EP0635859A1 - Lastschalter mit einem Bedienungsmechanismus welcher durch einen elektromagnetische Auslöser gesteuert wird - Google Patents

Lastschalter mit einem Bedienungsmechanismus welcher durch einen elektromagnetische Auslöser gesteuert wird Download PDF

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Publication number
EP0635859A1
EP0635859A1 EP94410048A EP94410048A EP0635859A1 EP 0635859 A1 EP0635859 A1 EP 0635859A1 EP 94410048 A EP94410048 A EP 94410048A EP 94410048 A EP94410048 A EP 94410048A EP 0635859 A1 EP0635859 A1 EP 0635859A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
arm
movable
cover
contact
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.)
Granted
Application number
EP94410048A
Other languages
English (en)
French (fr)
Other versions
EP0635859B1 (de
Inventor
Alain Schneider Electric Sa Menier
Pascal Schneider Electric SA Mannequin
Eric Schneider Electric SA Domejan
Jean-Yves Amblard
Philippe Schneider Electric SA Delcambre
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.)
Schneider Electric SE
Original Assignee
Schneider Electric SE
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
Application filed by Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0635859A1 publication Critical patent/EP0635859A1/de
Application granted granted Critical
Publication of EP0635859B1 publication Critical patent/EP0635859B1/de
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
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements

Definitions

  • the present invention relates to a circuit breaker comprising at least one pair of separable contacts of which at least one is movable, a control mechanism piloted by at least one electromagnetic propellant, in the air gap of which is disposed a movable arm carrying the movable contact, this arm being arranged to provide an opening function of said separable contacts in the event of a short circuit.
  • Such a circuit breaker is known for example from the German patent N o 942 455.
  • This patent discloses the principle of electrodynamic propellants which ensure good breaking of the circuit breakers, in particular of high ratings which have only a small number of turns, sometimes even a single turn, thanks to a quick tilting of the movable contact arm.
  • This tilting is due to the electrodynamic repulsion defined by Laplace's law applied to the contact arm traversed by a current and disposed between the poles of the magnetic circuit.
  • this repulsion is greatly amplified thanks to the very strong field prevailing in the air gap of the magnetic circuit.
  • the performance of the system is all the more important as the length of the arm of the movable contact traversed by the current is greater. Now it turns out that the root of the arc tends to make a retrograde movement on this arm, which has the effect of greatly reducing the moments of the repulsive forces, by reducing the length of the arm traversed by the current.
  • the present invention proposes to overcome this drawback by providing a circuit breaker in which retrograde movement of the root of the arc is prevented, whatever the origin of the recoil.
  • circuit breaker characterized in that said movable arm is equipped with an insulating or electrically weakly conductive cover, formed at the rear of said movable contact, that the fixed contact is arranged at one end of the air gap, and that the contact arm is pivotally mounted about an axis located opposite the fixed contact, the cover extending between the movable contact and said axis, and being made of a material having a resistance high thermal.
  • any retrograde movement of the arc along the contact arm is inhibited by the presence of the insulating cover.
  • the arc remains anchored on the movable contact so as to maintain the optimal length traveled by the current in the air gap.
  • the cover consists of a molded piece of insulating synthetic material, in particular of polyamide amide.
  • this cover is constituted by a part shaped from an electrically weakly conductive material, such as, for example, steel.
  • the circuit breaker 10 shown diagrammatically comprises an input terminal 11, an output terminal 12 and a manual control handle 13, these elements being housed in a housing 14 provided with a base 15 which allows the mounting of this circuit breaker on appropriate supports of an electrical panel. It further comprises a fixed contact 16 and a movable contact 17 which is carried by a movable arm 18.
  • a bimetal thermal trip device 20 is connected by a link 19 to the trip lever 21 of the latching control mechanism 22.
  • the control mechanism 22 is linked to the movable arm 18 for the opening of the contacts, either following a manual intervention on the lever 13, or following a triggering caused by the bimetallic strip 20, or under the effect of a electrodynamic repulsion of the movable arm 18 in the event of a short circuit.
  • FIG. 2 illustrates the propellant 24 with a magnetic circuit 25 intended to actuate the movable arm 18 by electrodynamic repulsion in the event of a short circuit.
  • This magnetic circuit 25 comprises two pole pieces 30 and 31 defining an air gap 32 in which is housed the movable arm 18 which carries the movable contact 17, and a core 33 carrying one or more turns of a winding 34 traversed by the current.
  • the very intense field which prevails in the air gap 32 exerts significant electromagnetic forces on the arm mobile 18 which pivots about its axis 35, which has the effect of opening the separable contacts 16, 17.
  • the arm 18 is equipped with a cover 40 (see figure 2) or 41 (see figure 3) which is arranged at the rear of the movable contact 17 on the movable arm 18.
  • This cover can be produced in the form of a molded part made of an insulating synthetic material. It can also be produced by machining or folding a part from a weakly conductive material such as certain steels.
  • the movable arm 18 can have different shapes and the cover 40 can come in various variant embodiments which are adapted to the different shapes of the movable arm. This is for example the case of the embodiments shown respectively in FIGS. 2 and 3.
  • the root of the electric arc tends to move to an area for which the path of the arc is shorter. If one wishes to avoid such a displacement and maintain this root on the movable contact, it is essential to isolate the neighboring zones whose distance to the fixed contact decreases during the tilting of the movable arm. This insulation is obtained thanks to the cover 40, 41 described above.
  • the positioning of the contacts 16, 17 relative to the propellant 24 is such that the pad of the fixed contact 16 is arranged in the vicinity of the lower part of the air gap 32.
  • the middle of the pad is substantially in the frontal plane of pole pieces 30, 31, half of the patch being inserted in the air gap 32, and the other half projecting outward.
  • the width of the pad of the fixed contact 16 is less than the thickness of the air gap 32, and substantially equal to the sum of the width of the contact arm 18 and of the insulating cover 40.
  • the width of the contact arm 18 movable in the air gap 32 is thus reduced to a minimum, which also makes it possible to reduce the size of the magnetic circuit 25.
  • the thermal resistance of the insulating material used for the cover 40 must withstand temperatures greater than 350 °.
  • a particularly advantageous insulating material is the polyamide amide, which can be used in the form of a very thin film.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP19940410048 1993-07-19 1994-07-08 Lastschalter mit einem Bedienungsmechanismus welcher durch einen elektromagnetische Auslöser gesteuert wird Expired - Lifetime EP0635859B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9308933A FR2708140B1 (fr) 1993-07-19 1993-07-19 Disjoncteur pourvu d'un mécanisme de commande à accrochage pilote par un propulseur électromagnétique.
FR9308933 1993-07-19

Publications (2)

Publication Number Publication Date
EP0635859A1 true EP0635859A1 (de) 1995-01-25
EP0635859B1 EP0635859B1 (de) 1998-12-23

Family

ID=9449445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940410048 Expired - Lifetime EP0635859B1 (de) 1993-07-19 1994-07-08 Lastschalter mit einem Bedienungsmechanismus welcher durch einen elektromagnetische Auslöser gesteuert wird

Country Status (3)

Country Link
EP (1) EP0635859B1 (de)
DE (1) DE69415426T2 (de)
FR (1) FR2708140B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001859A1 (en) * 1995-06-26 1997-01-16 Square D Company Arc-resistant shield for protecting a movable contact carrier of a circuit breaker
FR2768856A1 (fr) * 1997-09-24 1999-03-26 Schneider Electric Sa Disjoncteur a declencheur electromagnetique a propulseur d'un contact mobile a fourche
CN102568964A (zh) * 2012-03-08 2012-07-11 江苏辉能电气有限公司 一种塑壳断路器可动静触头的保护组件
CN104576247A (zh) * 2015-01-05 2015-04-29 无锡新宏泰电器科技股份有限公司 一种防跌落单断点触头操作机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104576246B (zh) * 2014-12-31 2017-03-29 上海永继电气股份有限公司 小型断路器的动触头组件及其制造方法
CN108766845B (zh) * 2018-08-20 2024-03-19 厦门大恒科技有限公司 一种液压电磁铁结构以及断路器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR883446A (fr) * 1941-07-12 1943-07-05 Licentia Gmbh Disjoncteur électrique de surintensité
DE942455C (de) * 1941-07-12 1956-05-03 Aeg Elektrischer UEberstromselbstschalter fuer Wechselstrom
US4546337A (en) * 1983-09-02 1985-10-08 Eaton Corporation Residential circuit breaker with one piece slot motor
US4791393A (en) * 1983-12-19 1988-12-13 Westinghouse Electric Corp. Molded case circuit breaker with movable upper electrical contact positioned by torsion springs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR883446A (fr) * 1941-07-12 1943-07-05 Licentia Gmbh Disjoncteur électrique de surintensité
DE942455C (de) * 1941-07-12 1956-05-03 Aeg Elektrischer UEberstromselbstschalter fuer Wechselstrom
US4546337A (en) * 1983-09-02 1985-10-08 Eaton Corporation Residential circuit breaker with one piece slot motor
US4791393A (en) * 1983-12-19 1988-12-13 Westinghouse Electric Corp. Molded case circuit breaker with movable upper electrical contact positioned by torsion springs

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001859A1 (en) * 1995-06-26 1997-01-16 Square D Company Arc-resistant shield for protecting a movable contact carrier of a circuit breaker
FR2768856A1 (fr) * 1997-09-24 1999-03-26 Schneider Electric Sa Disjoncteur a declencheur electromagnetique a propulseur d'un contact mobile a fourche
EP0905735A1 (de) * 1997-09-24 1999-03-31 Schneider Electric Sa Schutzschalter mit elektromagnetischen Auslöser mit Antrieb für einen beweglichen und gabelförmigen Kontakt
CN102568964A (zh) * 2012-03-08 2012-07-11 江苏辉能电气有限公司 一种塑壳断路器可动静触头的保护组件
CN102568964B (zh) * 2012-03-08 2014-03-19 江苏辉能电气有限公司 一种塑壳断路器可动静触头的保护组件
CN104576247A (zh) * 2015-01-05 2015-04-29 无锡新宏泰电器科技股份有限公司 一种防跌落单断点触头操作机构

Also Published As

Publication number Publication date
DE69415426T2 (de) 1999-06-10
FR2708140B1 (fr) 1995-09-01
FR2708140A1 (fr) 1995-01-27
EP0635859B1 (de) 1998-12-23
DE69415426D1 (de) 1999-02-04

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