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EP1003191A1 - Thermomagnetischer Schutzschalter - Google Patents

Thermomagnetischer Schutzschalter Download PDF

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Publication number
EP1003191A1
EP1003191A1 EP98203874A EP98203874A EP1003191A1 EP 1003191 A1 EP1003191 A1 EP 1003191A1 EP 98203874 A EP98203874 A EP 98203874A EP 98203874 A EP98203874 A EP 98203874A EP 1003191 A1 EP1003191 A1 EP 1003191A1
Authority
EP
European Patent Office
Prior art keywords
lever
breaker
movable contact
fact
operating
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
EP98203874A
Other languages
English (en)
French (fr)
Other versions
EP1003191B1 (de
Inventor
Elio Jacovino
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.)
ABB SACE SpA
Original Assignee
ABB Elettrocondutture SpA
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 ABB Elettrocondutture SpA filed Critical ABB Elettrocondutture SpA
Priority to ES98203874T priority Critical patent/ES2256914T3/es
Priority to AT98203874T priority patent/ATE315832T1/de
Priority to DE69833158T priority patent/DE69833158T2/de
Priority to EP98203874A priority patent/EP1003191B1/de
Publication of EP1003191A1 publication Critical patent/EP1003191A1/de
Application granted granted Critical
Publication of EP1003191B1 publication Critical patent/EP1003191B1/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/046—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using snap closing mechanisms
    • H01H2300/048—Snap closing by latched movable contact, wherein the movable contact is held in a minimal distance from the fixed contact during first phase of closing sequence in which a closing spring is charged

Definitions

  • the present invention relates to a thermomagnetic circuit-breaker with means for adjusting the motion of the movable contacts.
  • thermomagnetic circuit-breakers may feature, in accordance with the regulations in force, a so-called dependent closing movement, which in essence means that the movement of the movable contacts depends on the movement of an operating knob or lever.
  • said operating knob brings the movable contact closer to the fixed contact; then, electrically coupling between contacts is achieved by means of a subsequent elastic thrust on the movable contact in order to increase the tightness of contact and generate the contact pressure.
  • circuit breakers of this type With circuit breakers of this type, the interruption of a closing operation for any reason and at any angle of travel of the operating knob could happen when the movable contact has already reached a position close to the fixed contact or even is yet in contact with it without the necessary pressure; in this cases, damages to the contacts could occur.
  • the contact pressure could be insufficient, inevitably creating contact wear if they are subjected to multiple electrical operations.
  • Thermomagnetic circuit-breakers have already been launched on the market that have a dependent operation in a first part until reaching a predetermined stop distance of the movable contact in relation to the fixed contact, said distance being then exceeded with a tripping movement that performs the closing.
  • a further drawback is in addition constituted by the fact that the operating lever or knob and the operating lever need to have opposing directions of rotation, thus creating considerable manufacturing complications and significant limitations regarding the dimensions and positioning.
  • thermomagnetic circuit-breaker with means for adjusting the motion of the movable contacts in which it is possible to predetermine a stop distance for the movable contacts in relation to the fixed contacts that is always constant and defined by the design geometry so that one always has a safety condition.
  • a particular object of the invention is to provide a thermomagnetic circuit-breaker in which it is possible to guarantee a minimum insulation distance between the contacts when interrupting the closing operation for any reason at any angle of travel of the knob.
  • Another object of the present invention is to provide a thermomagnetic circuit-breaker in which the minimum contact pressure is practically the same as the nominal pressure even with a slow closing operation, thus ensuring lower contact wear.
  • a further object of the present invention is to provide a thermomagnetic circuit-breaker which can be used, in its general constructional lines, as a circuit-breaker with dependent operation if desired, offering the possibility, with the addition of an easily-installed part, of increasing the functionality of the circuit-breaker with the introduction of the predetermined stopping distance of the contacts before the closing tripping movement.
  • thermomagnetic circuit-breaker with means for adjusting the motion of the movable contacts that can be easily obtained using common commercially-available elements and materials and that is, furthermore, competitive from a purely economic standpoint.
  • thermomagnetic circuit-breaker comprising a moulded case containing a movable contact and a fixed contact, the movable contact being connected to an operating lever controlled by a trip lever and operatively associated to an operating knob, characterised by the fact that it comprises an auxiliary lever engageable with said movable contact to hold it at a predetermined distance from said fixed contact during closing operations, said auxiliary lever being operatively coupled with the operating knob to release the movable contact allowing completion of the closing operation.
  • thermomagnetic circuit-breaker with means for adjusting the motion of the movable contacts illustrated purely by way of example and without limitation with the aid of the attached drawings in which:
  • thermomagnetic circuit-breaker includes a moulded case overall indicated by reference number 1 which substantially has a standardised conformation typical of thermomagnetic circuit-breakers for connection to omega-shaped bars.
  • Movable electric contacts indicated by 2 for the phase contact and 3 for the neutral contact, are provided inside the moulded case 1.
  • the movable contacts are connected to an operating lever 4 that is controlled by a trip lever 5 and associated with an operating knob or lever 7 by means of a U bolt 6.
  • the movable contacts 2 and 3 are available for contact with corresponding fixed contacts 8 defined inside the moulded case.
  • a spring associated to the trip lever 5 indicated overall by 10 acts between the operating lever 4 and the trip lever 5; said spring 10 has the distinctive feature of being of the hairpin type with an axial appendix 10a held in a corresponding seat of the trip lever 5 and a radial appendix 10b that engages with a catch projection 11.
  • the projection 11 is defined on the operating lever 4 at the moment of assembly of the lever 5 and the operating lever 4 itself.
  • the movable contacts 2 and 3 have contact springs, indicated by 15, also of the hairpin type, that interact with a catch projection 16 located on the operating lever and with an appendix 17 defined by the movable contact.
  • thermomagnetic circuit-breaker features an opening release that operates by means of the relative rotation of the operating lever in relation to the trip lever 5; the operation can occur by means of the action of a thrust pin 18 connected to a relay 19 that acts on the trip lever, for example in case of a high fault current (short circuit).
  • a bimetallic strip 20 is provided that acts on a thermal trip lever 21 in the event of an overload; this strip 20 transmits the movement to the trip lever.
  • the distinctive feature of the invention is constituted by the fact that an auxiliary lever 30 is provided that pivots alongside the axis of the operating lever and has the function of movably stopping the movable electric contacts during closing operations at a predetermined distance from the fixed contact 8.
  • the auxiliary lever has a body 31 that terminates in a head 32 and defines, on the part facing the movable contacts, a recess 33 in which a prominence 34 of the movable contacts engages.
  • the head 32 features a protuberance 35 that extends from the opposite side in relation to said recess 33 and is designed to interact with a cam 36 that is connected to the operating knob 7.
  • the movable contacts are positioned at a distance from the fixed contact, and the prominence 34 is engaged with the auxiliary lever close to the pivoting zone; as illustrated, the lever 30, pushed by a spring 40, associated to the lever 30 itself, is held against the prominence 34 in a lower area of the recess 33.
  • the rotation of the knob causes the operating lever to rotate at a speed dependent on that of the knob 7 by means of a U bolt 6, bringing the movable contacts close to the fixed contact 8 until stopping at a predetermined distance due to the engagement of the prominence 34 with a catch projection defined by the head 32 at the end of the recess 33.
  • the pressure action applied is therefore substantially constant and, even in cases where slow operation is executed, the pressure applied is still substantially the same as the nominal pressure.
  • a further aspect worthy of emphasis is constituted by the fact that the operating knob and the operating lever rotate in the same direction, thus significantly simplifying the structure of the device.
  • auxiliary lever and related spring are elements that can be added to a thermomagnetic circuit-breaker that would behave like a traditional device without the presence of such a lever.
  • the design and implementation of the cams together with the operating knob and auxiliary lever ensure that the movable contacts do not encounter obstacles in their opening travel that could be the cause of jamming or loss of performance in the event of a short circuit.
  • a further important aspect is in addition constituted by the fact that the spring of the trip lever acts between the trip lever and the operating lever, thus having greater speed of response in use.

Landscapes

  • Breakers (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Thermally Actuated Switches (AREA)
EP98203874A 1998-11-19 1998-11-19 Thermomagnetischer Schutzschalter Expired - Lifetime EP1003191B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES98203874T ES2256914T3 (es) 1998-11-19 1998-11-19 Interruptor magnetotermico.
AT98203874T ATE315832T1 (de) 1998-11-19 1998-11-19 Thermomagnetischer schutzschalter
DE69833158T DE69833158T2 (de) 1998-11-19 1998-11-19 Thermomagnetischer Schutzschalter
EP98203874A EP1003191B1 (de) 1998-11-19 1998-11-19 Thermomagnetischer Schutzschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98203874A EP1003191B1 (de) 1998-11-19 1998-11-19 Thermomagnetischer Schutzschalter

Publications (2)

Publication Number Publication Date
EP1003191A1 true EP1003191A1 (de) 2000-05-24
EP1003191B1 EP1003191B1 (de) 2006-01-11

Family

ID=8234342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98203874A Expired - Lifetime EP1003191B1 (de) 1998-11-19 1998-11-19 Thermomagnetischer Schutzschalter

Country Status (4)

Country Link
EP (1) EP1003191B1 (de)
AT (1) ATE315832T1 (de)
DE (1) DE69833158T2 (de)
ES (1) ES2256914T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051807B8 (de) * 2006-11-03 2008-06-26 Abb Ag Elektrischer Schalter
WO2015177143A1 (de) * 2014-05-22 2015-11-26 Eaton Industries (Austria) Gmbh Schaltgerät
WO2015177144A1 (de) * 2014-05-22 2015-11-26 Eaton Industries (Austria) Gmbh Schaltgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046841A1 (de) * 1980-08-21 1982-03-10 Licentia Patent-Verwaltungs-GmbH Schaltmechanismus für Leitungsschutzschalter
US4687891A (en) * 1985-05-13 1987-08-18 Merlin Gerin Fast manual closing mechanism of a miniature circuit breaker
US4740770A (en) * 1985-10-31 1988-04-26 Merlin Gerin Operating mechanism for a low voltage electrical circuit breaker
DE3721069A1 (de) * 1987-02-10 1988-08-18 Serd Soc Et Realisa Disjonct Mehrpoliger niederspannungs-selbstschalter mit handeinschaltung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046841A1 (de) * 1980-08-21 1982-03-10 Licentia Patent-Verwaltungs-GmbH Schaltmechanismus für Leitungsschutzschalter
US4687891A (en) * 1985-05-13 1987-08-18 Merlin Gerin Fast manual closing mechanism of a miniature circuit breaker
US4740770A (en) * 1985-10-31 1988-04-26 Merlin Gerin Operating mechanism for a low voltage electrical circuit breaker
DE3721069A1 (de) * 1987-02-10 1988-08-18 Serd Soc Et Realisa Disjonct Mehrpoliger niederspannungs-selbstschalter mit handeinschaltung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051807B8 (de) * 2006-11-03 2008-06-26 Abb Ag Elektrischer Schalter
WO2015177143A1 (de) * 2014-05-22 2015-11-26 Eaton Industries (Austria) Gmbh Schaltgerät
WO2015177144A1 (de) * 2014-05-22 2015-11-26 Eaton Industries (Austria) Gmbh Schaltgerät
US20170178842A1 (en) * 2014-05-22 2017-06-22 Eaton Industries (Austria) Gmbh Switching device

Also Published As

Publication number Publication date
ES2256914T3 (es) 2006-07-16
DE69833158D1 (de) 2006-04-06
EP1003191B1 (de) 2006-01-11
DE69833158T2 (de) 2006-08-31
ATE315832T1 (de) 2006-02-15

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