GB740282A - Improvements in or relating to thermally operated protective devices for polyphase circuits - Google Patents

Improvements in or relating to thermally operated protective devices for polyphase circuits

Info

Publication number
GB740282A
GB740282A GB18273/53A GB1827353A GB740282A GB 740282 A GB740282 A GB 740282A GB 18273/53 A GB18273/53 A GB 18273/53A GB 1827353 A GB1827353 A GB 1827353A GB 740282 A GB740282 A GB 740282A
Authority
GB
United Kingdom
Prior art keywords
elements
levers
thermal
strip
plate
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
GB18273/53A
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of GB740282A publication Critical patent/GB740282A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

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

Abstract

740,282. Thermal switches; protective cut-out arrangements. TELEMECANIQUE ELECTRIQUE. July 1, 1953 [July 18, 1952], No. 18273/53. Class 38(5) A thermal device for protecting a polyphase circuit comprises a number of thermal elements, one per phase, acting on a common switch control member, in the event of overloading or failure or underloading of one or more, but not all, phases, by means of levers pivoted to the elements. As shown applied to a threephase system, bimetal elements B1, B2, B3 are secured at points S1, E1 &c. and are heated by current through them or by surrounding coils. Each of the elements B1, B3 carries a lever L1 or L3 which rests on an insulating strip T2 secured to the central strip B2. Similarly, the latter carries levers L2, L<SP>1</SP>2 bearing respectively on strips T1, T2 attached to elements B1 B3. On a balanced overload, all of the elements deflect upwards and tilt a plate 2 about pivots 4 to separate control contacts 6, 7. If one phase fails, the corresponding element, e.g. B1 bends downwards causing lever L1 to pivot on strip T2 about a projection A1, raising plate 2 and opening the contacts. If the centre phase fails, element B2 deflects downwards and levers L2 and L'2 raise plate 2.
GB18273/53A 1952-07-18 1953-07-01 Improvements in or relating to thermally operated protective devices for polyphase circuits Expired GB740282A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1003331X 1952-07-18

Publications (1)

Publication Number Publication Date
GB740282A true GB740282A (en) 1955-11-09

Family

ID=9562908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18273/53A Expired GB740282A (en) 1952-07-18 1953-07-01 Improvements in or relating to thermally operated protective devices for polyphase circuits

Country Status (5)

Country Link
US (1) US2713623A (en)
BE (1) BE521499A (en)
DE (1) DE1003331B (en)
FR (1) FR1060403A (en)
GB (1) GB740282A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265831A (en) * 1962-06-21 1966-08-09 Westinghouse Electric Corp Thermally responsive electrical control device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866035A (en) * 1955-02-17 1958-12-23 C T Electrical Controls Ltd Thermally operated electric switching mechanisms
BE549732A (en) * 1955-07-21
DE1014636B (en) * 1955-11-26 1957-08-29 Voigt & Haeffner Ag Arrangement for switches and relays in multi-phase alternating current circuits to actuate a trip device
US2964602A (en) * 1956-04-02 1960-12-13 Joe Davidson Snap acting mechanism
NL104154C (en) * 1957-05-03
DE1051952B (en) * 1957-08-06 1959-03-05 Siemens Ag Gear for bimetal overcurrent release
US3743992A (en) * 1972-08-04 1973-07-03 Westinghouse Electric Corp Thermally responsive electrical control device for polyphase currents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652527A (en) * 1924-11-08 1927-12-13 Westinghouse Electric & Mfg Co Protective device
US2177775A (en) * 1936-07-25 1939-10-31 Square D Co Circuit breaker
GB624957A (en) * 1947-07-17 1949-06-20 British Thomson Houston Co Ltd Improvements in and relating to current sensitive devices for the protection of polyphase circuits
BE488162A (en) * 1948-05-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265831A (en) * 1962-06-21 1966-08-09 Westinghouse Electric Corp Thermally responsive electrical control device

Also Published As

Publication number Publication date
DE1003331B (en) 1957-02-28
BE521499A (en)
FR1060403A (en) 1954-04-01
US2713623A (en) 1955-07-19

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