GB690772A - Improvements in current-responsive thermally-tripped electrical switches - Google Patents

Improvements in current-responsive thermally-tripped electrical switches

Info

Publication number
GB690772A
GB690772A GB3923/51A GB392351A GB690772A GB 690772 A GB690772 A GB 690772A GB 3923/51 A GB3923/51 A GB 3923/51A GB 392351 A GB392351 A GB 392351A GB 690772 A GB690772 A GB 690772A
Authority
GB
United Kingdom
Prior art keywords
prong
contact
tripped
latch
prongs
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
GB3923/51A
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB690772A publication Critical patent/GB690772A/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

Landscapes

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

Abstract

690,772. Automatic circuit-breakers. GENERAL MOTORS CORPORATION. Feb. 19, 1951 [March 7, 1950], No. 3923/51. Class 38 (v) A thermally-tripped overload-responsive switch comprises a conducting spring arm 22 bifurcated at its free end to provide a pair of prongs 29, 30, the prong 30 carrying a contact 41, and a bimetallic strip 35 having a portion 37 carrying a contact 42 and a portion 40 which acts as a latch for the prong 29. The switch is closed by pressing in a plunger 50 so that an abutment 54 thereon moves the prong 29 up above the latch portion 40, the engagement of the prong 29 with the latch portion 40 holding the switch closed when the plunger is released. The stressing of the spring arm 22 during this movement brings the contact 41 into engagement with the contact 42. Under overload conditions, the current flowing in the bimetallic strip 35 heats it, causing it to deflect outwardly so that the latch portion 40 is moved aside. The prong 29 is released and both prongs 29 and 30 move downwards opening the contacts 41, 42.
GB3923/51A 1950-03-07 1951-02-19 Improvements in current-responsive thermally-tripped electrical switches Expired GB690772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US148172A US2664480A (en) 1950-03-07 1950-03-07 Circuit breaker

Publications (1)

Publication Number Publication Date
GB690772A true GB690772A (en) 1953-04-29

Family

ID=22524610

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3923/51A Expired GB690772A (en) 1950-03-07 1951-02-19 Improvements in current-responsive thermally-tripped electrical switches

Country Status (3)

Country Link
US (1) US2664480A (en)
FR (1) FR1033710A (en)
GB (1) GB690772A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL146606B (en) * 1954-04-28 Beckman Instruments Inc OPTICAL FILTER.
US2866033A (en) * 1955-02-17 1958-12-23 Ambrose P Dillon Electrical outlet connectors
US2866034A (en) * 1955-08-19 1958-12-23 Ambrose P Dillon Electrical outlet receptacles
US2886670A (en) * 1956-05-07 1959-05-12 Ambrose P Dillon Electrical circuit breakers
US3038047A (en) * 1958-03-17 1962-06-05 Littelfuse Inc Ambient temperature compensated circuit breaker
US3234348A (en) * 1960-11-28 1966-02-08 Littelfuse Inc Circuit breaker with ambient temperature compensation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1431220A (en) * 1921-10-28 1922-10-10 Connecticut Telephone & Elec Circuit breaker
DE670790C (en) * 1936-09-23 1939-01-25 Stotz Kontakt Gmbh Thermal self-switch
US2458804A (en) * 1944-02-25 1949-01-11 Sundt Edward Victor Circuit protector
US2490320A (en) * 1946-09-25 1949-12-06 First Ind Corp Method for adjusting spring mechanisms
US2491032A (en) * 1947-02-28 1949-12-13 John T Collins Circuit protector

Also Published As

Publication number Publication date
FR1033710A (en) 1953-07-15
US2664480A (en) 1953-12-29

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