EP0219449B1 - Contact arrangement for a low-voltage circuit breaker with a flexible current conductor - Google Patents

Contact arrangement for a low-voltage circuit breaker with a flexible current conductor Download PDF

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Publication number
EP0219449B1
EP0219449B1 EP86730133A EP86730133A EP0219449B1 EP 0219449 B1 EP0219449 B1 EP 0219449B1 EP 86730133 A EP86730133 A EP 86730133A EP 86730133 A EP86730133 A EP 86730133A EP 0219449 B1 EP0219449 B1 EP 0219449B1
Authority
EP
European Patent Office
Prior art keywords
current
contact arrangement
contact
spacer
holder
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
EP86730133A
Other languages
German (de)
French (fr)
Other versions
EP0219449A1 (en
Inventor
Reinhard Dipl.-Ing. Kugler
Bernd Dipl.-Phys. Rambotzki
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0219449A1 publication Critical patent/EP0219449A1/en
Application granted granted Critical
Publication of EP0219449B1 publication Critical patent/EP0219449B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H01H2001/228—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars with insulating spacers between the contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H01H2001/5827—Laminated connections, i.e. the flexible conductor is composed of a plurality of thin flexible conducting layers

Definitions

  • the invention relates to a contact arrangement for low-voltage circuit breakers with a pivotably mounted holder for a movably arranged switching lever, which is connected to a fixed connection point by a flexible current band.
  • a contact arrangement of this type is known for example from DE-A-1 220 923.
  • a multi-pole circuit breaker there is a holder for each pole with a movable switching lever and a flexible current band. If a low-voltage circuit breaker for a higher rated current is to be created on this basis, the usual way can be to provide two or more identical contact levers with associated current strips in a common holder for each pole instead of a single one.
  • Current forces which remain without harmful consequences, act on these parts, which are arranged spatially in parallel and through which parallel currents flow, provided there is a sufficient distance between the parts, since the forces depend on the distance.
  • the current strips are layered from thin, hard-rolled copper sheets, which are connected at their ends by welding, soldering or other suitable methods. Since the current forces act transversely to the stratification of the metal sheets, they can be deformed or torn at their fastening points, which can lead to increasing heating and ultimately to damage and failure of the switch.
  • the object of the present invention is to enable the current bands to be as close as possible to one another without sacrificing mobility and thus to contribute to creating a space-saving and powerful contact arrangement.
  • this object is achieved in that an insulating spacer supported on the holder is arranged in a parallel arrangement of two or more current paths per pole between the current bands.
  • This spacer supports the adjacent current strips and thus prevents excessive bending under the influence of the attractive forces that act at high currents. As a result of the attachment of the spacer to the holder, the relative movements between the current strips and the spacer remain small.
  • the spacer is movably mounted with an opening on the bearing pin forming the pivot bearing of the holder.
  • the spacer can have particularly small dimensions with this attachment, which is favorable for the size and the weight of the spacer.
  • the spacer can also have a contact surface for each current band and a stop surface to limit the mobility of the spacer relative to a stationary counterpart. It is thereby achieved that the current bands cannot bend freely under the influence of the current forces in a loop-shaped design, such that the current forces only act on one leg of each current band. This can be used to exert a force compensating the contact-lifting forces on the contact levers. This force is supported on the holder of the contact arrangement via the stop surface.
  • the spacer can be designed in a pocket-like manner by means of a protective arch adjoining the contact surface, on the one hand to protect the current strips and on the other hand to collect individual sheets of the current strips if these should be broken under extreme stress on the circuit breaker. This prevents the metal sheets from spreading far apart from the current band and coming into contact with earthed parts of the circuit breaker.
  • Figure 1 shows the current path of a pole of a low-voltage circuit breaker, partly in section.
  • a spacer is shown in Figure 2 as a single part.
  • FIG. 3 shows a section A-B of the spacer according to FIG. 2.
  • the current path shown in FIG. 1 has an insulating material part 10 as a carrier of an upper forked connecting rail 11 and a lower, likewise forked connecting rail 12. With this is a flexible current band 13 in conductive connection, which forms the power supply to a contact lever 14 shown in section.
  • the current band 13 extends to a contact carrier 15, on which a contact pad 16 is located.
  • the insulating material carrier 10 contains a pressed-in threaded bushing 17, into which a clamping screw 20 passing through the current strip 13 and the connecting bar 12 is screwed.
  • the contact lever 14 is pivotally held about a hinge pin 21 on a support 22, which in turn is pivotable about a bearing pin 23.
  • a drive lever 24 which is connected in a manner not shown to a drive device and which acts on a hinge pin 25 passing through the support 22, the support 22 is pivoted with the contact lever 14 for switching on and off.
  • the contact lever 14 rests with its contact pad 16 on a stationary contact pad 26, which also rests on one is attached to the insulating carrier 10 by a clamping screw 27 attached contact carrier 30.
  • the contact carrier is conductively connected to the upper connecting rail 11 by the clamping screw 27.
  • the current bath 13 is loop-shaped in its lower region and thereby surrounds the bearing pin 23 of the holder 22.
  • a current flowing through the current band 13 thus causes forces which act to widen the loop, that is to say that strive to remove the legs 18 and 19 of the current band 13 from each other.
  • attractive forces occur between the current band 13 visible in FIG. 1 and a similar current band lying in front of or behind the current band 13 in the plane of the drawing. As a result, not only can these current strips come into an undesirable conductive connection with one another, but the thin metal sheets from which the current strips are made can also be subjected to high mechanical stress, particularly at their clamping points or connection points.
  • a deformation of this type is prevented by a spacer 31, which covers the loop area of the current band 13 with the legs 18 and 19.
  • the wall part 32 of the spacer 31 (FIGS. 2 and 3) lying between the current strips has a through opening 33 which is provided for the passage of the bearing bolt 23 of the carrier 22.
  • a corresponding oversize of the through opening 33 can ensure that inevitable manufacturing tolerances do not cause any difficulties during assembly and that there is a certain mobility of the spacer 31 relative to the holder 22.
  • the wall part 32 is adjoined on both sides by an approximately arcuate extension 34, which results in an approximately pocket-like configuration, as shown in particular in FIGS. 1 and 2.
  • the lugs 34 form a support surface 35 on their side facing the current strips, which acts as a flat support of the leg 18 of each current strip 13, as shown in FIG. 1. Subsequent to the contact surfaces 35, the shoulders 34 have a protective arch 36 which runs at such a distance from the associated current band 13 that the movement cannot be impeded.
  • the protective sheet 36 is dimensioned such that a sheet of the current strip 13, for example breaking at the point designated 37, is prevented from bending downward and is rather caught by the protective sheet 36 and completely enclosed. This prevents such a damaged sheet from coming into contact with live parts.
  • a current flowing through the current band 13 produces forces which tend to cause the legs 18 and 19 to spread. These forces can be deliberately used to compensate for contact-lifting forces caused by the same current between the contact pads 16 and 26 by being introduced in a suitable manner into the contact lever 14 acting as a two-armed lever.
  • the spacer 31 has a stop surface 38 which cooperates with a stationary counter surface 40 which is part of an angle 41 which is also gripped by the clamping screw 20. The force exerted by the leg 18 of the current band 13 on the support surface 35 is thus supported with respect to the insulating material carrier 10.
  • the spacer 31 shown as an individual part in FIGS. 2 and 3 is provided for contact arrangements with two parallel current paths per pole and, in addition to a wall part 32 separating the adjacent current bands, has two approaches 34 adjoining on both sides.
  • These spacers can also be used for contact arrangements with more than two parallel current paths; For example, for four parallel current paths, two identical spacers 31 according to FIGS. 2 and 3 can be used in connection with a modified spacer to be fitted between them, which essentially corresponds to the wall part 32 without the lugs 34.
  • Spacers can also be used for any number of parallel current paths, which correspond to FIGS. 2 and 3 with the difference that one of the two approaches 34 is omitted.
  • the insulating property of the spacer can be achieved by coating a metal part or by producing the spacer as a whole from an insulating plastic.

Description

Die Erfindung betrifft eine Kontaktanordnung für Niederspannungs-Leistungsschalter mit einem schwenkbar gelagerten Halter für einen beweglich angeordneten Schalthebel, der durch ein biegsames Stromband mit einer ortsfesten Anschlußstelle verbunden ist.The invention relates to a contact arrangement for low-voltage circuit breakers with a pivotably mounted holder for a movably arranged switching lever, which is connected to a fixed connection point by a flexible current band.

Eine Kontaktanordnung dieser Art ist beispielseise durch die DE-A-1 220 923 bekannt geworden. Hierbei ist bei einem mehrpoligen Leistungsschalter für jeden Pol ein Halter mit einem beweglichen Schalthebel und einem biegsamen Stromband vorhanden. Soll hiervon ausgehend ein Niederspannungs-Leistungsschalter für einen höheren Nennstrom geschaffen werden, so kann der übliche Weg beschritten werden, für jeden Pol statt eines einzigen zwei oder mehrere gleiche Kontakthebel mit zugehörigen Strombändern in einem gemeinsamen Halter vorzusehen. Auf diese räumlich parallel angeordneten und von parallelen Strömen durchflossenen Teile wirken Stromkräfte, die ohne schädliche Folgen bleiben, sofern ein ausreichender Abstand zwischen den Teilen besteht, da die Kräfte von dem Abstand abhängig sind. Soll aber der Abstand möglichst gering sein, wie dies beim Bau von raumsparenden und dennoch leistungsfähigen Schaltern gefordert wird, so ist mit erheblichen Kräften zu rechnen, die sich an den am leichtesten beweglichen Teilen am ehesten auswirken. Hierzu gehören insbesondere die biegsamen Strombänder, die gerade im Hinblick auf eine möglichst geringe Behinderung der Beweglichkeit der Kontakthebel möglichst flexibel ausgebildet werden.A contact arrangement of this type is known for example from DE-A-1 220 923. In the case of a multi-pole circuit breaker, there is a holder for each pole with a movable switching lever and a flexible current band. If a low-voltage circuit breaker for a higher rated current is to be created on this basis, the usual way can be to provide two or more identical contact levers with associated current strips in a common holder for each pole instead of a single one. Current forces, which remain without harmful consequences, act on these parts, which are arranged spatially in parallel and through which parallel currents flow, provided there is a sufficient distance between the parts, since the forces depend on the distance. However, if the distance is to be as small as possible, as is required in the construction of space-saving yet powerful switches, considerable forces are to be expected, which are most likely to affect the most easily moving parts. These include, in particular, the flexible current strips, which are designed to be as flexible as possible, particularly with a view to minimizing the impediment to the mobility of the contact levers.

Beispielsweise werden die Strombänder aus dünnen, hartgewalzten Kupferblechen geschichtet, die an ihren Enden durch Schweißen, Löten oder andere geeignete Verfahren verbunden sind. Da die Stromkräfte quer zu der Schichtung der Bleche wirken, können diese an ihren Befestigungsstellen deformiert werden oder reißen, was zu zunehmender Erwärmung und schließlich zur Beschädigung und zum Ausfall des Schalters führen kann.For example, the current strips are layered from thin, hard-rolled copper sheets, which are connected at their ends by welding, soldering or other suitable methods. Since the current forces act transversely to the stratification of the metal sheets, they can be deformed or torn at their fastening points, which can lead to increasing heating and ultimately to damage and failure of the switch.

Der Erfindung liegt hiervon ausgehend die Aufgabe zugrunde, ohne Einbuße an Beweglichkeit der Strombänder zwischen diesen einen möglichst geringen Abstand zu ermöglichen und damit zur Schaffung einer raumsparenden und leistungsfähigen Kontaktanordnung beizutragen.Proceeding from this, the object of the present invention is to enable the current bands to be as close as possible to one another without sacrificing mobility and thus to contribute to creating a space-saving and powerful contact arrangement.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß bei paralleler Anordnung von zwei oder mehreren Strombahnen je Pol zwischen den Strombändem ein an dem Halter abgestütztes isolierendes Distanzstück angeordnet ist. Dieses Distanzstück stützt die benachbarten Strombänder und verhindert dadurch eine zu starke Biegung unter dem Einfluß der anziehenden Kräfte, die bei hohen Strömen wirken. Infolge der Anbringung des Distanzstückes an dem Halter bleiben die Relativbewegungen zwischen den Strombändern und dem Distanzstück gering.According to the invention, this object is achieved in that an insulating spacer supported on the holder is arranged in a parallel arrangement of two or more current paths per pole between the current bands. This spacer supports the adjacent current strips and thus prevents excessive bending under the influence of the attractive forces that act at high currents. As a result of the attachment of the spacer to the holder, the relative movements between the current strips and the spacer remain small.

Aufwendige Mittel zur Anbringung des Distanzstückes werden nach einer Weiterbildung der Erfindung vermieden, in dem das Distanzstück mit einer Öffnung auf dem das Schwenklager des Halters bildenden Lagerbolzen beweglich gelagert ist. Zugleich kann das Distanzstück bei dieser Anbringung besonders geringe Abmessungen erhalten, was günstig für die Größe und das Gewicht des Distanzstückes ist.Elaborate means for attaching the spacer are avoided according to a development of the invention in which the spacer is movably mounted with an opening on the bearing pin forming the pivot bearing of the holder. At the same time, the spacer can have particularly small dimensions with this attachment, which is favorable for the size and the weight of the spacer.

Das Distanzstück kann ferner eine Auflagefläche für jedes Stromband und eine Anschlagfläche zur Begrenzung der Beweglichkeit des Distanzstückes gegenüber einem ortsfesten Gegenstück besitzen. Hierdurch wird erreicht, daß sich die Strombänder bei schleifenförmiger Ausführung unter dem Einfluß der Stromkräfte nicht ungehindert ausbiegen können, derart, daß die Stromkräfte nur an dem einen Schenkel jedes Strombandes wirksam werden. Dies kann dazu ausgenutzt werden, auf die Kontakthebel eine die kontaktabhebenden Kräfte kompensierende Kraft auszuüben. Über die Anschlagfläche stützt sich diese Kraft an dem Halter der Kontaktanordnung ab.The spacer can also have a contact surface for each current band and a stop surface to limit the mobility of the spacer relative to a stationary counterpart. It is thereby achieved that the current bands cannot bend freely under the influence of the current forces in a loop-shaped design, such that the current forces only act on one leg of each current band. This can be used to exert a force compensating the contact-lifting forces on the contact levers. This force is supported on the holder of the contact arrangement via the stop surface.

Ferner kann das Distanzstück durch einen sich an die Auflagefläche anschließenden Schutzbogen taschenartig ausgebildet sein, um einerseits die Strombänder zu schützen und andererseits einzelne Bleche der Strombänder aufzufangen, falls diese bei extremer Beanspruchung des Leistungsschalters gebrochen sein sollten. Auf diese Weise wird verhindert, daß sich die Bleche von dem Stromband weit abspreizen und mit geerdeten Teilen des' Leistungsschalters in Berührung gelangen.Furthermore, the spacer can be designed in a pocket-like manner by means of a protective arch adjoining the contact surface, on the one hand to protect the current strips and on the other hand to collect individual sheets of the current strips if these should be broken under extreme stress on the circuit breaker. This prevents the metal sheets from spreading far apart from the current band and coming into contact with earthed parts of the circuit breaker.

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

Die Figur 1 zeigt die Strombahn eines Poles eines Niederspannungs-Leistungsschalter teilweise im Schnitt.Figure 1 shows the current path of a pole of a low-voltage circuit breaker, partly in section.

Ein Distanzstück ist in Figur 2 als Einzelteil dargestellt.A spacer is shown in Figure 2 as a single part.

Die Figur 3 zeigt einen Schnitt A-B des Distanzstückes gemäß der Figur 2.FIG. 3 shows a section A-B of the spacer according to FIG. 2.

Die in der Figur 1 gezeigte Strombahn weist ein Isolierstoffteil 10 als Träger einer oberen gegabelten Anschlußschiene 11 und einer unteren, gleichfalls gegabelten Anschlußschiene 12 auf. Mit dieser steht ein biegsames Stromband 13 in leitender Verbindung, das die Stromzuführung zu einem geschnitten dargestellten Kontakthebel 14 bildet. Das Stromband 13 reicht bis zu einem Kontaktträger 15, an dem sich eine Kontaktauflage 16 befindet. Zur Herstellung einer Klemmverbindung zwischen der Anschlußschiene 12 und dem Stromband 13 enthält der Isolierstoffträger 10 eine eingepreßte Gewindebuchse 17, in die eine das Stromband 13 und die Anschlußschiene 12 durchsetzende Klemmschraube 20 eingeschraubt ist. Der Kontakthebel 14 ist um einen Gelenkbolzen 21 schwenkbar an einem Träger 22 gehalten, der seinerseits um einen Lagerbolzen 23 schwenbar ist. Durch einen Antriebshebel 24, der in nicht näher dargestellter Weise mit einer Antriebsvorrichtung in Verbindung steht, und der an einem den Träger 22 durchsetzenden Gelenkbolzen 25 angreift, wird der Träger 22 mit dem Kontakthebei 14 zum Ein- und Ausschalten geschwenkt. In der dargestellten Einschaltstellung liegt der Kontakthebei 14 mit seiner Kontaktauflage 16 an einer ortsfesten Kontaktauflage 26 an, die an einem gleichfalls durch eine Klemmschraube 27 an dem Isolierstoffträger 10 befestigten Kontaktträger 30 angebracht ist. Durch die Klemmschraube 27 wird der Kontaktträger mit der oberen Anschlußschiene 11 leitend verbunden.The current path shown in FIG. 1 has an insulating material part 10 as a carrier of an upper forked connecting rail 11 and a lower, likewise forked connecting rail 12. With this is a flexible current band 13 in conductive connection, which forms the power supply to a contact lever 14 shown in section. The current band 13 extends to a contact carrier 15, on which a contact pad 16 is located. To produce a clamp connection between the connecting bar 12 and the current strip 13, the insulating material carrier 10 contains a pressed-in threaded bushing 17, into which a clamping screw 20 passing through the current strip 13 and the connecting bar 12 is screwed. The contact lever 14 is pivotally held about a hinge pin 21 on a support 22, which in turn is pivotable about a bearing pin 23. By means of a drive lever 24, which is connected in a manner not shown to a drive device and which acts on a hinge pin 25 passing through the support 22, the support 22 is pivoted with the contact lever 14 for switching on and off. In the switch-on position shown, the contact lever 14 rests with its contact pad 16 on a stationary contact pad 26, which also rests on one is attached to the insulating carrier 10 by a clamping screw 27 attached contact carrier 30. The contact carrier is conductively connected to the upper connecting rail 11 by the clamping screw 27.

Wie die Figur 1 zeigt, ist das Strombad 13 in seinem unteren Bereich schleifenförmig ausbildet und umschließt dabei den Lagerbolzen 23 des Halters 22. Ein das Stromband 13 durchfließender Strom ruft somit Kräfte hervor, die im Sinne einer Aufweitung der Schleife wirken, das heißt, die bestrebt sind, die Schenkel 18 und 19 des Strombandes 13 voneinander zu entfernen. Ferner treten anziehende Kräfte zwischen dem in der Figur 1 sichtbaren Stromband 13 und einem gleichen, in der Zeichenebene vor oder hinter dem Stromband 13 liegenden weiteren Stromband auf. Hierdurch können nicht nur diese Strombänder in eine unerwünschte leitende Verbindung miteinander gelangen, sondern es können auch die dünnen Bleche, aus denen die Strombänder bestehen, besonders an ihren Einspannstellen bzw. Verbindungsstellen mechanisch stark beansprucht werden.As shown in FIG. 1, the current bath 13 is loop-shaped in its lower region and thereby surrounds the bearing pin 23 of the holder 22. A current flowing through the current band 13 thus causes forces which act to widen the loop, that is to say that strive to remove the legs 18 and 19 of the current band 13 from each other. In addition, attractive forces occur between the current band 13 visible in FIG. 1 and a similar current band lying in front of or behind the current band 13 in the plane of the drawing. As a result, not only can these current strips come into an undesirable conductive connection with one another, but the thin metal sheets from which the current strips are made can also be subjected to high mechanical stress, particularly at their clamping points or connection points.

Eine Verformung dieser Art wird durch ein Distanzstück 31 verhindert, das den Schleifenbereich des Strombandes 13 mit den Schenkeln 18 und 19 überdeckt. Der zwischen den Strombändern liegende Wandungsteil 32 des Distanzstückes 31 (Figuren 2 und 3) besitzt eine Durchgangsöffnung 33, die für den Durchtritt des Lagerbolzens 23 des Trägers 22 vorgesehen ist. Durch ein entsprechendes Übermaß der Durchgangsöffnung 33 kann dafür gesorgt sein, daß unvermeidliche Herstellungstoleranzen keine Schwierigkeiten bei der Montage hervorrufen und daß eine gewisse Beweglichkeit des Distanzhalters 31 gegenüber dem Halter 22 besteht. An das Wandungsteil 32 schließt sich nach beiden Seiten ein etwa bogenförmiger Ansatz 34 an, wodurch eine etwa taschenartige Gestaltung entsteht, wie insbesondere die Figuren 1 und 2 zeigen. Die Ansätze 34 bilden an ihrer den Strombändern zugewandten Seite eine Auflagefläche 35, die als flächenhafte Abstützung des Schenkels 18 jedes Strombandes 13 wirkt, wie die Figur 1 zeigt. Anschließend an die Auflageflächen 35 weisen die Ansätze 34 einen Schutzbogen 36 auf, der in einem solchen Abstand zu dem zugehörigen Stromband 13 verläuft, daß eine Behinderung der Bewegung nicht auftreten kann. Der Schutzbogen 36 ist derart bemessen, daß ein beispielsweise an der mit 37 bezeichneten Stelle brechendes Blech des Strombandes 13 an der Biegung nach unten gehindert und vielmehr von dem Schutzbogen 36 aufgefangen und vollständig umschlossen wird. Damit ist eine Berührung eines solchen beschädigten Bleches mit spannungführenden Teilen verhindert.A deformation of this type is prevented by a spacer 31, which covers the loop area of the current band 13 with the legs 18 and 19. The wall part 32 of the spacer 31 (FIGS. 2 and 3) lying between the current strips has a through opening 33 which is provided for the passage of the bearing bolt 23 of the carrier 22. A corresponding oversize of the through opening 33 can ensure that inevitable manufacturing tolerances do not cause any difficulties during assembly and that there is a certain mobility of the spacer 31 relative to the holder 22. The wall part 32 is adjoined on both sides by an approximately arcuate extension 34, which results in an approximately pocket-like configuration, as shown in particular in FIGS. 1 and 2. The lugs 34 form a support surface 35 on their side facing the current strips, which acts as a flat support of the leg 18 of each current strip 13, as shown in FIG. 1. Subsequent to the contact surfaces 35, the shoulders 34 have a protective arch 36 which runs at such a distance from the associated current band 13 that the movement cannot be impeded. The protective sheet 36 is dimensioned such that a sheet of the current strip 13, for example breaking at the point designated 37, is prevented from bending downward and is rather caught by the protective sheet 36 and completely enclosed. This prevents such a damaged sheet from coming into contact with live parts.

Wie bereits erwähnt, ruft ein durch das Stromband 13 fließender Strom Kräfte hervor, die eine Spreizung der Schenkel 18 und 19 hervorzurufen bestrebt ist. Diese Kräfte können bewußt ausgenutzt werden, um durch denselben Strom hervorgerufene kontaktabhebende Kräfte zwischen den Kontaktauflagen 16 und 26 zu kompensieren, indem sie in geeigneter Weise in den als zweiarmigen Hebel wirkenden Kontakthebel 14 eingeleitet werden. Hierzu besitzt das Distanzstück 31 eine Anschlagfläche 38, die mit einer ortsfesten Gegenfläche 40 zusammenwirkt, die Bestandteil eines gleichfalls von der Klemmschraube 20 erfaßten Winkels 41 ist. Von dem Schenkel 18 des Strombandes 13 auf die Auflagefläche 35 ausgeübte Kraft wird somit gegenüber dem Isolierstoffträger 10 abgestützt. Infolgedessen wirkt sich die in der Stromschleife auftretende Kraft vollständig auf den Schenkel 19 des Strombandes 13 aus, der seinerseits an einer passend geformten Wandung 42 des Kontakthebels 14 anliegt. Hierdurch entsteht ein Drehmoment um den Gelenkbolzen 21, das in demselben Sinn wie eine zwischen dem Isolierstoffträger 10 und dem Kontakthebei 14 angeordnete Druckfeder 43 wirkt.As already mentioned, a current flowing through the current band 13 produces forces which tend to cause the legs 18 and 19 to spread. These forces can be deliberately used to compensate for contact-lifting forces caused by the same current between the contact pads 16 and 26 by being introduced in a suitable manner into the contact lever 14 acting as a two-armed lever. For this purpose, the spacer 31 has a stop surface 38 which cooperates with a stationary counter surface 40 which is part of an angle 41 which is also gripped by the clamping screw 20. The force exerted by the leg 18 of the current band 13 on the support surface 35 is thus supported with respect to the insulating material carrier 10. As a result, the force occurring in the current loop has a complete effect on the leg 19 of the current band 13, which in turn bears against a suitably shaped wall 42 of the contact lever 14. This creates a torque around the hinge pin 21, which acts in the same sense as a compression spring 43 arranged between the insulating material carrier 10 and the contact lever 14.

Das in den Figuren 2 und 3 als Einzelteil gezeigte Distanzstück 31 ist für Kontaktanordnungen mit zwei parallelen Strombahnen je Pol vorgesehen und weist hierzu neben einer die benachbarten Strombänder trennenden Wandungsteil 32 zwei beidseitig anschließende Ansätze 34 auf. Diese Distanzstücke sind sinngemäß auch für Kontaktanordnungen mit mehr als zwei parallelen Strombahnen einsetzbar; beispielsweise können für vier parallele Strombahnen zwei gleiche Distanzstücke 31 gemäß den Figuren 2 und 3 in Verbindung mit einem dazwischen anzubringenden abgewandelten Distanzstück benutzt werden, das im wesentlichen dem Wandungsteil 32 ohne die Ansätze 34 entspricht. Für eine beliebige Anzahl paralleler Strombahnen sind auch Distanzstücke einsetzbar, die den Figuren 2 und 3 mit dem Unterschied entsprechen, daß einer der beiden Ansätze 34 fortgelassen ist. Die isolierende Eigenschaft des Distanzstückes kann durch Beschichtung eines Metallteiles oder durch Herstellung des Distanzstückes als Ganzes aus einem isolierenden Kunststoff erreicht werden.The spacer 31 shown as an individual part in FIGS. 2 and 3 is provided for contact arrangements with two parallel current paths per pole and, in addition to a wall part 32 separating the adjacent current bands, has two approaches 34 adjoining on both sides. These spacers can also be used for contact arrangements with more than two parallel current paths; For example, for four parallel current paths, two identical spacers 31 according to FIGS. 2 and 3 can be used in connection with a modified spacer to be fitted between them, which essentially corresponds to the wall part 32 without the lugs 34. Spacers can also be used for any number of parallel current paths, which correspond to FIGS. 2 and 3 with the difference that one of the two approaches 34 is omitted. The insulating property of the spacer can be achieved by coating a metal part or by producing the spacer as a whole from an insulating plastic.

Claims (4)

1. Contact arrangement (1) for low voltage circuit- breakers having a swivel-mounted holder (22) for a movably arranged switch lever (14) which is connected with a fixed connection point (connection rail 12) by means of a flexible current conductor (13), characterised in that in the case of a parallel arrangement of two or several current paths per pole, between the current conductors (13) there is arranged an insulating spacer piece (31) which is supported on the holder (22).
2. Contact arrangement according to claim 1, characterised in that the spacer piece (31) is mounted in a moveable manner with an opening (33) on a bearing bolt (23) which forms the swivel bearing of the holder (22).
3. Contact arrangement according to claim 1, characterised in that the spacer piece (31) for looped current conductors (13) has a supporting surface (35) for one side (18) of the loop of the current conductor (13) and a stop face (38) for limiting the mobility of the spacer piece (31) in relation to a fixed counter-piece (41).
4. Contact arrangement according to claim 3, characterised in that the spacer piece (31) has, connected to the supporting surface (35), a protective arch (36) for the current conductor (13).
EP86730133A 1985-10-07 1986-09-05 Contact arrangement for a low-voltage circuit breaker with a flexible current conductor Expired EP0219449B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3536112 1985-10-07
DE19853536112 DE3536112A1 (en) 1985-10-07 1985-10-07 CONTACT ARRANGEMENT FOR LOW VOLTAGE CIRCUIT BREAKERS WITH A BENDING ELECTRIC STRIP

Publications (2)

Publication Number Publication Date
EP0219449A1 EP0219449A1 (en) 1987-04-22
EP0219449B1 true EP0219449B1 (en) 1989-06-21

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ID=6283219

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Application Number Title Priority Date Filing Date
EP86730133A Expired EP0219449B1 (en) 1985-10-07 1986-09-05 Contact arrangement for a low-voltage circuit breaker with a flexible current conductor

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US (1) US4727345A (en)
EP (1) EP0219449B1 (en)
JP (1) JPS6288222A (en)
DE (2) DE3536112A1 (en)

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JPH0452319U (en) * 1990-09-07 1992-05-01
DE19643607A1 (en) * 1996-05-13 1997-11-20 Siemens Ag LV power switch with contact system and connection rails
DE19715115C2 (en) * 1997-04-11 2001-07-19 Aeg Niederspannungstech Gmbh Switching device
DE19930813A1 (en) * 1999-06-30 2001-01-04 Siemens Ag Circuit breakers with connecting rails for different nominal currents
IT1314039B1 (en) 1999-10-08 2002-12-03 Abb Ricerca Spa ELECTRIC POLE FOR LOW VOLTAGE POWER SWITCH.
DE20106248U1 (en) * 2001-04-04 2002-08-08 Siemens Ag Connection rail for low-voltage circuit breakers
JP4395134B2 (en) * 2004-01-28 2010-01-06 三菱電機株式会社 Breaker
DE102004020654A1 (en) * 2004-04-22 2005-11-10 Siemens Ag Switching contact arrangement
WO2012017282A1 (en) * 2010-07-31 2012-02-09 Larsen & Toubro Limited An improved contact arrangement for high fault current withstand in a low voltage switching device
CN103065821A (en) * 2012-12-28 2013-04-24 常熟开关制造有限公司(原常熟开关厂） Contact terminal mechanism of automatic change-over switch
US9184013B2 (en) * 2013-06-21 2015-11-10 General Electric Company Conductor guide member for a circuit breaker terminal assembly
KR101884327B1 (en) * 2016-09-22 2018-08-02 계양전기 주식회사 Accessory for electric tool
CN106971867B (en) * 2017-05-24 2019-12-31 首瑞（天津）电气设备有限公司 Moving contact and circuit breaker

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Also Published As

Publication number Publication date
JPS6288222A (en) 1987-04-22
DE3536112A1 (en) 1987-04-09
US4727345A (en) 1988-02-23
JPH0353729B2 (en) 1991-08-16
DE3664075D1 (en) 1989-07-27
EP0219449A1 (en) 1987-04-22

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