EP2801995A1 - Schutzschalter - Google Patents

Schutzschalter Download PDF

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Publication number
EP2801995A1
EP2801995A1 EP12864570.2A EP12864570A EP2801995A1 EP 2801995 A1 EP2801995 A1 EP 2801995A1 EP 12864570 A EP12864570 A EP 12864570A EP 2801995 A1 EP2801995 A1 EP 2801995A1
Authority
EP
European Patent Office
Prior art keywords
bimetal
bimetal upper
open
trip bar
spring
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
EP12864570.2A
Other languages
English (en)
French (fr)
Other versions
EP2801995B1 (de
EP2801995A4 (de
Inventor
Nobuo Miyoshi
Masahiro Fushimi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2801995A1 publication Critical patent/EP2801995A1/de
Publication of EP2801995A4 publication Critical patent/EP2801995A4/de
Application granted granted Critical
Publication of EP2801995B1 publication Critical patent/EP2801995B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H73/48—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 having both electrothermal and electromagnetic automatic release
    • H01H73/50—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 having both electrothermal and electromagnetic automatic release reset by lever
    • 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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/325—Housings, assembly or disposition of different elements in the housing
    • 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H2071/168—Provisions for avoiding permanent deformation and thus decalibration of bimetal, e.g. due to overheating or action of a magnet
    • 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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H71/405—Combined electrothermal and electromagnetic mechanisms in which a bimetal forms the inductor for the electromagnetic 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
    • H01H71/50—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

Definitions

  • a conventional circuit breaker adapted to an electric path containing a harmonic component employs a thermal tripping device.
  • the thermal tripping device is configured to drive a trip bar by a bimetal which bends and deforms when overcurrent occurs on an electric path, thereby tripping an open/close mechanism portion.
  • a circuit breaker which has an extended plate provided at a head end of a bimetal (for example, see Patent Document 2).
  • the reason is as follows.
  • the trip bar connecting the open/close mechanism portion and the thermal tripping device has a stopper position spaced by a certain stroke after tripping of the open/close mechanism portion, and therefore the bimetal upon breaking is held at the stopper position, thereby causing permanent deformation.
  • this extended plate needs a plate material having a rigidity equal to that of the bimetal, and a bending amount of the bimetal upon breaking is directly transmitted to the bimetal. Therefore, it is difficult to prevent permanent deformation.
  • An object of the present invention is to, without great modification of the conventional outer shape and structure, provide a circuit breaker having a thermal tripping device which can realize stable operation without change in tripping time between before and after breaking.
  • the present invention is a circuit breaker including: an open/close mechanism portion for driving open/close contacts to open or close an electric path; an electromagnetic tripping device for driving a trip bar to trip the open/close mechanism portion, when overcurrent flows on the electric path; and a thermal tripping device for driving the trip bar by a bimetal which bends when overcurrent flows on the electric path, to trip the open/close mechanism portion.
  • the present invention makes it possible to, without great modification of the conventional outer shape and structure and with the minimum number of additional components, realize a thermal tripping device which can perform stable operation without change in tripping time between before and after breaking, and easily obtain a small-size circuit breaker that is adaptable to harmonic and has a high breaking capacity.
  • a circuit breaker 100 is formed using a housing 1 composed of a base 2 and a cover 3 which are formed by an insulation material.
  • the cover 3 covers the circuit breaking units for respective phases on the base 2, and the open/close mechanism portion 20.
  • An operation handle 21 of the open/close mechanism portion 20 protrudes from the cover 3.
  • the circuit breaking units for respective phases each have: a power-supply-side terminal 7 provided on the base 2; a fixed contact 4 provided so as to extend from the power-supply-side terminal 7; a movable contact 5 to contact with or be separated from the fixed contact 4; a movable contactor 6 rotatably held by the cross bar 10, with the movable contact 5 being provided at one end of the movable contactor 6; a tripping device 30 connected to the movable contactor 6 via a movable element holder 9; and a load-side terminal 8 connected to the tripping device 30 and provided on the base 2.
  • the fixed contact 4 and the movable contact 5 compose open/close contacts for opening or closing an electric path.
  • the cross bar 10 is disposed at a bottom portion of the base 2, and extends perpendicularly to the drawing surface of FIG. 1 .
  • the cross bar 10 is rotated about the axis thereof by the open/close mechanism portion 20.
  • the movable contactors 6 of the circuit breaking units for respective phases are attached to the cross bar 10.
  • the movable contactors 6 of the circuit breaking units for respective phases are simultaneously rotated, and the rotation of the movable contactor 6 causes the movable contact 5 to contact with or to be separated from the fixed contact 4.
  • the open/close mechanism portion 20 is formed by a known toggle link mechanism, and has a known trip bar 22 which is driven by the tripping device 30, and a trip bar stopper 23 which locks the trip bar 22 at the maximum trip position.
  • the tripping device 30 is composed of an electromagnetic tripping device 40 and a thermal tripping device 50 as shown in FIG. 2 .
  • the electromagnetic tripping device 40 has: a fixed iron core 41; a movable iron core 42 which is to be adhered to the fixed iron core 41 upon instantaneous breaking, to drive the trip bar 22; a return spring 43 energizing the movable iron core 42; and a shaft 44 pivotably supporting the movable iron core 42.
  • FIG. 3(a) and FIG. 3(b) are enlarged perspective views of a major part of the thermal tripping device 50 as seen from respective directions opposite to each other.
  • the thermal tripping device 50 has: a bimetal 51 having a lower end fixedly connected to the movable element holder 9; a bimetal upper base 52 fixed on a head end of the bimetal 51; a bimetal upper 54 pivotably supported by the bimetal upper base 52 with a rotary shaft 53 used as a pivot, with an overcurrent characteristic adjustment screw 57 being screwed into the bimetal upper 54; and a bimetal upper spring 56 held by the bimetal upper base 52 and energizing the bimetal upper 54 toward the trip bar 22, for giving a movable load.
  • the bimetal upper 54 is constantly energized by the bimetal upper spring 56 while contacting with a bimetal upper stopper 55 provided on the bimetal upper base 52.
  • a spring load on the bimetal upper 54 is set to be greater than a tripping load, at an abutting position of the trip bar 22.
  • An electric conduction connection member 58 is fixed at an upper end of the bimetal 51 by a rivet 60.
  • the bimetal 51 is connected to the load-side terminal 8 via the electric conduction connection member 58 and a flexible conductor 59 so that current of the electric path can flow therethrough.
  • FIG. 3 an example where the bimetal upper base 52 is integrally formed with the electric conduction connection member 58, has been shown.
  • the bimetal upper base 52 and the electric conduction connection member 58 may be separately formed and then may be fixed with each other by welding or the like.
  • the overcurrent characteristic adjustment screw 57 Since the overcurrent characteristic adjustment screw 57 is fixed to the bimetal 51 via the bimetal upper 54 and the bimetal upper base 52, when the bimetal 51 has been bent, the overcurrent characteristic adjustment screw 57 pushes the trip bar 22, whereby the open/close mechanism portion 20 is driven to rotate the movable contactor 6. By the rotation of the movable contactor 6, the movable contact 5 is separated from the fixed contact 4, whereby the operation of current breaking is completed (see FIGS. 4 to 6 ).
  • the bimetal upper 54 is constantly energized toward the trip bar 22 by the bimetal upper spring 56 while contacting with the bimetal upper stopper 55 provided on the bimetal upper base 52.
  • FIG. 7 is an explanation diagram showing a load characteristic of the bimetal upper 54 of the thermal tripping device 50 as compared to that in the conventional structure.
  • the spring load on the bimetal upper 54 is set to be greater than the tripping load, at the abutting position of the trip bar 22, and also, is set to be smaller than a spring load on the extended plate in the conventional structure, at the lock position of the trip bar 22.
  • the bimetal upper 54 can push the trip bar 22 without rotating, and also, in the state where the trip bar 22 is driven and thereby the open/close mechanism portion 20 is tripped, the bimetal upper spring 56 bends in accordance with a load applied to the bimetal upper 54.
  • the movable iron core 42 When overcurrent such as short-circuit current flows, the movable iron core 42 is adhered to the fixed iron core 41 owing to magnetic force generated in the fixed iron core 41 of the electromagnetic tripping device 40, whereby the movable iron core 42 rotates about the shaft 44 as a pivot against energizing force of the return spring 43.
  • the rotation causes the movable iron core 42 to push the trip bar 22, whereby the open/close mechanism portion 20 is driven to rotate the movable contactor 6.
  • the rotation of the movable contactor 6 causes the movable contact 5 to be separated from the fixed contact 4, whereby the overcurrent is interrupted and the trip operation is completed.
  • the bimetal 51 is bent.
  • the bending stroke is equal to or greater than a stroke for the trip bar 22 to abut the trip bar stopper 23 of the open/close mechanism portion 20.
  • the bending stroke of the bimetal 51 is forcibly fixed by the trip bar stopper 23 of the open/close mechanism portion 20 and thereby permanently deformed.
  • the bimetal upper spring 56 is bent and the bimetal upper 54 rotates, whereby permanent deformation of the bimetal 51 can be prevented.
  • FIG. 8(a) and FIG. 8(b) are enlarged perspective views of a major part of the thermal tripping device 50 as seen from respective directions opposite to each other.
  • FIG. 9 is an enlarged side view showing a tripping device at the maximum trip position, according to embodiment 2.
  • embodiment 2 uses a compression spring as the bimetal upper spring, a tension spring or the like may be used, which can obtain the same effect.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP12864570.2A 2012-01-06 2012-01-06 Schutzschalter Active EP2801995B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/050174 WO2013103015A1 (ja) 2012-01-06 2012-01-06 回路遮断器

Publications (3)

Publication Number Publication Date
EP2801995A1 true EP2801995A1 (de) 2014-11-12
EP2801995A4 EP2801995A4 (de) 2015-11-04
EP2801995B1 EP2801995B1 (de) 2016-09-28

Family

ID=48745085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12864570.2A Active EP2801995B1 (de) 2012-01-06 2012-01-06 Schutzschalter

Country Status (5)

Country Link
EP (1) EP2801995B1 (de)
JP (1) JP5676782B2 (de)
KR (1) KR101579698B1 (de)
CN (1) CN104067366B (de)
WO (1) WO2013103015A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102514032B1 (ko) 2016-02-22 2023-03-24 엘에스일렉트릭(주) 배선용 차단기의 순시 트립 기구
WO2019106836A1 (ja) * 2017-12-01 2019-06-06 三菱電機株式会社 コンタクタ
CN110400729B (zh) * 2019-08-27 2024-04-26 乐清市赛翔电气有限公司 一种小型断路器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2506486Y2 (ja) * 1989-07-06 1996-08-07 富士電機株式会社 回路遮断器の過電流引外し装置
JP2000149756A (ja) * 1998-11-05 2000-05-30 Mitsubishi Electric Corp 回路遮断器の過電流引外し装置
JP4905112B2 (ja) 2006-12-18 2012-03-28 富士電機機器制御株式会社 回路遮断器の過電流引外し装置
JP5405971B2 (ja) * 2008-11-07 2014-02-05 三菱電機株式会社 回路遮断器
JP2010218765A (ja) * 2009-03-13 2010-09-30 Fuji Electric Fa Components & Systems Co Ltd 回路遮断器の過電流引外し装置

Also Published As

Publication number Publication date
JP5676782B2 (ja) 2015-02-25
KR20140065010A (ko) 2014-05-28
CN104067366B (zh) 2016-05-04
JPWO2013103015A1 (ja) 2015-05-11
KR101579698B1 (ko) 2015-12-22
EP2801995B1 (de) 2016-09-28
EP2801995A4 (de) 2015-11-04
WO2013103015A1 (ja) 2013-07-11
CN104067366A (zh) 2014-09-24

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