GB1250773A - - Google Patents

Info

Publication number
GB1250773A
GB1250773A GB5568468A GB1250773DA GB1250773A GB 1250773 A GB1250773 A GB 1250773A GB 5568468 A GB5568468 A GB 5568468A GB 1250773D A GB1250773D A GB 1250773DA GB 1250773 A GB1250773 A GB 1250773A
Authority
GB
United Kingdom
Prior art keywords
switch
contact
plunger
effected
screw
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
Application number
GB5568468A
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 filed Critical
Publication of GB1250773A publication Critical patent/GB1250773A/en
Expired legal-status Critical Current

Links

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
    • H01H73/22—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 electrothermal release and no other automatic release
    • H01H73/30—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 electrothermal release and no other automatic release reset by push-button, pull-knob or slide
    • 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
    • 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
    • H01H71/7445—Poly-phase adjustment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
    • 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
    • H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

1,250,773. Thermal switches. J. A. CRABTREE & CO. Ltd. 17 Nov., 1969 [23 Nov., 1968], No. 55684/68. Heading H1N. [Also in Division H2] A polyphase protective device responsive to overload and unbalanced conditions comprises bimetallic elements 15a in each phase, slidable members 7, 8 operated by the elements, a bellcrank 6 interconnecting the slidable members 7, 8 and operating an overcentre switch device 1, 2, 4, a reset plunger 31 which may be rotated for enabling hand or automatic reset, and adjusting means for the switch and the bell-crank. The bell-crank 6 is adjusted by a screw 40 which co-operates with a projection 7a from the member 7, this projection 7a abutting an ambient temperature compensating bimetal 19 to cause relative motion between the members 7, 8 and operation of the switch when balanced overload conditions exist. The switch has metal blades 1, 2 pivoted on a bracket 3 and maintained in an over-centre position by a C-spring 4. The position of the bracket 3 is adjusted by a screw 14 and one position of the blade 2 is determined by a screw 41. The screws 14, 40, 41 are adjusted on assembly, the overload setting by the user being effected by a manually operated lever which engages a further lever (both not shown) having a tooth entering a guide slot 26 in the bimetal 19 and a cam surface engaging the face of the bimetal. The switch has a moving contact 5 which engages a fixed contact 9, e.g. to complete the coil circuit of a motor starting contactor, or a fixed contact 10, e.g. in a signal circuit. When the plunger 31 is turned it cams the contact 10 from the manual reset position shown to a position nearer the contact 9 so that the switch resets when the bimetallic elements cool. Manual resetting is effected by depressing the plunger 31 to cause the contact 10 to move the switch back over centre, auxiliary series contacts 34 being opened by the plunger while resetting is being effected.
GB5568468A 1968-11-23 1968-11-23 Expired GB1250773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5568468 1968-11-23

Publications (1)

Publication Number Publication Date
GB1250773A true GB1250773A (en) 1971-10-20

Family

ID=10474581

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5568468A Expired GB1250773A (en) 1968-11-23 1968-11-23

Country Status (4)

Country Link
US (1) US3638158A (en)
DE (1) DE1958417A1 (en)
FR (1) FR2023991A1 (en)
GB (1) GB1250773A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199990A (en) * 1986-10-17 1988-07-20 Mitsubishi Electric Corp Thermal overcurrent protective relay

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1399401A (en) * 1972-01-11 1975-07-02 Cutler Hammer Inc Electric switches
GB1398302A (en) * 1972-01-25 1975-06-18 Sangamo Weston Electric switching devices
US3792401A (en) * 1972-06-29 1974-02-12 Westinghouse Electric Corp Thermally responsive electrical device
DE2914775B1 (en) * 1979-04-11 1980-07-17 Siemens Ag Device for changing over a changeover contact arrangement
CH662211A5 (en) * 1982-03-22 1987-09-15 Sprecher & Schuh Ag METHOD FOR PRODUCING A MULTI-PHASE THERMAL TRIGGER AND A TRIGGER PRODUCED BY THIS METHOD.
DD206022A1 (en) * 1982-05-19 1984-01-11 Lothar Schliesser SWITCHING MECHANISM FOR THERMAL OVERHEAD RELAYS
DE3401901A1 (en) * 1984-01-20 1985-08-01 Brown, Boveri & Cie Ag, 6800 Mannheim Thermal overcurrent relay having an adjusting eccentric
DE3415226A1 (en) * 1984-04-21 1985-10-31 Brown, Boveri & Cie Ag, 6800 Mannheim THERMAL OVERCURRENT RELAY WITH ADJUSTMENT BRACKET
DE3573862D1 (en) * 1984-06-06 1989-11-23 Mitsubishi Electric Corp Thermal-type overcurrent relay
JPH0347242Y2 (en) * 1985-03-26 1991-10-08
DE8619694U1 (en) * 1986-07-23 1986-09-18 Siemens AG, 1000 Berlin und 8000 München Overload relay
KR900007372B1 (en) * 1986-11-26 1990-10-08 미쓰비시뎅끼 가부시끼가이샤 Thermal over current protective relay
JP4978681B2 (en) * 2009-10-23 2012-07-18 富士電機機器制御株式会社 Thermal overload relay
CN107749382B (en) * 2017-11-16 2021-01-05 浙江人民电器有限公司 Operation structure of circuit breaker, circuit breaker and control method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1043750B (en) * 1954-05-26 1958-11-13 Vacuumschmelze Ag Thermal bimetals
US3015007A (en) * 1959-11-19 1961-12-26 Gen Electric Canada Thermal device
US3257526A (en) * 1962-06-21 1966-06-21 Westinghouse Electric Corp Control device with improved thermal operating means
DE1199868B (en) * 1964-07-23 1965-09-02 Schiele Verwaltungsgmbh Thermal relay for protection against overcurrent and single-phase operation
DE1463086C3 (en) * 1965-06-12 1974-04-25 Danfoss A/S, Nordborg (Daenemark) Thermal overcurrent and phase failure protection relay

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199990A (en) * 1986-10-17 1988-07-20 Mitsubishi Electric Corp Thermal overcurrent protective relay
US4788518A (en) * 1986-10-17 1988-11-29 Mitsubishi Denki Kabushiki Kaisha Thermally-sensitive overcurrent protective relay including wire connection terminal
GB2199990B (en) * 1986-10-17 1991-07-17 Mitsubishi Electric Corp Thermally-sensible overcurrent protective relay including wire connecting terminal

Also Published As

Publication number Publication date
DE1958417A1 (en) 1970-07-30
US3638158A (en) 1972-01-25
FR2023991A1 (en) 1970-08-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee