EP0358289B1 - Moving contact arrangement with a shielding part - Google Patents

Moving contact arrangement with a shielding part Download PDF

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Publication number
EP0358289B1
EP0358289B1 EP89250029A EP89250029A EP0358289B1 EP 0358289 B1 EP0358289 B1 EP 0358289B1 EP 89250029 A EP89250029 A EP 89250029A EP 89250029 A EP89250029 A EP 89250029A EP 0358289 B1 EP0358289 B1 EP 0358289B1
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EP
European Patent Office
Prior art keywords
contact
partitions
levers
shielding part
contact arrangement
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
EP89250029A
Other languages
German (de)
French (fr)
Other versions
EP0358289A2 (en
EP0358289A3 (en
Inventor
Clifford A. Buxton
David A. Leone
Don Quinton
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of EP0358289A2 publication Critical patent/EP0358289A2/en
Publication of EP0358289A3 publication Critical patent/EP0358289A3/en
Application granted granted Critical
Publication of EP0358289B1 publication Critical patent/EP0358289B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H1/12—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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/62—Heating or cooling of contacts
    • 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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/302—Means for extinguishing or preventing arc between current-carrying parts wherein arc-extinguishing gas is evolved from stationary parts

Definitions

  • the invention relates to a movable contact arrangement for a low-voltage circuit breaker with a plurality of contact levers arranged in parallel, which can be pivoted about an articulation, and with movable contact pieces attached to the latter, which interact with stationary contact pieces, and with an insulating partition for the shielding body having the contact lever.
  • a contact arrangement of this type is known from US-A-4,672,157.
  • the purpose of arranging a plurality of contact levers in parallel is to distribute high currents over a number of contact transition points.
  • the partitions of the shielding body help to ensure the uniform distribution of the total current despite the small distance between the adjacent contact levers.
  • the object of the invention is to increase the resilience of such a contact arrangement by means of improved cooling. Furthermore, the dwell of switching arcs on the contacts should be restricted as far as possible in order to counteract wear of the contacts and thus an increase in the contact resistance.
  • a receiving area delimited by wall parts can also be provided for the engagement of a drive device serving to pivot the contact lever. This arrangement permits the coupling of the drive device while largely maintaining the gaps between the contact levers created for cooling.
  • the shielding body may have alternatingly continuous partition walls and partition walls provided with projections and for at least two of the partition walls provided with projections additionally to have a receiving area.
  • one side surface of each contact lever is adjacent to one of the gaps created.
  • the shielding body On its side covering the underside of the contact levers, the shielding body can have an angled gas-emitting protective web and an additional transverse web extending at a distance from the underside of the contact levers, directly after the movable contact pieces. Gases are released from the protective web when heated by the arcs that occur on the contact pieces during switching. The gas formation causes the arcs to be driven away by the contacts and the contact pieces are therefore only exposed to the arc for a short time. This helps to reduce the wear of the contact pieces and to keep the contact resistance between the contact pieces low. As a result, the heating of the entire contact arrangement is less during operation. Characterized in that there is a transverse web arranged at a distance from the underside of the contact lever on the protective web of the shielding body, the entry of the air into the spaces between the contact levers is facilitated. This improves the cooling effect.
  • FIG. 1 is a side view of a contact arrangement with a plurality of contact levers arranged in parallel and with a shielding body.
  • FIG. 2 shows a top view of the contact arrangement according to FIG. 1.
  • Figures 3 and 4 show a shielding body in a plan view and in a side view.
  • the contact arrangement shown in FIG. 1 and designated as a whole by 2 is part of a circuit breaker, for example a low-voltage circuit breaker of compact design with a molded-plastic housing (MCCB).
  • the contact arrangement 2 is opened and closed by touching and separating contact pieces 10 and 12, of which several pairs are provided, in order to limit the stress on each individual pair of contact pieces 10 and 12 to a certain extent.
  • the contact arrangement 2 comprises a current-transmitting joint arrangement 16 with a pivot axis 4 and a number of contact levers 18, each of which is provided with a contact piece 10.
  • the contact pieces 10 can be brought into contact with the fixed contact pieces 12, which are attached to a further fixed connecting rail 6, by pivoting the contact lever 18 about the pivot axis 4 in the clockwise direction.
  • the parallel arrangement of the contact levers 18 can be seen in FIG. 2.
  • the shielding body 20 is a molded plastic part with partitions 26 and 28.
  • the partitions 26 are flat, so that the contact lever 18 abut them directly.
  • the partition walls 28, on the other hand, are provided with projections 22 in such a way that spaces 30 are created between the adjacent contact levers 18 and the partition wall 28 located therebetween, through which air can flow.
  • Two of the partitions 28 also have receiving areas 24 delimited by wall parts, which are provided for the engagement of drive parts of a drive device in order to pivot the contact levers 18 for switching on and off.
  • the side view of the shielding body 20 can be seen that on the underside of the shielding body 20 there is a transverse web 32, which extends over all the contact levers 18 and extends at a distance from the underside of the contact lever 18, and another, the contact pieces 12 adjacent gas-emitting protective web 34 is provided.
  • the protective web 32 abuts in part on the underside 36 of the contact lever 18 and supports it in such a way that it is moved evenly when pivoted.
  • the space between the underside of the contact lever 18 and the crosspiece 32 which can be seen in particular in FIG. 1, facilitates the access of the air into the spaces 30 and thus improves the cooling of the contact arrangement 2.
  • the gas-emitting protective web 34 prevents an arc from running along the lower edge 36 of the contact lever. Furthermore, the emission of gases from the plastic of the shielding body 20 under the influence of arcs at the contacts 10 and 12 causes the arc to be rapidly moved away from the contacts 10 and 12 in the direction of an arcing horn and an arc quenching chamber located upstream thereof.
  • the shielding body 20 can consist of an insulating, heat-resistant and gas-releasing gas under the influence of arcs Material. Such a material is appropriate to ensure the desired strength of the shielding body 20 and also to cause the gas to be emitted when there is strong heating by an arc.
  • the shielding body can be designed so that it can be used with a different number of contact levers.
  • the receiving areas could be given an adapted shape depending on the drive device provided.
  • the spaces provided for the passage of air can be dimensioned in accordance with the desired cooling effect.
  • the crossbar 32 can also be provided with incisions to facilitate air access.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Push-Button Switches (AREA)

Description

Die Erfindung betrifft eine bewegbare Kontaktanordnung für einen Niederspannungs-Leistungsschalter mit mehreren parallel angeordneten, um ein Gelenk schwenbaren Kontakthebeln und an diesen angebrachten bewegbaren Kontaktstücken, die mit ortsfesten Kontaktstücken zusammenwirken, sowie mit einem isolierende Trennwände für die Kontakthebel aufweisenden Abschirmkörper.The invention relates to a movable contact arrangement for a low-voltage circuit breaker with a plurality of contact levers arranged in parallel, which can be pivoted about an articulation, and with movable contact pieces attached to the latter, which interact with stationary contact pieces, and with an insulating partition for the shielding body having the contact lever.

Eine Kontaktanordnung dieser Art ist durch die US-A-4 672 157 bekannt geworden. Zweck der parallelen Anordnung mehrerer Kontakthebel ist es, hohe Ströme auf mehrere Kontaktübergangsstellen zu verteilen. Die Trennwände des Abschirmkörpers tragen dazu bei, trotz geringen Abstandes der benachbarten Kontakthebel die gleichmäßige Aufteilung des Gesamtstromes zu gewährleisten.A contact arrangement of this type is known from US-A-4,672,157. The purpose of arranging a plurality of contact levers in parallel is to distribute high currents over a number of contact transition points. The partitions of the shielding body help to ensure the uniform distribution of the total current despite the small distance between the adjacent contact levers.

Der Erfindung liegt hiervon ausgehend die Aufgabe zugrunde, die Belastbarkeit einer solchen Kontaktanordnung durch eine verbesserte Kühlung zu steigern. Ferner soll das Verweilen von Schaltlichtbögen an den Kontakten soweit wie möglich beschränkt werden, um einer Abnutzung der Kontakte und damit einer Erhöhung des Übergangswiderstandes entgegenzuwirken.Proceeding from this, the object of the invention is to increase the resilience of such a contact arrangement by means of improved cooling. Furthermore, the dwell of switching arcs on the contacts should be restricted as far as possible in order to counteract wear of the contacts and thus an increase in the contact resistance.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß wenigstens ein Teil der Trennwände beidseitig mit Vorsprüngen zur örtlichen Abstützung benachbarter Kontakthebel gegeneinander unter Freilassung von Zwischenräumen versehen ist. Hierdurch wird erreicht, daß zwischen den sich im Betrieb beträchtlich erwärmenden Kontakthebeln ständig Luft hindurchströmen und die Kontakthebel kühlen kann.This object is achieved according to the invention in that at least some of the partitions are provided on both sides with projections for local support of adjacent contact levers against one another, leaving gaps. This ensures that air can flow continuously between the contact levers, which heat up considerably during operation, and cool the contact levers.

An einem Teil der Trennwände des Abschirmkörpers kann ferner jeweils ein von Wandteilen begrenzter Aufnahmebereich für den Eingriff einer zum Schwenken der Kontakthebel dienenden Antriebsvorrichtung vorgesehen sein. Diese Anordnung gestattet die Ankopplung der Antriebsvorrichtung bei weitgehender Aufrechterhaltung der für die Kühlung geschaffenen Zwischenräume zwischen den Kontakthebeln.On a part of the partition walls of the shielding body, a receiving area delimited by wall parts can also be provided for the engagement of a drive device serving to pivot the contact lever. This arrangement permits the coupling of the drive device while largely maintaining the gaps between the contact levers created for cooling.

In Abhängigkeit von der vorgesehenen Belastbarkeit der Kontaktanordnung kann es ausreichend sein, daß der Abschirmkörper abwechselnd durchgehend ebene Trennwände und mit Vorsprüngen versehene Trennwände aufweist und daß wenigstens zwei der mit Vorsprüngen versehenen Trennwände zusätzlich je einen Aufnahmebereich besitzen. Bei dieser Anordnung grenzt jeweils eine Seitenfläche jedes Kontakthebels an einen der geschaffenen Zwischenräume an.Depending on the intended load capacity of the contact arrangement, it may be sufficient for the shielding body to have alternatingly continuous partition walls and partition walls provided with projections and for at least two of the partition walls provided with projections additionally to have a receiving area. In this arrangement, one side surface of each contact lever is adjacent to one of the gaps created.

Der Abschirmkörper kann an seiner die Unterseite der Kontakthebel bedeckenden Seite unmittelbar an die bewegbaren Kontaktstücke anschließend einen abgewinkelten gasabgebenden Schutzsteg und einen weiteren, sich in einem Abstand von der Unterseite der Kontakthebel erstreckenden Quersteg aufweisen. Aus dem Schutzsteg werden Gase bei einer Erhitzung durch die an den Kontaktstücken beim Schalten auftretenden Lichtbögen freigegeben. Die Gasbildung bewirkt, daß die Lichtbögen von den Kontakten fortgetrieben werden und damit die Kontaktstücke dem Lichtbogen nur kurze Zeit ausgesetzt sind. Dies trägt dazu bei, die Abnutzung der Kontaktstücke zu verringern und den Übergangswiderstand zwischen den Kontaktstücken gering zu halten. Infolgedessen ist auch die Erwärmung der gesamten Kontaktanordnung im Betrieb geringer. Dadurch, daß anschließend an den Schutzsteg des Abschirmkörpers ein im Abstand von der Unterseite der Kontakthebel angeordneter Quersteg vorhanden ist, wird der Eintritt der Luft in die Zwischenräume zwischen den Kontakthebeln erleichtert. Hierdurch wird die Kühlwirkung noch verbessert.On its side covering the underside of the contact levers, the shielding body can have an angled gas-emitting protective web and an additional transverse web extending at a distance from the underside of the contact levers, directly after the movable contact pieces. Gases are released from the protective web when heated by the arcs that occur on the contact pieces during switching. The gas formation causes the arcs to be driven away by the contacts and the contact pieces are therefore only exposed to the arc for a short time. This helps to reduce the wear of the contact pieces and to keep the contact resistance between the contact pieces low. As a result, the heating of the entire contact arrangement is less during operation. Characterized in that there is a transverse web arranged at a distance from the underside of the contact lever on the protective web of the shielding body, the entry of the air into the spaces between the contact levers is facilitated. This improves the cooling effect.

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 ist eine Seitenansicht einer Kontaktanordnung mit mehreren parallel angeordneten Kontakthebeln und mit einem Abschirmkörper.FIG. 1 is a side view of a contact arrangement with a plurality of contact levers arranged in parallel and with a shielding body.

In der Figur 2 ist eine Draufsicht der Kontaktanordnung gemäß der Figur 1 gezeigt.FIG. 2 shows a top view of the contact arrangement according to FIG. 1.

Die Figuren 3 und 4 zeigen einen Abschirmkörper in einer Draufsicht bzw. in einer Seitenansicht.Figures 3 and 4 show a shielding body in a plan view and in a side view.

Die in der Figur 1 gezeigte und als Ganzes mit 2 bezeichnete Kontaktanordnung ist Bestandteil eines Leistungsschalters, beispielsweise eines Niederspannungs-Leistungsschalters kompakter Bauart mit Formstoffgehäuse (MCCB). Die Öffnung und Schließung der Kontaktanordnung 2 geschieht durch Berührung und Trennung von Kontaktstücken 10 und 12, von denen mehrere Paare vorgesehen sind, um die Beanspruchung jedes einzelnen Paares von Kontaktstücken 10 und 12 auf ein bestimmtes Maß zu begrenzen. Ausgehend von einer feststehenden Anschlußschiene 14 umfaßt die Kontaktanordnung 2 eine stromübertragende Gelenkanordnung 16 mit einer Schwenkachse 4 sowie eine Anzahl von Kontakthebeln 18, die jeweils mit einem Kontaktstück 10 versehen sind. Ausgehend von der Stellung der Teile gemäß der Figur 1 lassen sich die Kontaktstücke 10 durch Schwenkung der Kontakthebel 18 um die Schwenkachse 4 im Uhrzeigersinn mit den feststehenden Kontaktstücken 12 in Berührung bringen, die an einer weiteren ortsfesten Anschlußschiene 6 angebracht sind.The contact arrangement shown in FIG. 1 and designated as a whole by 2 is part of a circuit breaker, for example a low-voltage circuit breaker of compact design with a molded-plastic housing (MCCB). The contact arrangement 2 is opened and closed by touching and separating contact pieces 10 and 12, of which several pairs are provided, in order to limit the stress on each individual pair of contact pieces 10 and 12 to a certain extent. Starting from a fixed connecting rail 14, the contact arrangement 2 comprises a current-transmitting joint arrangement 16 with a pivot axis 4 and a number of contact levers 18, each of which is provided with a contact piece 10. Starting from the position of the parts according to FIG. 1, the contact pieces 10 can be brought into contact with the fixed contact pieces 12, which are attached to a further fixed connecting rail 6, by pivoting the contact lever 18 about the pivot axis 4 in the clockwise direction.

Die parallele Anordnung der Kontakthebel 18 ist der Figur 2 zu entnehmen. Insgesamt sind in dem dargestellten Beispiel zehn Kontakthebel 18 vorhanden, die durch einen mit dem Kontakthebeln 18 verbundenen Abschirmkörper 20 in gegenseitigem Abstand gehalten werden. Der Abschirmkörper 20 ist ein Kunststoff-Formteil mit Trennwänden 26 und 28. Hierbei sind die Trennwände 26 eben ausgebildet, so daß die Kontakthebel 18 an ihnen unmittelbar anliegen. Die Trennwände 28 sind dagegen mit Vorsprüngen 22 versehen, derart, daß zwischen den angrenzenden Kontakthebeln 18 und der dazwischen befindlichen Trennwand 28 Zwischenräume 30 geschaffen werden, die von Luft durchströmt werden können.The parallel arrangement of the contact levers 18 can be seen in FIG. 2. In total, there are ten contact levers 18 in the example shown, which are held at a mutual distance by a shielding body 20 connected to the contact levers 18. The shielding body 20 is a molded plastic part with partitions 26 and 28. Here, the partitions 26 are flat, so that the contact lever 18 abut them directly. The partition walls 28, on the other hand, are provided with projections 22 in such a way that spaces 30 are created between the adjacent contact levers 18 and the partition wall 28 located therebetween, through which air can flow.

Zwei der Trennwände 28 weisen darüber hinaus von Wandteilen begrenzte Aufnahmebereiche 24 auf, die für den Eingriff von Antriebsteilen einer Antriebsvorrichtung vorgesehen sind, um die Kontakthebel 18 zum Ein- und Ausschalten zu schwenken.Two of the partitions 28 also have receiving areas 24 delimited by wall parts, which are provided for the engagement of drive parts of a drive device in order to pivot the contact levers 18 for switching on and off.

Anhand der den Figuren 1 und 4 zu entnehmenden Seitenansicht des Abschirmkörpers 20 ist zu erkennen, daß an der Unterseite des Abschirmkörpers 20 ein sich über alle Kontakthebel 18 erstreckender, mit einem Abstand von der Unterseite der Kontakthebel 18 erstreckender Quersteg 32 und ein weiterer, den Kontaktstücken 12 benachbarter gasabgebender Schutzsteg 34 vorgesehen ist. Der Schutzsteg 32 liegt zum Teil an der Unterseite 36 der Kontakthebel 18 an und stützt diese derart, daß sie beim Schwenken gleichmäßig bewegt werden. Durch den insbesondere in der Figur 1 ersichtlichen Zwischenraum zwischen der Unterseite der Kontakthebel 18 und dem Quersteg 32 wird der Zutritt der Luft in die Zwischenräume 30 erleichtert und damit die Kühlung der Kontaktanordnung 2 verbessert. Der gasabgebende Schutzsteg 34 verhindert, daß ein Lichtbogen entlang der Unterkante 36 der Kontakthebel laufen kann. Ferner bewirkt die Abgabe von Gasen aus dem Kunststoff des Abschirmkörpers 20 unter dem Einfluß von Lichtbögen an den Kontakten 10 und 12, daß der Lichtbogen rasch von den Kontakten 10 und 12 in Richtung eines Lichtbogenhornes und einer diesem vorgelagerten Lichtbogenlöschkammer fortbewegt wird.On the basis of FIGS. 1 and 4, the side view of the shielding body 20 can be seen that on the underside of the shielding body 20 there is a transverse web 32, which extends over all the contact levers 18 and extends at a distance from the underside of the contact lever 18, and another, the contact pieces 12 adjacent gas-emitting protective web 34 is provided. The protective web 32 abuts in part on the underside 36 of the contact lever 18 and supports it in such a way that it is moved evenly when pivoted. The space between the underside of the contact lever 18 and the crosspiece 32, which can be seen in particular in FIG. 1, facilitates the access of the air into the spaces 30 and thus improves the cooling of the contact arrangement 2. The gas-emitting protective web 34 prevents an arc from running along the lower edge 36 of the contact lever. Furthermore, the emission of gases from the plastic of the shielding body 20 under the influence of arcs at the contacts 10 and 12 causes the arc to be rapidly moved away from the contacts 10 and 12 in the direction of an arcing horn and an arc quenching chamber located upstream thereof.

Der Abschirmkörper 20 kann aus einem isolierenden, wärmebeständigen und unter dem Einfluß von Lichtbögen gasabgebenden Material hergestellt sein. Ein solcher Werkstoff ist angemessen, um die gewünschte Festigkeit des Abschirmkörpers 20 sicherzustellen und auch die Gasabgabe zu bewirken, wenn eine starke Erhitzung durch einen Lichtbogen auftritt.The shielding body 20 can consist of an insulating, heat-resistant and gas-releasing gas under the influence of arcs Material. Such a material is appropriate to ensure the desired strength of the shielding body 20 and also to cause the gas to be emitted when there is strong heating by an arc.

Die dargestellte Anordnung kann vielfältig abgewandelt werden, ohne von dem Erfindungsgedanken abzuweichen. Beispielsweise kann der Abschirmkörper so ausgebildet sein, daß er mit einer unterschiedlichen Anzahl von Kontakthebeln verwendbar ist. zusätzlich könnten die Aufnahmebereiche in Abhängigkeit von der vorgesehenen Antriebsvorrichtung eine angepaßte Gestalt erhalten. Die zum Durchtritt der Luft vorgesehenen Zwischenräume können entsprechend der gewünschten Kühlwirkung bemessen sein. Auch kann der Quersteg 32 mit Einschnitten zur Erleichterung des Luftzutrittes versehen sein.The arrangement shown can be modified in many ways without deviating from the inventive concept. For example, the shielding body can be designed so that it can be used with a different number of contact levers. in addition, the receiving areas could be given an adapted shape depending on the drive device provided. The spaces provided for the passage of air can be dimensioned in accordance with the desired cooling effect. The crossbar 32 can also be provided with incisions to facilitate air access.

Claims (4)

  1. A moving contact arrangement (2) for a low-voltage power switch with several contact levers (18) disposed in parallel and pivotable about a link (4) and moving contact makers (10) mounted thereon, which cooperate with fixed contact pieces (12), and with a shielding part (20) which comprises isolating partitions (26, 28) for the contact levers (18) characterized in that at least one part of the partitions (26, 28) is provided on both sides with projections (22), which create interim spaces (30), for the localized support of adjacent contact levers (18) against one another.
  2. A contact arrangement according to claim 1 characterized in that each of at least one part of the partitions (28) has an input area (24) bordered by wall parts to engage a power device for the pivoting of the contact levers (18).
  3. A contact arrangement according to claim 2 characterized in that the shielding part (20) comprises flat partitions (26) and partitions (28) provided with projections (22) which alternate throughout and in that each of the at least two partitions (28) provided with projections (22) has, in addition, an input area (24).
  4. A contact arrangement according to one of the preceding claims characterized in that the shielding part (20) comprises an angled, gas-yielding protection piece (34) directly adjacent to the moving contact makers (10) on its side which covers the underside (36) of the contact levers (18) and a further cross-piece (32) extending at a distance from the underside (36) of the contact levers (18).
EP89250029A 1988-09-08 1989-09-07 Moving contact arrangement with a shielding part Expired - Lifetime EP0358289B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/242,092 US4926016A (en) 1988-09-08 1988-09-08 Moving contact blade barrier
US242092 1988-09-08

Publications (3)

Publication Number Publication Date
EP0358289A2 EP0358289A2 (en) 1990-03-14
EP0358289A3 EP0358289A3 (en) 1991-05-15
EP0358289B1 true EP0358289B1 (en) 1994-11-23

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EP89250029A Expired - Lifetime EP0358289B1 (en) 1988-09-08 1989-09-07 Moving contact arrangement with a shielding part

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US (1) US4926016A (en)
EP (1) EP0358289B1 (en)
JP (1) JPH02117025A (en)
CA (1) CA1330817C (en)
DE (1) DE58908658D1 (en)
ES (1) ES2064428T3 (en)

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EP2674953B1 (en) 2012-06-11 2018-01-24 ABB Oy Electric current switching apparatus
EP2674952B1 (en) 2012-06-11 2018-10-10 ABB Oy Electric current switching apparatus
KR101879338B1 (en) * 2016-12-05 2018-07-17 엘에스산전 주식회사 Air circuit breaker

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ES2064428T3 (en) 1995-02-01
EP0358289A2 (en) 1990-03-14
US4926016A (en) 1990-05-15
DE58908658D1 (en) 1995-01-05
JPH02117025A (en) 1990-05-01
CA1330817C (en) 1994-07-19
EP0358289A3 (en) 1991-05-15

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