EP0049209B1 - Protective switch of compact construction with a tripping pin - Google Patents

Protective switch of compact construction with a tripping pin Download PDF

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Publication number
EP0049209B1
EP0049209B1 EP81730083A EP81730083A EP0049209B1 EP 0049209 B1 EP0049209 B1 EP 0049209B1 EP 81730083 A EP81730083 A EP 81730083A EP 81730083 A EP81730083 A EP 81730083A EP 0049209 B1 EP0049209 B1 EP 0049209B1
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EP
European Patent Office
Prior art keywords
tripping
housing
pin
protective switch
groove
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
Application number
EP81730083A
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German (de)
French (fr)
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EP0049209A3 (en
EP0049209A2 (en
Inventor
Werner Ing. Grad. Troebel
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81730083T priority Critical patent/ATE13107T1/en
Publication of EP0049209A2 publication Critical patent/EP0049209A2/en
Publication of EP0049209A3 publication Critical patent/EP0049209A3/en
Application granted granted Critical
Publication of EP0049209B1 publication Critical patent/EP0049209B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/126—Automatic release mechanisms with or without manual release actuated by dismounting of circuit breaker or removal of part of circuit breaker

Definitions

  • the invention relates to a circuit breaker of compact design with an insulating housing, which has an upper part with an opening for the passage of an actuating handle and a lower part provided for resting on a fastening or mounting surface, and which has a switching mechanism and a release shaft interacting with it. which can be actuated except by current-dependent tripping elements by means of a tripping pin which emerges on the underside of the lower part and is displaceably guided in the housing against spring force.
  • a circuit breaker of this type emerges from EP-A1-0 035 083 and is part of the prior art in accordance with Article 54 (3), (4) EPC.
  • the release pin is used to inevitably trigger the circuit breaker when it is removed from its mounting surface.
  • An important area of application of the trip pins mentioned are therefore circuit breakers in a pluggable design, in the case of which arcing must be avoided when disconnecting contacts or removing them from a plug base.
  • the release pins are dimensioned in such a way that the switching mechanism is triggered with certainty before the connection pieces of the circuit breaker disengage from the isolating contacts or plug bases.
  • the invention has for its object to provide such a space-saving arrangement of a trigger pin of the type mentioned, which enables the use of trigger pins even with circuit breakers with maximum use of space in their housing.
  • this object is achieved with a circuit breaker of the type mentioned at the outset in that the trigger pin is mounted in a groove of an outer wall of the housing which is open to the interior of the housing and has an offset near the trigger shaft and on the bent part has an approach which interacts with the trigger shaft . Due to the mounting in the groove, the release pin is guided past the other components of the circuit breaker, which allows the previous structure to be retained in full. This also applies to the trigger shaft, because the required mechanical interaction is made possible by the cranking of the trigger pin. In addition, the offset allows within certain limits the arrangement of the groove at a location that appears favorable due to the internal geometry of the circuit breaker and the mechanical strength.
  • a recess can be arranged for receiving the end of a helical compression spring which prestresses the release pin in the direction of the release, in the windings of which the release pin engages with one end. In this way, a flexible guide is created with respect to the upper part of the housing, which effects a tolerance compensation.
  • the approach of the release pin can also serve as an abutment for the helical compression spring and then fulfills a second function in addition to acting on the release shaft.
  • the groove provided for guiding the release pin can only be provided in the lower part of the housing and can have boundary surfaces which, together with at least one extension of the release pin, limit rotation of the release pin in the groove.
  • the approach just explained can limit the stroke of the trigger pin when the circuit breaker is lifted from its fastening or mounting surface by a stop on a counter surface of the housing to a sufficient extent to actuate the trigger shaft.
  • a dual function is achieved through a sensible shaping of the release pin.
  • the circuit breaker 1 in Fig. 1 which may have a structure as described approximately in DE-A-2 816 352, has a housing 2 made of an insulating material with an upper part 3 and a lower part 4, on the end faces of which in the present example with Knife contacts 5 and 6 provided connecting devices 7 and 10 are arranged.
  • An actuating handle 11 protrudes from an opening in the upper part 3 of the housing 2 and is used to switch the circuit breaker 1 on and off manually.
  • the circuit breaker can also be triggered automatically by overcurrent and short-circuit releases.
  • 1 shows a bimetallic strip 12 of the components of the release system, which is connected at its lower end to a heating conductor 13 and runs approximately parallel to it at a short distance.
  • the heating conductor 13 is ver with a conductor piece 14 bound, which is attached directly to the connecting device 7.
  • the arrangement consisting of heating conductor and bimetallic strip is located between the legs of a U-shaped magnetic yoke 15, with the pole surfaces of which a release armature 16 pivotably mounted in the lower part 4 of the housing 2 interacts.
  • the bimetallic strip 12 and the release armature 16 serve to influence a release shaft 17, which is connected in a manner not shown to the switching mechanism via intermediate members. Details of this arrangement are e.g. B. from the mentioned publication.
  • the circuit breaker 1 is provided with a trigger pin 20 which is slidably mounted in a groove 21 of the housing 2.
  • the groove 21 is located in an outer wall 22 (FIG. 2) of the lower part 4 of the housing 2 and has a cross section such that the trigger pin 20, which is of circular cross section, is approximately flush with the inner surface 23 of the outer wall 22.
  • In the lower part 4 there is a bore 18 through which the trigger pin passes. In the idle state it lies with the protruding end 24 on the assembly surface 25 shown in broken lines, e.g. the base plate of a plug-in base.
  • the trigger pin 20 is provided with an offset 26, through which the upper part 27 of the trigger pin 20 both after the interior of the housing 2 and laterally offset.
  • an extension 30 which, in the rest position shown, is at a distance from an extension 31 of the release shaft 17 and at the same time forms an abutment of the lower end of a helical compression spring 32.
  • the opposite end of this spring is located in a recess 33 of the upper part 3 of the housing 2.
  • the release pin 20 When inserted into the groove 21, the release pin 20 inevitably takes the direction of the upper part required for the interaction of the extension 30 with the release shaft 17 and the engagement in the helical compression spring 32 27 a.
  • the release pin 20 In the idle state shown in FIG. 1, the release pin 20 is held against the action of the helical compression spring 32 in a position in which the extension 30 is at a distance from the extension 31 of the release shaft 17.
  • the trigger pin 20 moves to the same extent under the influence of the helical compression spring 32 and actuates the trigger shaft 17 with its extension 30, even before the knife contacts 5 and 6 from the ones not shown , stationary counter contacts interacting with them can emerge.
  • the rotation of the trigger shaft then releases the switching mechanism and thus opens the switching contacts.
  • the trigger pin 20 therefore has the function of a safety device, which prevents arcing of the knife contacts 5 and 6 and brings about a safe interruption of the circuit inside the circuit breaker 1 for the operator.
  • the trigger pin has proven to be advantageous to produce the trigger pin as a uniform body from a suitable plastic by injection molding. It gets its final shape in one operation, has good mechanical strength and avoids insulation problems inside the circuit breaker.

Abstract

1. A protective switch (1) of compact construction having an insulating housing which has an upper part (3) with an opening which serves for the passage of an operating lever (11), and a lower part (4) which is provided for support on a fixing or assembly surface (25), and having a switching mechanism and a tripping bar (17) which cooperates therewith and which, apart from current-dependent tripping elements (12, 16), can be operated by a tripping pin (20) which protrudes at the underside of the lower part (4) and is guided in the housing (2) so as to be displaceable against spring force, characterised in that the tripping pin (20) has both an offset member which is near to the tripping bar (17) and is positioned in a groove (21) in an outer wall of the housing (2) which opens towards the inside of the housing (2), and an attachment (30), on the offset component (27), which co-operates with the tripping bar (17).

Description

Die Erfindung befasst sich mit einem Schutzschalter kompakter Bauart mit einem Isolierstoffgehäuse, das ein Oberteil mit einer zum Durchtritt eines Betätigungshandgriffes dienenden Öffnung und ein zur Auflage auf einer Befestigungs- oder Montagefläche vorgesehenes Unterteil aufweist, und der einen Schaltmechanismus und eine mit diesem zusammenwirkende Auslösewelle besitzt, die ausser durch stromabhängige Auslöseglieder durch einen an der Unterseite des Unterteiles austretenden, in dem Gehäuse gegen Federkraft verschiebbar geführten Auslösestift betätigbar ist. Ein Schutzschalter dieser Art geht aus der EP-A1-0 035 083 hervor und gehört gemäss Artikel 54(3), (4) EPÜ zum Stand der Technik.The invention relates to a circuit breaker of compact design with an insulating housing, which has an upper part with an opening for the passage of an actuating handle and a lower part provided for resting on a fastening or mounting surface, and which has a switching mechanism and a release shaft interacting with it. which can be actuated except by current-dependent tripping elements by means of a tripping pin which emerges on the underside of the lower part and is displaceably guided in the housing against spring force. A circuit breaker of this type emerges from EP-A1-0 035 083 and is part of the prior art in accordance with Article 54 (3), (4) EPC.

Der Auslösestift dient dazu, zwangsläufig eine Auslösung des Schutzschalters zu veranlassen, wenn dieser von seiner Montagefläche abgenommen wird. Ein wichtiges Anwendungsgebiet der genannten Auslösestifte sind daher Schutzschalter in steckbarer Ausführung, bei deren Lösung von den Trennkontakten bzw. Herausnahme aus einem Stecksockel eine Lichtbogenbildung unterbleiben muss. Hierzu werden die Auslösestifte derart bemessen, dass der Schaltmechanismus mit Sicherheit ausgelöst wird, bevor die Anschlussstücke des Schutzschalters ausser Eingriff mit den Trennkontakten bzw. Stecksockeln gelangen.The release pin is used to inevitably trigger the circuit breaker when it is removed from its mounting surface. An important area of application of the trip pins mentioned are therefore circuit breakers in a pluggable design, in the case of which arcing must be avoided when disconnecting contacts or removing them from a plug base. For this purpose, the release pins are dimensioned in such a way that the switching mechanism is triggered with certainty before the connection pieces of the circuit breaker disengage from the isolating contacts or plug bases.

Im Prinzip bereitet der Einbau eines Auslösestiftes der genannten Art in einen Schutzschalter keine Schwierigkeiten, sofern ausreichend Platz zur Verfügung steht. Dies ist jedoch besonders bei Schutzschaltern der kleineren Baugrössen, deren Nennstrom z. B. zwischen 60 und 250 Ampere liegt, in der Regel nicht der Fall. Vielmehr nimmt bei solchen Schaltern der Schaltmechanismus mit den Schaltkontakten, Löschkammern, Auslösern und Zusatzteilen praktisch den gesamten Innenraum der Schaltergehäuse ein.In principle, the installation of a trigger pin of the type mentioned in a circuit breaker is not difficult if there is sufficient space available. However, this is particularly the case with circuit breakers of smaller sizes, the rated current of which, for. B. is between 60 and 250 amps, usually not the case. Rather, in such switches, the switching mechanism with the switching contacts, arcing chambers, triggers and additional parts practically occupies the entire interior of the switch housing.

Der Erfindung liegt die Aufgabe zugrunde, eine derart raumsparende Anordnung eines Auslösestiftes der genannten Art anzugeben, die eine Anwendung von Auslösestiften auch bei Schutzschaltern mit höchster Raumausnutzung ihrer Gehäuse ermöglicht.The invention has for its object to provide such a space-saving arrangement of a trigger pin of the type mentioned, which enables the use of trigger pins even with circuit breakers with maximum use of space in their housing.

Gemäss der Erfindung wird diese Aufgabe bei einem Schutzschalter der eingangs genannten Art dadurch gelöst, dass der Auslösestift in einer zum Inneren des Gehäuses offenen Nut einer Aussenwand des Gehäuses gelagert und nahe der Auslösewelle eine Abkröpfung sowie an dem abgekröpften Teil einen mit der Auslösewelle zusammenwirkenden Ansatz besitzt. Durch die Lagerung in der Nut wird der Auslösestift seitlich an den anderen Bauteilen des Schutzschalters vorbeigeführt, was die vollständige Beibehaltung des bisherigen Aufbaus gestattet. Dies gilt auch für die Auslösewelle, weil hier das erforderliche mechanische Zusammenwirken durch die Abkröpfung des Auslösestiftes ermöglicht wird. Die Abkröpfung erlaubt darüber hinaus in gewissen Grenzen die Anordnung der Nut an einer Stelle, die aus Gründen der inneren Geometrie des Schutzschalters und der mechanischen Festigkeit günstig erscheint.According to the invention, this object is achieved with a circuit breaker of the type mentioned at the outset in that the trigger pin is mounted in a groove of an outer wall of the housing which is open to the interior of the housing and has an offset near the trigger shaft and on the bent part has an approach which interacts with the trigger shaft . Due to the mounting in the groove, the release pin is guided past the other components of the circuit breaker, which allows the previous structure to be retained in full. This also applies to the trigger shaft, because the required mechanical interaction is made possible by the cranking of the trigger pin. In addition, the offset allows within certain limits the arrangement of the groove at a location that appears favorable due to the internal geometry of the circuit breaker and the mechanical strength.

Im Oberteil des Gehäuses des Schutzschalters kann eine Ausnehmung zur Aufnahme des Endes einer den Auslösestift in der Richtung der Auslösung vorspannenden Schrauben-Druckfeder angeordnet sein, in deren Windungen der Auslösestift mit seinem einen Ende eingreift. Auf diese Weise ist gegenüber dem Oberteil des Gehäuses eine nachgiebige Führung geschaffen, die einen Toleranzausgleich bewirkt.In the upper part of the housing of the circuit breaker, a recess can be arranged for receiving the end of a helical compression spring which prestresses the release pin in the direction of the release, in the windings of which the release pin engages with one end. In this way, a flexible guide is created with respect to the upper part of the housing, which effects a tolerance compensation.

Der Ansatz des Auslösestiftes kann zugleich als Widerlager der Schrauben-Druckfeder dienen und erfüllt dann neben der Einwirkung auf die Auslösewelle noch eine zweite Funktion.The approach of the release pin can also serve as an abutment for the helical compression spring and then fulfills a second function in addition to acting on the release shaft.

Nach einer Weiterbildung der Erfindung kann die zur Führung des Auslösestiftes vorgesehene Nut nur im Unterteil des Gehäuses vorgesehen sein und kann Begrenzungsflächen besitzen, die zusammen mit wenigstens einem Ansatz des Auslösestiftes eine Verdrehung des Auslösestiftes in der Nut begrenzen. Hat der Auslösestift z. B. einen kreisförmigen Querschnitt, wie dies für seine Herstellung und die Lagerung in der Nut günstig ist, so ist schon durch einen einzigen rechteckigen Ansatz ein Verdrehungsschutz zu erreichen.According to a development of the invention, the groove provided for guiding the release pin can only be provided in the lower part of the housing and can have boundary surfaces which, together with at least one extension of the release pin, limit rotation of the release pin in the groove. Has the trigger pin z. B. a circular cross-section, as is favorable for its manufacture and storage in the groove, a twist protection can be achieved with a single rectangular approach.

Der soeben erläuterte Ansatz kann durch seine Anordnung den Hub des Auslösestiftes beim Abheben des Schutzschalters von seiner Befestigungs- oder Montagefläche durch Anschlag an einer Gegenfläche des Gehäuses auf ein zur Betätigung der Auslösewelle ausreichendes Mass begrenzen. Auch hier wird somit durch eine sinnvolle Formgebung des Auslösestiftes eine Doppelfunktion erreicht.Due to its arrangement, the approach just explained can limit the stroke of the trigger pin when the circuit breaker is lifted from its fastening or mounting surface by a stop on a counter surface of the housing to a sufficient extent to actuate the trigger shaft. Here too, a dual function is achieved through a sensible shaping of the release pin.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert.

  • Die Figur 1 zeigt einen Schutzschalter der Kompaktbauart in der Seitenansicht, teilweise im Schnitt.
  • In der Figur 2 ist der Schutzschalter gemäss der Figur 1 in der Draufsicht mit einer stellenweise im Schnitt gezeigten Aussenwand dargestellt.
  • Die Figur 3 zeigt einen Ausschnitt der Aussenwand des Gehäuses mit einem Auslösestift.
The invention is explained below with reference to the embodiment shown in the figures.
  • Figure 1 shows a circuit breaker of the compact design in side view, partly in section.
  • FIG. 2 shows the circuit breaker according to FIG. 1 in plan view with an outer wall shown in places in section.
  • Figure 3 shows a section of the outer wall of the housing with a release pin.

Der Schutzschalter 1 in Fig. 1, der insgesamt einen etwa in der DE-A-2 816 352 beschriebenen Aufbau haben kann, besitzt ein aus einem Isolierstoff bestehendes Gehäuse 2 mit einem Oberteil 3 und einem Unterteil 4, an dessen Stirnseiten im vorliegenden Beispiel mit Messerkontakten 5 und 6 versehene Anschlussvorrichtungen 7 und 10 angeordnet sind. Aus einer Öffnung in dem Oberteil 3 des Gehäuses 2 ragt ein Betätigungshandgriff 11 heraus, der zum Ein- und Ausschalten des Schutzschalters 1 von Hand dient. Ferner ist der Schutzschalter selbsttätig durch Überstrom- und Kurzschlussauslöser auslösbar. Von den Bestandteilen des Auslösesystems zeigt die Figur 1 einen Bimetallstreifen 12, der an seinem unteren Ende mit einem Heizleiter 13 verbunden ist und etwa parallel zu diesem mit geringem Abstand verläuft. Der Heizleiter 13 ist mit einem Leiterstück 14 verbunden, das direkt an der Anschlussvorrichtung 7 befestigt ist. Die aus Heizleiter und Bimetallstreifen bestehende Anordnung befindetsich zwischen den Schenkeln eines U-förmig gestalteten Magnetjoches 15, mit dessen Polflächen ein in dem Unterteil 4 des Gehäuses 2 schwenkbar gelagerter Auslöseanker 16 zusammenwirkt. Der Bimetallstreifen 12 und der Auslöseanker 16 dienen zur Beeinflussung einer Auslösewelle 17, die in nicht näher dargestellter Weise mit dem Schaltmechanismus über Zwischenglieder in Verbindung steht. Einzelheiten dieser Anordnung sind z. B. der erwähnten Offenlegungsschrift zu entnehmen.The circuit breaker 1 in Fig. 1, which may have a structure as described approximately in DE-A-2 816 352, has a housing 2 made of an insulating material with an upper part 3 and a lower part 4, on the end faces of which in the present example with Knife contacts 5 and 6 provided connecting devices 7 and 10 are arranged. An actuating handle 11 protrudes from an opening in the upper part 3 of the housing 2 and is used to switch the circuit breaker 1 on and off manually. The circuit breaker can also be triggered automatically by overcurrent and short-circuit releases. 1 shows a bimetallic strip 12 of the components of the release system, which is connected at its lower end to a heating conductor 13 and runs approximately parallel to it at a short distance. The heating conductor 13 is ver with a conductor piece 14 bound, which is attached directly to the connecting device 7. The arrangement consisting of heating conductor and bimetallic strip is located between the legs of a U-shaped magnetic yoke 15, with the pole surfaces of which a release armature 16 pivotably mounted in the lower part 4 of the housing 2 interacts. The bimetallic strip 12 and the release armature 16 serve to influence a release shaft 17, which is connected in a manner not shown to the switching mechanism via intermediate members. Details of this arrangement are e.g. B. from the mentioned publication.

Der Schutzschalter 1 ist mit einem Auslösestift 20 versehen, der in einer Nut 21 des Gehäuses 2 verschiebbar gelagert ist. Die Nut 21 befindet sich in einer Aussenwand 22 (Fig. 2) des Unterteiles 4 des Gehäuses 2 und besitzt einen solchen Querschnitt, dass der mit kreisförmigem Querschnitt ausgeführte Auslösestift 20 etwa bündig mit der Innenfläche 23 der Aussenwand 22 abschliesst. In dem Unterteil 4 befindet sich eine Bohrung 18, durch die der Auslösestift hindurchtritt. Im Ruhezustand liegt er mit dem überstehenden Ende 24 auf der strichpunktiert gezeigten Montagefläche 25, z.B. der Sockelplatte eines Stecksockels, auf.The circuit breaker 1 is provided with a trigger pin 20 which is slidably mounted in a groove 21 of the housing 2. The groove 21 is located in an outer wall 22 (FIG. 2) of the lower part 4 of the housing 2 and has a cross section such that the trigger pin 20, which is of circular cross section, is approximately flush with the inner surface 23 of the outer wall 22. In the lower part 4 there is a bore 18 through which the trigger pin passes. In the idle state it lies with the protruding end 24 on the assembly surface 25 shown in broken lines, e.g. the base plate of a plug-in base.

Im Bereich der Auslösewelle 17, die in einem an dem Unterteil 4 befestigten Lagerbock gelagert ist und sich in dem von dem Oberteil 3 umschlossenen Raum befindet, ist der Auslösestift 20 mit einer Abkröpfung 26 versehen, durch die der obere Teil 27 des Auslösestiftes 20 einen sowohl nach dem Inneren des Gehäuses 2 als auch seitlich gerichteten Versatz erhält. An diesem oberen Teil 27 des Auslösestiftes befindet sich ein Fortsatz 30, der in der gezeigten Ruhestellung mit Abstand einem Fortsatz 31 der Auslösewelle 17 gegenübersteht und zugleich ein Widerlager des unteren Endes einer Schrauben-Druckfeder 32 bildet. Das gegenüberliegende Ende dieser Feder befindet sich in einer Ausnehmung 33 des Oberteiles 3 des Gehäuses 2. Durch das Eingreifen des oberen Teiles 27 des Auslösestiftes 20 in die Windungen der Schrauben-Druckfeder 32 ist eine elastische und daher einen Toleranzausgleich bewirkende Führung des Auslösestiftes gewährleistet.In the area of the trigger shaft 17, which is mounted in a bearing block fastened to the lower part 4 and is located in the space enclosed by the upper part 3, the trigger pin 20 is provided with an offset 26, through which the upper part 27 of the trigger pin 20 both after the interior of the housing 2 and laterally offset. On this upper part 27 of the release pin there is an extension 30 which, in the rest position shown, is at a distance from an extension 31 of the release shaft 17 and at the same time forms an abutment of the lower end of a helical compression spring 32. The opposite end of this spring is located in a recess 33 of the upper part 3 of the housing 2. The engagement of the upper part 27 of the release pin 20 in the windings of the helical compression spring 32 ensures an elastic and therefore tolerance compensation guiding of the release pin.

Der an den Begrenzungsflächen 28 und 29 der Nut 21 des Unterteiles 4 des Gehäuses 2 geführte untere Teil des Auslösestiftes 20 ist an wenigstens einer Stelle mit einem rechteckigen Ansatz 34 gemäss der Figur 3 versehen, die den Auslösestift zusammen mit einem Abschnitt der Aussenwand 22 darstellt. Durch den Ansatz 34, dessen Breite dem Abstand der parallelen Begrenzungsflächen 28 und 29 der Nut 21 angepasst oder geringer bemessen ist, wird ein Schutz gegen Verdrehung des Auslösestiftes erreicht. Günstig hierfür ist eine Verbreiterung der Begrenzungsfläche 29 entsprechend der Figur 2. Beim Einlegen in die Nut 21 nimmt der Auslösestift 20 somit zwangsläufig die für das Zusammenwirken des Fortsatzes 30 mit der Auslösewelle 17 und das Eingreifen in die Schrauben-Druckfeder 32 erforderliche Richtung des oberen Teiles 27 ein.The lower part of the trigger pin 20, which is guided on the boundary surfaces 28 and 29 of the groove 21 of the lower part 4 of the housing 2, is provided at least at one point with a rectangular extension 34 according to FIG. 3, which represents the trigger pin together with a section of the outer wall 22. Protection against rotation of the trigger pin is achieved by the extension 34, the width of which is adapted to or smaller than the distance between the parallel boundary surfaces 28 and 29 of the groove 21. A widening of the boundary surface 29 in accordance with FIG. 2 is favorable for this. When inserted into the groove 21, the release pin 20 inevitably takes the direction of the upper part required for the interaction of the extension 30 with the release shaft 17 and the engagement in the helical compression spring 32 27 a.

In dem in der Figur 1 gezeigten Ruhezustand wird der Auslösestift 20 entgegen der Wirkung der Schrauben-Druckfeder 32 in einer Stellung gehalten, in der sich der Fortsatz 30 im Abstand von dem Fortsatz 31 der Auslösewelle 17 befindet. Wird jedoch der Schutzschalter 1 von seiner Montagefläche 25 abgehoben, so verschiebt sich unter dem Einfluss der Schrauben-Druckfeder 32 in dem gleichen Mass der Auslösestift 20 und betätigt mit seinem Fortsatz 30 die Auslösewelle 17, noch bevor die Messerkontakte 5 und 6 aus den nicht dargestellten, mit ihnen zusammenwirkenden ortsfesten Gegenkontakten heraustreten können. In an sich bekannter Weise bewirkt dann die Verdrehung der Auslösewelle die Freigabe des Schaltmechanismus und damit die Öffnung der Schaltkontakte. Der Auslösestift 20 hat daher die Funktion eines Sicherheitsorgans, das eine Lichtbogenbildung an den Messerkontakten 5 und 6 verhindert und eine für den Bedienenden sichere Unterbrechung des Stromkreises im Inneren des Schutzschalters 1 herbeiführt.In the idle state shown in FIG. 1, the release pin 20 is held against the action of the helical compression spring 32 in a position in which the extension 30 is at a distance from the extension 31 of the release shaft 17. However, if the circuit breaker 1 is lifted from its mounting surface 25, the trigger pin 20 moves to the same extent under the influence of the helical compression spring 32 and actuates the trigger shaft 17 with its extension 30, even before the knife contacts 5 and 6 from the ones not shown , stationary counter contacts interacting with them can emerge. In a manner known per se, the rotation of the trigger shaft then releases the switching mechanism and thus opens the switching contacts. The trigger pin 20 therefore has the function of a safety device, which prevents arcing of the knife contacts 5 and 6 and brings about a safe interruption of the circuit inside the circuit breaker 1 for the operator.

Es hat sich als vorteilhaft erwiesen, den Auslösestift als einheitlichen Körper aus einem geeigneten Kunststoff im Spritzgussverfahren herzustellen. Er erhält hierbei seine endgültige Gestalt in einem Arbeitsgang, besitzt eine gute mechanische Festigkeit und vermeidet Isolationsprobleme im Inneren des Schutzschalters.It has proven to be advantageous to produce the trigger pin as a uniform body from a suitable plastic by injection molding. It gets its final shape in one operation, has good mechanical strength and avoids insulation problems inside the circuit breaker.

Claims (5)

1. A protective switch (1) of compact construction having an insulating housing which has an upper part (3) with an opening which serves for the passage of an operating lever (11), and a lower part (4) which is provided for support on a fixing or assembly surface (25), and having a switching mechanism and a tripping bar (17) which co-operates therewith and which, apart from current- dependent tripping elements (12, 16), can be operated by a tripping pin (20) which protrudes at the underside of the lower part (4) and is guided in the housing (2) so as to be displaceable against spring force, characterised in that the tripping pin (20) has both an offset member which is near to the tripping bar (17) and is positioned in a groove (21) in an outer wall of the housing (2) which opens towards the inside of the housing (2), and an attachment (30), on the offset component (27), which co-operates with the tripping bar (17).
2. A protective switch as claimed in Claim 1, characterised in that, in the upper part (3) of the housing (2), there is arranged a recess (33) which serves to accommodate the end of a compression spring (32) which preloads the tripping pin (20) in the direction of tripping; and that at its one end the tripping pin (20) engages into the windings of the compression spring (32).
3. A protective switch as claimed in Claim 2, characterised in that the attachment (30) simultaneously serves as an abutment for the compression spring (32).
4. A protective switch as claimed in Claim 1, characterised in that the groove (21) is only arranged in the lower part (4) of the housing (2) and has boundary surfaces (28, 29) which, together with at least one attachment (34) of the tripping pin (20), limit rotation of the tripping pin (20) in the groove (21).
5. A protective switch as claimed in Claim 4, characterised in that, by its arrangement, the attachment (34) delimits the stroke of the tripping pin (20) when lifting the protective switch (1) from its mounting or assembly surface (25), by striking against a counter-surface of the housing (2), to an extent which is sufficient for the actuation of the tripping bar (17).
EP81730083A 1980-09-30 1981-09-01 Protective switch of compact construction with a tripping pin Expired EP0049209B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730083T ATE13107T1 (en) 1980-09-30 1981-09-01 COMPACT CIRCUIT BREAKER WITH ONE TRIP PIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3037355A DE3037355C2 (en) 1980-09-30 1980-09-30 Compact design circuit breaker with a trip pin
DE3037355 1980-09-30

Publications (3)

Publication Number Publication Date
EP0049209A2 EP0049209A2 (en) 1982-04-07
EP0049209A3 EP0049209A3 (en) 1982-12-29
EP0049209B1 true EP0049209B1 (en) 1985-05-02

Family

ID=6113486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730083A Expired EP0049209B1 (en) 1980-09-30 1981-09-01 Protective switch of compact construction with a tripping pin

Country Status (5)

Country Link
EP (1) EP0049209B1 (en)
JP (1) JPS5790836A (en)
AT (1) ATE13107T1 (en)
DE (1) DE3037355C2 (en)
ES (1) ES8206908A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101532C2 (en) * 1981-01-15 1984-11-29 Siemens AG, 1000 Berlin und 8000 München Plug-in base for low-voltage circuit breakers
DE3526336A1 (en) * 1985-07-23 1987-01-29 Weber Ag Fab Elektro Two-pole protection circuit breaker having a mechanical safety trip device
US4829278A (en) * 1988-08-03 1989-05-09 Westinghouse Electric Corp. Circuit breaker trip bar interlock
DE8905506U1 (en) * 1989-05-02 1990-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US4963846A (en) * 1989-08-04 1990-10-16 Westinghouse Electric Corp. Trip interlock design
GB9105111D0 (en) * 1991-03-11 1991-04-24 Otter Controls Ltd Improvements relating to thermally-responsive switches
DE4138183A1 (en) * 1991-11-15 1993-05-19 Siemens Ag RELEASE DEVICE FOR SWITCHGEAR ON PLUG BASE
FR2690563B1 (en) * 1992-04-23 1997-05-09 Merlin Gerin PLUG-IN CIRCUIT BREAKER WITH MOLDED HOUSING.
KR940007922A (en) * 1992-09-28 1994-04-28 기타오카 다카시 Circuit breaker
DE19512830A1 (en) * 1995-04-06 1996-10-10 Aeg Niederspannungstech Gmbh Locking device
DE29506151U1 (en) * 1995-04-08 1995-06-22 Kloeckner Moeller Gmbh Safety device for a switchgear with switch lock that can be mounted on a mounting surface

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590180A (en) * 1970-02-06 1971-06-29 Square D Co Manually operated toggle-acting switch having a means for preventing assembly of the switch with the contacts of the switch in a circuit-closing condition
US3688237A (en) * 1970-04-13 1972-08-29 Westinghouse Electric Corp Fused circuit breaker
JPS5625156Y2 (en) * 1976-01-29 1981-06-13
US4068200A (en) * 1976-04-28 1978-01-10 Gould Inc. Combination cover interlock and trip actuator
DE2816352C2 (en) * 1978-04-12 1982-12-16 Siemens AG, 1000 Berlin und 8000 München Low voltage circuit breaker with arcing compartment and switching mechanism
DE3008249C2 (en) * 1980-02-29 1984-04-12 Siemens AG, 1000 Berlin und 8000 München Circuit breaker with a manually movable trigger

Also Published As

Publication number Publication date
ES505870A0 (en) 1982-08-16
DE3037355C2 (en) 1982-11-04
EP0049209A3 (en) 1982-12-29
JPS5790836A (en) 1982-06-05
EP0049209A2 (en) 1982-04-07
ES8206908A1 (en) 1982-08-16
DE3037355A1 (en) 1982-04-29
ATE13107T1 (en) 1985-05-15

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