit breaker along the line A-A in Fig. 1.
  • the same reference numerals have been used for the same elements.
  • the movable contact part 3 consists of two parallel parts which are connected to one another on the rear side.
  • the release lever 10 is arranged in between.
  • FIGS. 2 and 3 The same circuit breaker is shown in FIGS. 2 and 3, in the switched-on and in the switched-off state.
  • Fig. 3 the arrangement of the actuating member 6 and the toggle lever 8 is indicated by a dashed line when released. This is the case when the actuator 6 is blocked in the switched-on state and a short circuit or overcurrent occurs.
  • the kinetic energy of the impact anchor 14, which is dependent on the release stroke B, is low when the force to be overcome is small, and greater when this force is greater. This means that the circuit breaker switches off just as well when switched on during a short circuit as when a short circuit is switched on.
  • the above construction of the individual parts of the switching mechanism 1 is particularly advantageous for automatic production of the circuit breaker. Since in particular - apart from the guide 13 - no further guides are necessary in the housing, the movable contact part 3, the release lever 10, the compression spring 11, the guide bracket 12, the toggle lever 8 and the actuating member 6 can be assembled as the first assembly in production. The switching mechanism 1 constructed in this way can then be pushed into the housing 2 relatively easily. The remaining manipulations can be carried out with the housing open without any aids, since the guide bracket 12 prevents the switching mechanism 1 from being tilted by the contact spring 5.

Description

Die Erfindung betrifft einen Schaltmechanismus eines Schutzschalters nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a switching mechanism of a circuit breaker according to the preamble of claim 1.

Ein solcher Schaltmechanismus ist z.B. bekannt aus DE-A-3516217. Dort ist ein Schaltungsunterbrecher beschrieben (Fig. 1), mit einem Paar von trennbaren Kontakten 16, 18 von denen mindestens einer beweglich ist. Der Betätigungsmechanismus 34 besteht aus einem Verriegelungselement 44 und einem Gelenkhebelmechanismus 58. Das Verriegelungselement 44 ist drehbar am beweglichen Kontaktarm 36 montiert. Der Gelenkhebelmechanismus 58 ist an seinem einen Ende mit einem Betätigungsteil 32 verbunden, und ist an seinem anderen Ende direkt mit dem beweglichen Kontaktarm 36 und mit dem Verriegelungselement 44 in Eingriff bringbar. Der bewegliche Kontaktarm 36 hat eine Verriegelungsfläche 72, und das Verriegelungselement 44 hat ein Verriegelungsende 82, das zusammen mit der Verriegelungsfläche 72 das andere Ende des Gelenkhebelmechanismus 58 lösbar einfängt. Am beweglichen Kontaktarm 36 ist eine Anschlagfläche 75 ausgebildet, die eine Bewegung des anderen Endes 68 des Gelenkhebelmechanismus 58 über einen Punkt hinaus verhindert, bei dem der Gelenkhebelmechanismus 58 teilweise umgeklappt ist, wenn die Kontakte 16, 18 miteinander verschweisst sind.Such a switching mechanism is e.g. known from DE-A-3516217. A circuit breaker is described there (FIG. 1), with a pair of separable contacts 16, 18, at least one of which is movable. The actuating mechanism 34 consists of a locking element 44 and an articulated lever mechanism 58. The locking element 44 is rotatably mounted on the movable contact arm 36. The articulated lever mechanism 58 is connected at one end to an actuating part 32, and at its other end is directly engageable with the movable contact arm 36 and with the locking element 44. The movable contact arm 36 has a locking surface 72, and the locking element 44 has a locking end 82 which, together with the locking surface 72, removably catches the other end of the articulated lever mechanism 58. A stop surface 75 is formed on the movable contact arm 36, which prevents movement of the other end 68 of the articulated lever mechanism 58 beyond a point at which the articulated lever mechanism 58 is partially folded over when the contacts 16, 18 are welded together.

Der oben beschriebene Schaltmechanismus hat den grossen Nachteil, dass die Verriegelungsfläche 72 derart ausgebildet ist, dass die resultierende Kraft des Gelenkhebelmechanismus 58 auf den beweglichen Kontaktarm 36 am grössten ist, wenn die Kontakte 16 und 18 sich beim Einschalten gerade berühren. Der Abstand zwischen dem Kolben 30 der elektromagnetischen Schalteinrichtung 26 und dem beweglichen Kontaktarm 36 ist just dann am geringsten. Wird der Schutzschalter eingeschaltet, währenddessen ein Kurzschluss auf den nachfolgenden elektrischen Leitungen besteht, so wird eine grössere Kraft benötigt um den Schalter auszulösen. Es besteht deshalb die Gefahr, dass der Schalter nicht auslöst. Um dies zu verhindern, soll die Auslösekraft klein sein bei einem geringen Auslösehub und grösser bei einem grösseren Auslösehub. Unter Auslösehub ist der Abstand zwischen dem Kolben 30 und dem Verriegelungselement 44 zu verstehen.The switching mechanism described above has the major disadvantage that the locking surface 72 is designed such that the resulting force of the articulated lever mechanism 58 on the movable contact arm 36 is greatest when the contacts 16 and 18 are just touching when switched on. The distance between the piston 30 of the electromagnetic switching device 26 and the movable contact arm 36 is then the smallest. If the circuit breaker is switched on while there is a short circuit on the subsequent electrical lines, a greater force is required to trigger the switch. There is therefore a risk that the switch will not trip. To prevent this, the trigger force should be small with a small trigger stroke and larger with a larger trigger stroke. The trigger stroke is to be understood as the distance between the piston 30 and the locking element 44.

Ein anderer Nachteil des beschriebenen Schaltmechanismus ist das Ausklinken des Gelenkhebelmechanismus 58 (Fig. 3). Für den einwandfreien Betrieb sind zusätzliche Führungen auf der Rückwand des Gehäuses notwendig. Zudem ist die Form der Einzelteile recht aufwendig und es braucht spezielle Hilfsmittel bei der Montage des Schutzschalter. Unter anderem soll verhindert werden, dass der Schaltmechanismus infolge der Zugfeder 56 (Fig. 1) verkantet. Die Herstellung des Schutzschalters kann daher nur manuell geschehen.Another disadvantage of the switching mechanism described is notching the articulated lever mechanism 58 (FIG. 3). Additional guides on the rear wall of the housing are necessary for proper operation. In addition, the shape of the individual parts is quite complex and special aids are required when installing the circuit breaker. Among other things, it should be prevented that the switching mechanism jams as a result of the tension spring 56 (FIG. 1). The circuit breaker can therefore only be manufactured manually.

Aufgabe der Erfindung ist es nun, bei einem Schaltmechanismus der vorgenannten Art, das Zusammenwirken von Kniehebel und Auslösehebel so zu verbessern, dass der Schutzschalter beim Einschalten während eines Kurzschlusses mit weniger Kraft ausgelöst wird, als bei einem Kurzschluss im eingeschalteten Zustand. Diese Aufgabe wird bei einem Schaltmechanismus der obigen Art gelöst durch die Merkmale des Patentanspruchs 1.The object of the invention is now, in a switching mechanism of the aforementioned type, to improve the interaction of the toggle lever and release lever in such a way that the circuit breaker is triggered with less force when switched on during a short circuit than with a short circuit in the switched on state. This object is achieved in a switching mechanism of the above type by the features of patent claim 1.

Die Erfindung beruht auf der Erkenntnis, dass erst eine genaue Abstimmung der Kräfte,die auf den Schaltmechanismus wirken, eine optimale Funktion des Schutzschalters unter allen Bedingungen gewährleistet. Der Auslösehub des Schlagankers - d.h. die gesamte kinetische Energie, die vom Schlaganker freigegeben wird - kann dadurch wesentlich geringer sein als bei den herkömmlichen Schutzschaltern.The invention is based on the knowledge that only an exact coordination of the forces acting on the switching mechanism ensures an optimal function of the circuit breaker under all conditions. The stroke of the impact anchor - i.e. the total kinetic energy released by the impact anchor can therefore be significantly lower than with conventional circuit breakers.

Ein zusätzlicher Vorteil der Erfindung ist der automatengerechte Aufbau des Schaltmechanismus. Die Einzelteile des Schaltmechanismus sind so angefertigt, dass der Schutzschalter baugruppenweise von Fertigungsautomaten hergestellt werden kann. Beispielsweise braucht es im Schaltergehäuse keine zusätzliche Führung für den Kniehebel, da er ständig vom bewegbaren Kontaktteil umfasst wird. Der Führungsbügel und die Führung im Bodenteil des Gehäuses gewährleisten, dass der Schaltmechanismus auch während der Montage nicht verkantet.An additional advantage of the invention is the automatic construction of the switching mechanism. The individual parts of the switching mechanism are manufactured in such a way that the circuit breaker can be manufactured in assemblies by production machines. For example, no additional guidance for the toggle lever is required in the switch housing, since it is constantly surrounded by the movable contact part. The guide bracket and the guide in the bottom part of the housing ensure that the switching mechanism does not tilt even during assembly.

Weitere Vorteile der Erfindung folgen aus der nachstehenden Beschreibung. Dort wird die Erfindung anhand eines in der Zeichnung dargestellten Beispieles näher erläutert. Dabei zeigt:

Fig. 1
einen Ausschnitt eines Schutzschalters mit einem Schaltmechanismus, bei dem die Kontaktteile sich gerade berühren,
Fig. 1a
einen Querschnitt des Schutzschalters nach Fig. 1 gemäss der Linie A-A,
Fig. 2
einen Ausschnitt des Schutzschalters wie in Fig. 1, jedoch in eingeschaltetem Zustand, und
Fig. 3
einen Ausschnitt des Schutzschalters wie in Fig. 1, jedoch in ausgeschaltetem Zustand.
Further advantages of the invention follow from the description below. There, the invention is explained in more detail using an example shown in the drawing. It shows:
Fig. 1
a section of a circuit breaker with a switching mechanism in which the contact parts just touch,
Fig. 1a
2 shows a cross section of the circuit breaker according to FIG. 1 along the line AA,
Fig. 2
a section of the circuit breaker as in Fig. 1, but in the on state, and
Fig. 3
a section of the circuit breaker as in Fig. 1, but in the off state.

In Fig. 1 ist ein Teil eines Schutzschalters gezeigt, bei dem die Kontaktteile sich gerade berühren. Der Schaltmechanismus 1 ist in einem Gehäuse 2 untergebracht. Die Kontaktvorrichtung des Schutzschalters besteht aus einem bewegbaren Kontaktteil 3 und einem festen Kontaktteil 4. Der bewegbare Kontaktteil 3 wird von einer Kontaktfeder 5 von dem festen Kontaktteil 4 weggedrückt. Die Kontaktfeder 5 ist eine Schenkelfeder mit zwei längeren Enden. Das eine Ende liegt direkt an der Schmalseite des Gehäuses 2, und das andere Ende ist in ein Loch geführt, das sich oben am bewegbaren Kontaktteil 3 befindet. Ein Betätigungsorgan 6 - hier ein Kipphebel - wird von einer schraubenförmigen Rückstellfeder 7 in den ausgeschalteten Zustand gebracht. Das Betätigungsorgan 6 ist über einen Kniehebel 8 mit dem bewegbaren Kontaktteil 3 verbunden. Der Kniehebel 8 ist ein u-förmiger Bügel, der als Variante zu einem fast geschlossenen Rechteck ausgebildet sein kann, und der durch einen Schlitz 9 im oberen Teil des bewegbaren Kontaktteils 3 geführt ist. Ein Auslösehebel 10 ist drehbar mit dem bewegbaren Kontaktteil 3 verbunden. Zwischen dem unteren Ende des Auslösehebels 10 und dem bewegbaren Kontaktteil 3 ist eine Druckfeder 11 vorgesehen. Oben ist der Auslösehebel 10 verzweigt, wobei das rechte Ende mit einer Nase versehen ist, die den Kniehebel 8 im Normalfall oben im Schlitz 9 gefangenhält. Etwa in der Mitte des bewegbaren Kontaktteils 3 und des Auslösehebels 10 befinden sich deckungsgleiche Bohrungen. Der eine Schenkel eines u-förmigen Führungsbügels 12 bildet die Drehachse und ist durch die Bohrungen gesteckt. Der andere Schenkel ist von einer Führung 13 im Bodenteil des Gehäuses 2 eingefasst (vgl. auch Fig. 1a). Ein Schlaganker 14, der von einem - hier nicht dargestellten - Elektromagneten bewegt wird, und ein Thermo-Auslöser 15 wirken bei Kurzschluss oder bei Ueberstrom auf den Auslösehebel 10 ein. Eine Litze 16 verbindet der bewegbare Kontaktteil 3 mit dem Thermo-Auslöser 15. Ein Anschlag 17 im Gehäuse auf der Höhe des oberen Endes des bewegbaren Kontaktteils 3 beschränkt die Oeffnung des Kontaktes.In Fig. 1, a part of a circuit breaker is shown, in which the contact parts just touch. The switching mechanism 1 is housed in a housing 2. The contact device of the circuit breaker consists of a movable contact part 3 and a fixed contact part 4. The movable contact part 3 is pressed away from the fixed contact part 4 by a contact spring 5. The contact spring 5 is a leg spring with two longer ends. One end lies directly on the narrow side of the housing 2, and the other end is guided into a hole which is located on the top of the movable contact part 3. An actuator 6 - here a rocker arm - is brought into the switched-off state by a helical return spring 7. The actuator 6 is connected to the movable contact part 3 via a toggle lever 8. The toggle lever 8 is a U-shaped bracket, which can be designed as a variant of an almost closed rectangle, and which is guided through a slot 9 in the upper part of the movable contact part 3. A release lever 10 is rotatably connected to the movable contact part 3. A compression spring 11 is provided between the lower end of the release lever 10 and the movable contact part 3. The trigger lever 10 is branched at the top, the right end being provided with a nose which normally holds the knee lever 8 trapped in the slot 9 at the top. Approximately identical holes are located in the middle of the movable contact part 3 and the trigger lever 10. One leg of a U-shaped guide bracket 12 forms the axis of rotation and is inserted through the holes. The other leg is from a guide 13 is enclosed in the bottom part of the housing 2 (cf. also FIG. 1a). A striking armature 14, which is moved by an electromagnet (not shown here), and a thermal release 15 act on the release lever 10 in the event of a short circuit or overcurrent. A strand 16 connects the movable contact part 3 to the thermal release 15. A stop 17 in the housing at the level of the upper end of the movable contact part 3 limits the opening of the contact.

Fig. 1a ist ein Querschnitt des Schutzschalters gemäss der Linie A-A in Fig. 1. Es wurden dieselben Bezugszeichen für dieselben Elemente verwendet. Wie daraus ersichtlich, besteht der bewegbare Kontaktteil 3 aus zwei parallelen Teile, die auf der Rückseite miteinander verbunden sind. Dazwischen ist der Auslösehebel 10 angeordnet.Fig. 1a is a cross section of the circuit breaker along the line A-A in Fig. 1. The same reference numerals have been used for the same elements. As can be seen from this, the movable contact part 3 consists of two parallel parts which are connected to one another on the rear side. The release lever 10 is arranged in between.

In den Figuren 2 und 3 ist derselbe Schutzschalter dargestellt, und zwar im eingeschalteten und im ausgeschalteten Zustand. In Fig. 3 ist strichliert die Anordnung des Betätigungsorgans 6 und des Kniehebels 8 bei Freiauslösung angedeutet. Dies ist der Fall, wenn das Betätigungsorgan 6 in eingeschaltetem Zustand blockiert ist, und ein Kurzschluss oder Ueberstrom auftritt.The same circuit breaker is shown in FIGS. 2 and 3, in the switched-on and in the switched-off state. In Fig. 3 the arrangement of the actuating member 6 and the toggle lever 8 is indicated by a dashed line when released. This is the case when the actuator 6 is blocked in the switched-on state and a short circuit or overcurrent occurs.

In den Figuren 1 und 2 sind nun die Kräfte des Kniehebels 8 auf dem Auslösehebel 10 eingezeichnet. α ist der Winkel, der zwischen dem Kniehebel 8 und seiner Auflagefläche auf dem Auslösehebel 10 besteht, und der die resultierende Kraft in Richtung der Drehachse bestimmt. Mit B ist der Auslösehub des Schlagankers 14 angedeutet. Wie nun unmittelbar aus diesen Figuren folgt, ist der Winkel α - und somit die Auflagekraft auf die Verklinkung - beim Berühren der Kontaktteile 3 und 4 (Fig. 1) klein. Auch der Auslösehub B des Schlagankers 14 ist dort gering. Im eingeschalteten Zustand (Fig. 2) sind der Winkel α, die resultierende Kraft und der Auslösehub B grösser. Daher ist die kinetische Energie des Schlagankers 14, die vom Auslösehub B abhängig ist, gering, wenn die zu überwindende Kraft gering ist, und grösser, wenn diese Kraft grösser ist. Das bedeutet, dass der Schutzschalter beim Einschalten während eines Kurzschlusses genauso gut abschaltet, wie bei einem Kurzschluss im eingeschalteten Zustand.In Figures 1 and 2, the forces of the toggle lever 8 are now drawn on the trigger lever 10. α is the angle that exists between the toggle lever 8 and its bearing surface on the release lever 10 and that determines the resulting force in the direction of the axis of rotation. With B the trigger stroke of the impact anchor 14 is indicated. As follows immediately from these figures, the angle α - and thus the contact force on the latch - when touching the contact parts 3 and 4 (Fig. 1) is small. The trigger stroke B of the impact anchor 14 is also small there. In the switched-on state (FIG. 2), the angle α, the resulting force and the release stroke B are larger. Therefore, the kinetic energy of the impact anchor 14, which is dependent on the release stroke B, is low when the force to be overcome is small, and greater when this force is greater. This means that the circuit breaker switches off just as well when switched on during a short circuit as when a short circuit is switched on.

Es hat sich nun gezeigt, dass die obige Konstruktion der Einzelteile des Schaltmechanismus 1 besonders vorteilhaft ist für eine automatische Fertigung des Schutzschalters. Da insbesondere - ausser der Führung 13 - keine weitere Führungen im Gehäuse notwendig sind, können der bewegbare Kontaktteil 3, der Auslösehebel 10, die Druckfeder 11, der Führungsbügel 12, der Kniehebel 8 und das Betätigungsorgan 6 als erste Baugruppe in der Fertigung zusammengesetzt werden. Der derart aufgebaute Schaltmechanismus 1 kann dann verhältnismässig einfach in das Gehäuse 2 eingeschoben werden. Die übrigen Manipulationen können bei offenem Gehäuse ohne jedwelche Hilfsmittel ausgeführt werden, da der Führungsbügel 12 verhindert, dass der Schaltmechanismus 1 nicht mehr von der Kontaktfeder 5 verkantet werden kann.It has now been shown that the above construction of the individual parts of the switching mechanism 1 is particularly advantageous for automatic production of the circuit breaker. Since in particular - apart from the guide 13 - no further guides are necessary in the housing, the movable contact part 3, the release lever 10, the compression spring 11, the guide bracket 12, the toggle lever 8 and the actuating member 6 can be assembled as the first assembly in production. The switching mechanism 1 constructed in this way can then be pushed into the housing 2 relatively easily. The remaining manipulations can be carried out with the housing open without any aids, since the guide bracket 12 prevents the switching mechanism 1 from being tilted by the contact spring 5.

Claims (6)

  1. Switching mechanism (1) of a protective switch with a contact device comprising a movable and a fixed contact part (3,4), a contact spring (5), an actuating member (6) with a return spring (7), a release lever (10) on which act an impact armature (14) of an electromagnet, as well as a thermal cutout (15) and a toggle lever (8), whose one end is articulated to the actuating member (6), the movable contact part (3) and the release lever (10) being resiliently supported against one another and form a latch, in which can be latched the other end of the toggle lever whilst bearing on a bearing surface of the release lever (10) and in which the distance between the impact armature (14) and the release lever (10) which determines the release travel of said armature (14) is smaller if, on switching on, the fixed and movable contact parts just come into contact than in the fully switched-on state, characterized in that the bearing angle (α) under which the toggle lever (8) in the latched state rests on the bearing surface of the release lever (10) is smaller if, on switching on, the fixed contact part (4) and the movable contact part (3) just come into contact than in the fully switched-on state.
  2. Switching mechanism according to claim 1, characterized in that the other end of the toggle lever (8) is guided in a slot (9) on the upper end of the movable contact part (3).
  3. Switching mechanism according to claims 1 or 2, characterized in that the toggle lever (8) comprises a U-shaped clip or an almost closed rectangle.
  4. Switching mechanism according to one of the claims 1 to 2, characterized in that a guide fork (12) is provided, whose one leg forms the rotation axis of the movable contact part (3) and whose other leg is enclosed by a guide (13) in the casing.
  5. Switching mechanism according to one of the preceding claims, characterized in that the contact spring (5) is a spring clip, whose one end presses against the side wall of the switch casing (2) and whose other end presses against the movable contact part (3).
  6. Switching mechanism according to one of the preceding claims, characterized in that a compression spring (11) is provided between the movable contact part (3) and the release lever (10).
EP19870810418 1986-07-25 1987-07-27 Switching mechanism of a protective switch Expired - Lifetime EP0255483B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH299386A CH670330A5 (en) 1986-07-25 1986-07-25
CH2993/86 1986-07-25

Publications (3)

Publication Number Publication Date
EP0255483A2 EP0255483A2 (en) 1988-02-03
EP0255483A3 EP0255483A3 (en) 1989-12-13
EP0255483B1 true EP0255483B1 (en) 1993-03-10

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EP19870810418 Expired - Lifetime EP0255483B1 (en) 1986-07-25 1987-07-27 Switching mechanism of a protective switch

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CH (1) CH670330A5 (en)
DE (1) DE3784582D1 (en)

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DE102005038149A1 (en) 2005-08-12 2007-02-22 Abb Patent Gmbh Circuit breaker

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031482A1 (en) * 1980-08-21 1982-04-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt SWITCHING MECHANISM FOR CIRCUIT BREAKER
DE3335887C2 (en) * 1983-10-03 1986-08-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Switching mechanism for circuit breakers
EP0147629B1 (en) * 1983-12-17 1987-03-04 Lindner GmbH Fabrik elektrischer Lampen und Apparate Protective circuit breaker
US4628288A (en) * 1984-05-15 1986-12-09 Mitsubishi Denki Kabushiki Kaisha Circuit interrupter

Also Published As

Publication number Publication date
EP0255483A2 (en) 1988-02-03
DE3784582D1 (en) 1993-04-15
CH670330A5 (en) 1989-05-31
EP0255483A3 (en) 1989-12-13

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