EP0402357B1 - Contact arrangement with electric arcing horn and electric arc conductor - Google Patents

Contact arrangement with electric arcing horn and electric arc conductor Download PDF

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Publication number
EP0402357B1
EP0402357B1 EP88909978A EP88909978A EP0402357B1 EP 0402357 B1 EP0402357 B1 EP 0402357B1 EP 88909978 A EP88909978 A EP 88909978A EP 88909978 A EP88909978 A EP 88909978A EP 0402357 B1 EP0402357 B1 EP 0402357B1
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EP
European Patent Office
Prior art keywords
arc
electric
arcing horn
contact arrangement
main contacts
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
EP88909978A
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German (de)
French (fr)
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EP0402357A1 (en
Inventor
Andreas Cardinal
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Siemens AG
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Siemens AG
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Publication of EP0402357A1 publication Critical patent/EP0402357A1/en
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Publication of EP0402357B1 publication Critical patent/EP0402357B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • the invention relates to a contact arrangement for a low-voltage circuit breaker with main contacts for guiding a continuous current and with burn-off contacts for igniting a switching arc in the entry area of an arc quenching chamber, and with an arc guide piece made of one-piece stamped and bent part made of ferromagnetic material for transferring an arc occurring at the main contacts to the Arcing horn.
  • a contact arrangement of this type is known from DE-A-35 39 673. Thereafter, it is provided to manufacture the arc guide pieces as castings or as stamped and bent parts, with a massive, i.e. H. massive execution is considered advantageous. It has also been found that arc guiding pieces designed as castings ensure the desired mode of operation.
  • the object of the invention is to create an arc guide piece which can be produced as a stamped and bent part and which, with a simple design, nevertheless fulfills the task of quickly and reliably leading arcs arising at the main contacts to the arcing horn.
  • the arc-guiding piece which is designed as a one-piece stamped and bent part, extends approximately parallel to the row of main contacts and for attachment to the carrier of the main contacts serving base leg and an arc guiding leg starting from its end remote from the arcing horn and approaching it at an angle, the base leg having two base separating legs separated by an incision, which are mutually offset according to a gradation of the Have mounting surface of the arc guide.
  • the new arc guide piece thus does not have a closed triangular shape. Nevertheless, it was found that the same success as the triangular and solid arc guide piece was achieved.
  • the offset base partial legs allow the arc guiding piece to be secured against rotation with just one screw.
  • the outer end part of the arcing guide leg be bent approximately parallel to the arcing horn.
  • Figure 1 shows a section of a pole of a low-voltage circuit breaker with an arc guide.
  • FIG. 2 shows section II-II in FIG. 1, the left and right parts of FIG. 2 showing different embodiments.
  • FIGS. 3, 4 and 5 Details of the arc guiding piece are shown in FIGS. 3, 4 and 5, each of which shows views at right angles to one another.
  • the contact arrangement 1 comprises a fixed part 2 and a movable part 3 in a known manner
  • Main contact is used and for this purpose is provided with a contact piece support 6 or a larger number of such contact piece supports.
  • a fixed burn-off contact 7 is fastened close to the contact piece support 6, which is also provided with a contact piece support 10.
  • the current band 12 establishes the electrically conductive connection with the movable part 3 of the contact arrangement 1, which is pivotably mounted about a hinge pin 13 arranged between the legs of the U-shaped current band 12.
  • the movable part 3 comprises a carrier 14 on which the main contact lever 16, which is connected to the current band 12, is pivotably mounted about a hinge pin 15. These are provided at their upper end with contact piece supports 17 which cooperate with the fixed contact piece supports 6. Furthermore, the carrier 14 has a burn-off contact 20 which has a contact piece support 21 which interacts with the fixed contact piece support 10. Both the stationary part 2 and the movable part 3 of the contact arrangement have an arcing horn 22 or 23 in order to transfer switching arcs into an arcing chamber 24.
  • FIG. 2 shows, there are two fixed contact piece supports 6 as main contacts. Accordingly, the movable part 3 of the contact arrangement 1 has two arranged next to each other Contact lever with contact piece supports 17. Depending on the current that the circuit breaker should be able to handle with permissible heating, a larger number of main contacts can be provided. In order to illustrate this, two contact piece supports 6 are shown in the right part of FIG. 2, so that in this embodiment the contact arrangement has a total of four main contacts.
  • a switching arc occurs only at the burn-off contacts, provided that the total current flowing through the contact arrangement does not exceed a certain amount.
  • the switching arc is then taken over by the arcing horns 22 and 23 and transferred to the arcing chamber 24.
  • the current exceeds a certain size, the current is not completely commutated to the burn-off contacts, with the result that the main contacts, i. H. occur between the contact piece supports 6 and 17 partial arcs.
  • These partial arcs are taken over by arc guide pieces 30 and 40, respectively, which are shown in FIG. 3 in a form to be adapted to the respective embodiment of the contact arrangement. As can be seen, these arc guide pieces form guide edges for taking over the partial arcs occurring at the main contacts and for transferring them to the arcing horn 22.
  • 4 and 5 is a stamped and bent part made of sheet steel and has a base leg 31 which has two base part legs 33 and 34 separated by an incision 32. This not only provides an adaptation to the stepped shape of the connecting bar 5 in the area of the contact piece support 6, but also a rotation-proof seat when fastened with only one screw 25 (FIG. 1).
  • the base legs 33 and 34 have a mutual offset by an amount designated by 35.
  • the arc guide piece 30 has an arc guide leg 36, which is at an acute angle to the base leg 31 and leads with its upper, bent end part 37 to the arc horn 22.
  • the above-explained shape of the arc guide pieces can be applied to different widths; H. with a different number of main contacts provided contact arrangements so that the base leg is given a corresponding length and the length and the angular position of the arc guide leg is chosen appropriately. In this way, the arc guide piece 40 is obtained.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)

Abstract

A contact arrangement (1) for low-voltage power switches comprises main contacts and spark-arresting contacts (6, 17; 10; 21) and electric arcing horns (22, 23) which transfer a switching electric arc to an arc-control device. Additional electric arcing conductors (30; 40) absorb any partial electric arcs produced during high loading the main contacts (6; 17) of the contact arrangement (1) and conduct them to the corresponding electric arcing horn (22). The electric arc conductors are made in a single piece by stamping or bending; one of the electric arc conducting arms (36) branches off a base arm (31) which serves as a fastener, and makes an acute angle with the electric arcing horn (22).

Description

Kontaktanordnung mit einem Lichtbogerhorn und einem LichtbogenleitstückContact arrangement with an arcing horn and an arcing guide

Die Erfindung betrifft eine Kontaktanordnung für einen Niederspannungs-Leistungsschalter mit Hauptkontakten zur Führung eines Dauerstromes und mit Abbrennkontakten zur Zündung eines Schaltlichtbogens im Eintrittsbereich einer Lichtbogenlöschkammer sowie mit einem als einstückiges Stanz-Biegeteil hergestellten Lichtbogenleitstück aus ferromagnetischen Material zur Überführung eines an den Hauptkontakten auftretenden Lichtbogens zu dem Lichtbogenhorn.The invention relates to a contact arrangement for a low-voltage circuit breaker with main contacts for guiding a continuous current and with burn-off contacts for igniting a switching arc in the entry area of an arc quenching chamber, and with an arc guide piece made of one-piece stamped and bent part made of ferromagnetic material for transferring an arc occurring at the main contacts to the Arcing horn.

Eine Kontaktanordnung dieser Art ist durch die DE-A-35 39 673 bekannt geworden. Danach ist vorgesehen, die Lichtbogenleitstücke als Gußteile oder als Stanz-Biegeteile herzustellen, wobei eine massereiche, d. h. massive Ausführung als vorteilhaft angesehen wird. Es hat sich auch erwiesen, daß als Gußteile ausgeführte Lichtbogenleitstücke die angestrebte Wirkungsweise gewährleisten.A contact arrangement of this type is known from DE-A-35 39 673. Thereafter, it is provided to manufacture the arc guide pieces as castings or as stamped and bent parts, with a massive, i.e. H. massive execution is considered advantageous. It has also been found that arc guiding pieces designed as castings ensure the desired mode of operation.

Zur Vereinfachung des Herstellungsganges und zur Verringerung des Kostenaufwandes wäre es jedoch erwünscht, von der gleichfalls angegebenen Möglichkeit Gebrauch zu machen, die Lichtbogenleitstücke als Stanz-Biegeteil auszuführen. Dabei hat sich jedoch gezeigt, daß die angestrebte Wirkungsweise nur weniger vollkommen erzielt wird.To simplify the production process and to reduce the cost, however, it would be desirable to make use of the possibility also specified to design the arc guide pieces as a stamped and bent part. However, it has been shown that the desired mode of action is only achieved less completely.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein als Stanz-Biegeteil herstellbares Lichtbogenleitstück zu schaffen, welches dennoch bei einfacher Gestaltung die Aufgabe erfüllt, an den Hauptkontakten entstehende Lichtbögen rasch und zuverlässig zu dem Lichtbogenhorn zu führen.Proceeding from this, the object of the invention is to create an arc guide piece which can be produced as a stamped and bent part and which, with a simple design, nevertheless fulfills the task of quickly and reliably leading arcs arising at the main contacts to the arcing horn.

Dies gelingt gemäß der Erfindung dadurch, daß das als einstückiges Stanz-Biegeteil ausgebildete Lichtbogenleitstück einen sich etwa parallel zu der Reihe der Hauptkontakte erstreckenden und zur Befestigung an dem Träger der Hauptkontakte dienenden Basisschenkel und einen von dessen dem Lichtbogenhorn entfernten Ende ausgehenden und winklig an diesen heranführenden Lichtbogen-Führungsschenkel aufweist, wobei der Basisschenkel zwei durch einen Einschnitt getrennte Basis-Trennschenkel besitzt, die einen gegenseitigen Versatz entsprechend einer Abstufung der Befestigungsfläche des Lichtbogenleitstückes aufweisen. Im Unterschied zu dem vorstehend erwähnten bekannten Lichtbogenleitstück weist somit das neue Lichtbogenleitstück keine geschlossene dreieckige Form auf. Dennoch wurde festgestellt, daß der gleiche Erfolg wie bei dem dreieckigen und massiven Lichtbogenleitstück erzielt wird. Die versetzten Basis-Teilschenkel gestatten eine verdrehungssichere Befestigung des Lichtbogenleitstückes mit nur einer Schraube.This is achieved according to the invention in that the arc-guiding piece, which is designed as a one-piece stamped and bent part, extends approximately parallel to the row of main contacts and for attachment to the carrier of the main contacts serving base leg and an arc guiding leg starting from its end remote from the arcing horn and approaching it at an angle, the base leg having two base separating legs separated by an incision, which are mutually offset according to a gradation of the Have mounting surface of the arc guide. In contrast to the known arc guide piece mentioned above, the new arc guide piece thus does not have a closed triangular shape. Nevertheless, it was found that the same success as the triangular and solid arc guide piece was achieved. The offset base partial legs allow the arc guiding piece to be secured against rotation with just one screw.

Um einen guten Übergang der Lichtbögen auf das Lichtbogenhorn zu ereichen, empfiehlt es sich, daß äußere Endteil des Lichtbogen-Führungsschenkels etwa parallel zu dem Lichtbogenhorn abgebogen zu gestalten.In order to achieve a good transition of the arcs to the arcing horn, it is recommended that the outer end part of the arcing guide leg be bent approximately parallel to the arcing horn.

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 in einem Schnitt einen Pol eines Niederspannungs-Leistungsschalters mit einem Lichtbogenleitstück.Figure 1 shows a section of a pole of a low-voltage circuit breaker with an arc guide.

In der Figur 2 ist der Schnitt II-II in Figur 1 gezeigt, wobei der linke und der rechte Teil der Figur 2 unterschiedliche Ausführungsformen zeigen.FIG. 2 shows section II-II in FIG. 1, the left and right parts of FIG. 2 showing different embodiments.

Einzelheiten des Lichtbogenleitstückes sind in den Figuren 3, 4 und 5 dargestellt, die jeweils rechtwinklig zueinanderstehende Ansichten zeigen.Details of the arc guiding piece are shown in FIGS. 3, 4 and 5, each of which shows views at right angles to one another.

Die Kontaktanordnung 1 gemäß der Figur 1 umfaßt in bekannter Weise einen feststehenden Teil 2 und einen bewegbaren Teil 3. Als Träger des feststehenden Teiles 2 der Kontaktanordnung 1 dient ein Isolierblock 4, an dem eine obere Anschlußschiene 5 angebracht ist, die zugleich als Träger eines feststehenden Hauptkontaktes dient und hierzu mit einer Schaltstückauflage 6 oder einer größeren Anzahl solcher Schaltstückauflagen versehen ist. Auf der Anschlußschiene 5 ist nahe bei der Schaltstückauflage 6 ein feststehender Abbrennkontakt 7 befestigt, der gleichfalls mit einer Schaltstückauflage 10 versehen ist. An der Unterseite des im Profil winkelförmigen Isolierblockes 4 ist eine weitere, gegabelt ausgeführte Anschlußschiene 11 befestigt, mit der durch eine Schaubverbindung ein biegsames Stromband 12 verbunden ist. Das Stromband 12 stellt die elektrisch leitende Verbindung mit dem beweglichen Teil 3 der Kontaktanordnung 1 her, der um einen zwischen den Schenkeln des U-förmig gebogenen Strombandes 12 angeordneten Gelenkbolzen 13 schwenkbar gelagert ist. Der bewegbare Teil 3 umfaßt einen Träger 14, an dem um einen Gelenkbolzen 15 mit dem Stromband 12 in Verbindung stehende Hauptkontakthebel 16 schwenkbar gelagert sind. Diese sind an ihrem oberen Ende mit Schaltstückauflagen 17 versehen, die mit den ortsfsten Schaltstückauflagen 6 zusammenwirken. Ferner weist der Träger 14 einen Abbrennkontakt 20 auf, der eine mit der ortsfesten Schaltstückauflage 10 zusammenwirkende Schaltstückauflage 21 besitzt. Sowohl der ortsfeste Teil 2 als auch der bewegbare Teil 3 der Kontaktanordnung besitzt ein Lichtbogenhorn 22 bzw. 23, um Schaltlichtbögen in eine Lichtbogenlöschkammer 24 zu überführen.The contact arrangement 1 according to FIG. 1 comprises a fixed part 2 and a movable part 3 in a known manner Main contact is used and for this purpose is provided with a contact piece support 6 or a larger number of such contact piece supports. On the connecting rail 5, a fixed burn-off contact 7 is fastened close to the contact piece support 6, which is also provided with a contact piece support 10. On the underside of the insulating block 4, which is angular in profile, a further forked connecting rail 11 is attached, to which a flexible current band 12 is connected by a screw connection. The current band 12 establishes the electrically conductive connection with the movable part 3 of the contact arrangement 1, which is pivotably mounted about a hinge pin 13 arranged between the legs of the U-shaped current band 12. The movable part 3 comprises a carrier 14 on which the main contact lever 16, which is connected to the current band 12, is pivotably mounted about a hinge pin 15. These are provided at their upper end with contact piece supports 17 which cooperate with the fixed contact piece supports 6. Furthermore, the carrier 14 has a burn-off contact 20 which has a contact piece support 21 which interacts with the fixed contact piece support 10. Both the stationary part 2 and the movable part 3 of the contact arrangement have an arcing horn 22 or 23 in order to transfer switching arcs into an arcing chamber 24.

Wie die Figur 2 zeigt, sind zwei ortsfeste Schaltstückauflagen 6 als Hauptkontakte vorhanden. Dementspechend weist der bewegbare Teil 3 der Kontaktanordnung 1 zweinebeneinander angeordnete Kontakthebel mit Schaltstückauflagen 17 auf. In Abhängigkeit von dem Strom, den der Leistungsschalter mit einer zulässigen Erwärmung beherrschen soll, kann eine größere Anzahl von Hauptkontakten vorgesehen sein. Um dies zu veranschaulichen, sind im rechten Teil der Figur 2 zwei Schaltstückauflagen 6 gezeigt, so daß bei dieser Ausführung die Kontaktanordnung insgesamt vier Hauptkontakt aufweist.As FIG. 2 shows, there are two fixed contact piece supports 6 as main contacts. Accordingly, the movable part 3 of the contact arrangement 1 has two arranged next to each other Contact lever with contact piece supports 17. Depending on the current that the circuit breaker should be able to handle with permissible heating, a larger number of main contacts can be provided. In order to illustrate this, two contact piece supports 6 are shown in the right part of FIG. 2, so that in this embodiment the contact arrangement has a total of four main contacts.

Vollzieht sich die Bewegung der Teile beim Ausschalten in bekannterweise derart, daß zunächst die Hauptkontakte und danach die Abbrennkontakte voneinander getrennt werden, so entsteht ein Schaltlichtbogen nur an den Abbrennkontakten, sofern der über die Kontaktanordnung insgesamt fließende Strom eine gewisse Höhe nicht überschreitet. Oer Schaltlichtbogen wird dann von den Lichtbogenhörnern 22 und 23 übernommen und in die Lichtbogenlöschkammer 24 überführt. Übersteigt jedoch der Strom eine bestimmte Größe, so wird der Strom nicht vollständig auf die Abbrennkontakte kommutiert, mit dem Ergebnis, daß auch an den Hauptkontakten, d. h. zwischen den Schaltstückauflagen 6 und 17 Teillichtbögen auftreten. Diese Teillichtbögen werden durch Lichtbogenleitstücke 30 bzw. 40 übernommen, die in der Figur 3 in einer an die jeweilige Ausführung der Kontaktanordnung anzupassenden Form gezeigt sind. Wie man erkennt, bilden diese Lichtbogenleitstücke Führungskanten zur Übernahme der an den Hauptkontakten auftretenden Teillichtbögen und zu deren Überführung zu dem Lichtbogenhorn 22.If the movement of the parts takes place in a known manner when switching off, in such a way that first the main contacts and then the burn-off contacts are separated from one another, a switching arc occurs only at the burn-off contacts, provided that the total current flowing through the contact arrangement does not exceed a certain amount. The switching arc is then taken over by the arcing horns 22 and 23 and transferred to the arcing chamber 24. However, if the current exceeds a certain size, the current is not completely commutated to the burn-off contacts, with the result that the main contacts, i. H. occur between the contact piece supports 6 and 17 partial arcs. These partial arcs are taken over by arc guide pieces 30 and 40, respectively, which are shown in FIG. 3 in a form to be adapted to the respective embodiment of the contact arrangement. As can be seen, these arc guide pieces form guide edges for taking over the partial arcs occurring at the main contacts and for transferring them to the arcing horn 22.

Das Lichtbogenleitstück 30 gemäß den Figuren 3, 4 und 5 ist ein Stanz-Biegeteil aus Stahlblech und weist einen Basisschenkel 31 auf, der zwei durch einen Einschnitt 32 getrennte Basis-Teilschenkel 33 und 34 aufweist. Hierdurch ist nicht nur eine Anpassung an die abgestufte Gestalt der Anschlußschiene 5 im Bereich der Schaltstückauflage 6 gegeben, sondern zugleich ein verdrehungssicherer Sitz bei der Befestigung mit nur einer Schraube 25 (Figur 1). Die Basis-Teilschenkel 33 und 34 weisen eine gegenseitigen Versatz um ein mit 35 bezeichneten Maß auf. Ausgehend von dem bezüglich der Symmetrieachse der Kontaktanordnung außenliegenden Ende besitzt das Lichtbogenleitstück 30 einen Lichtbogenführungsschenkel 36, der im spitzen Winkel zu dem Basis-Schenkel 31 steht und mit seinem oberen, abgebogenen Endteil 37 an das Lichtbogenhorn 22 heranführt.3, 4 and 5 is a stamped and bent part made of sheet steel and has a base leg 31 which has two base part legs 33 and 34 separated by an incision 32. This not only provides an adaptation to the stepped shape of the connecting bar 5 in the area of the contact piece support 6, but also a rotation-proof seat when fastened with only one screw 25 (FIG. 1). The base legs 33 and 34 have a mutual offset by an amount designated by 35. Starting from the end lying outside with respect to the axis of symmetry of the contact arrangement, the arc guide piece 30 has an arc guide leg 36, which is at an acute angle to the base leg 31 and leads with its upper, bent end part 37 to the arc horn 22.

Wie bei eine Betrachtung der linken und der rechten Seite der in der Figur 2 gezeigten Kontaktanordnung zu erkennen ist, ist die vorstehend erläuterte Gestalt der Lichtbogenleitstücke an unterschiedlich breite, d. h. mit einer unterschiedlichen Anzahl von Hauptkontakten versehenen Kontaktanordnungen leicht daduch anzupassen, daß der Basisschenkel eine entsprechende Länge erhält und ebenso die Länge und die Winkelstellung des Lichtbogenführungsschenkels passend gewählt wird. Auf diese Weise wird das Lichtbogenleitstück 40 erhalten.As can be seen when examining the left and the right side of the contact arrangement shown in FIG. 2, the above-explained shape of the arc guide pieces can be applied to different widths; H. with a different number of main contacts provided contact arrangements so that the base leg is given a corresponding length and the length and the angular position of the arc guide leg is chosen appropriately. In this way, the arc guide piece 40 is obtained.

Mit Hilfe der beschriebenen neuen Lichtbogenleitstücke ist die Möglichkeit gegeben, die Leistungsfähigkeit von Kontaktanordnungen durch ein einfaches und preiswertes Zusatzteil erheblich zu steigern.With the help of the new arc guide pieces described, there is the possibility of significantly increasing the performance of contact arrangements by means of a simple and inexpensive additional part.

Claims (2)

1. Contact arrangement (1) for low-voltage circuit breakers having main contacts (6) for the guiding of a permanent current and having spark contacts (7) for the ignition of an arc in the entry region of an arc extinction chamber (24) as well as having at least one arcing horn (22) for the transmission of the arc into the arc extinction chamber (24) and having an arc conducting piece (30), manufactured as one-piece punched and bent component, of ferromagnetic material for the transmission of arcs occurring at the main contacts (6) to the arcing horn (22),
characterized in that the arc conducting piece (30) has a base limb (31) extending approximately parallel to the row of the main contacts (6) and serving to fasten to the carrier (5) the main contacts (6), and an arc guide limb (36) emanating from the end of the base limb which is removed from the arcing horn (22) and advancing towards it at an angle, whereby the base limb (31) has two base partial limbs (33, 34) separated by a recess (32), which have a mutual offset (35) corresponding to a step in the fastening area of the arc conducting piece (30).
2. Contact arrangement according to claim 1, characterized in that the outer end part (37) of the arc guide limb (36) is formed in offset manner approximately parallel to the arcing horn (22).
EP88909978A 1987-11-25 1988-11-04 Contact arrangement with electric arcing horn and electric arc conductor Expired - Lifetime EP0402357B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8715757U DE8715757U1 (en) 1987-11-25 1987-11-25
DE8715757U 1987-11-25

Publications (2)

Publication Number Publication Date
EP0402357A1 EP0402357A1 (en) 1990-12-19
EP0402357B1 true EP0402357B1 (en) 1991-10-30

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EP88909978A Expired - Lifetime EP0402357B1 (en) 1987-11-25 1988-11-04 Contact arrangement with electric arcing horn and electric arc conductor

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US (1) US5013875A (en)
EP (1) EP0402357B1 (en)
DE (2) DE8715757U1 (en)
WO (1) WO1989005036A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA432817A (en) * 1942-08-26 1946-01-29 Canadian Westinghouse Company Electric switch
DE1000486B (en) * 1954-05-04 1957-01-10 Calor Emag Elektrizitaets Ag Horn-shaped switch contact with an insert made of magnetic material
US3784775A (en) * 1972-07-27 1974-01-08 Ite Imperial Corp Arc runner between stationary contacts
DE3539673A1 (en) * 1985-11-06 1987-05-07 Siemens Ag CONTACT ARRANGEMENT FOR LOW VOLTAGE CIRCUIT BREAKERS WITH MAIN CONTACTS AND CURRENT CONTACTS
FR2613125B1 (en) * 1987-03-26 1995-01-06 Merlin Gerin CONTACT PART OF A MINIATURE CIRCUIT-BREAKER AND METHOD OF MANUFACTURING SUCH A PART FROM A BIMETALLIC STRIP

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Publication number Publication date
US5013875A (en) 1991-05-07
WO1989005036A1 (en) 1989-06-01
DE8715757U1 (en) 1988-02-18
EP0402357A1 (en) 1990-12-19
DE3865975D1 (en) 1991-12-05

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