GB588144A - An electric overload protective device - Google Patents

An electric overload protective device

Info

Publication number
GB588144A
GB588144A GB15035/44A GB1503544A GB588144A GB 588144 A GB588144 A GB 588144A GB 15035/44 A GB15035/44 A GB 15035/44A GB 1503544 A GB1503544 A GB 1503544A GB 588144 A GB588144 A GB 588144A
Authority
GB
United Kingdom
Prior art keywords
armature
contact
magnetic
pole
overload
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
GB15035/44A
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.)
WILLIAM EARLE STILWELL
Original Assignee
WILLIAM EARLE STILWELL
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 WILLIAM EARLE STILWELL filed Critical WILLIAM EARLE STILWELL
Publication of GB588144A publication Critical patent/GB588144A/en
Expired legal-status Critical Current

Links

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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2445—Electromagnetic mechanisms using a reed switch

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Abstract

588,144. Electromagnetic switches. STILWELL, W. E. Aug. 8, 1944, No. 15035. Convention date, Aug. 12, 1943. [Class 38 (v)] An overload protective device actuated by the increase in magnetic flux round an electrical conductor when the current through the conductor is increased, comprises a magnetic U-shaped strap 11 which receives the conductor 14 and is bent outwards to form poles 12, 13 and a magnetic extension 17 secured to pole 12 and pivotally carrying by means of a rivet 18, an armature 20, one end of which overlies pole 13. A spring 25, the tension of which is varied by screw 26, biasses the armature 20 anti-clockwise so that a contact 24 on the rear end is separated from a fixed contact 23a. A non-magnetic shim 21 spaces the armature from the extension 17. Upon overload, the armature 20 is attracted by pole 13 and moves clockwise with a snap action imparted by a roll-spring 27. Closure of the contacts energises a solenoid which operates a circuitbreaker. In a modification, the contact 24 is arranged on the free end of the armature, the contact 23a being correspondingly moved, so that the contacts are normally closed, and open upon overload, thus de-energising a solenoil and opening a circuit-breaker.
GB15035/44A 1943-08-12 1944-08-08 An electric overload protective device Expired GB588144A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US498273A US2484863A (en) 1943-08-12 1943-08-12 Overload protective device

Publications (1)

Publication Number Publication Date
GB588144A true GB588144A (en) 1947-05-15

Family

ID=23980331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15035/44A Expired GB588144A (en) 1943-08-12 1944-08-08 An electric overload protective device

Country Status (2)

Country Link
US (1) US2484863A (en)
GB (1) GB588144A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144516A (en) * 1991-02-04 1992-09-01 Wing Shing Products Company, Ltd. Leakage current circuit interrupter device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257533A (en) * 1965-04-23 1966-06-21 Westinghouse Electric Corp Fluid-blast circuit interrupters with two selectively-operated fluid-blast sources
NL293041A (en) * 1962-05-24
US3188427A (en) * 1963-02-25 1965-06-08 Gen Electric Electromagnetic current carrying switch
US3240896A (en) * 1963-12-18 1966-03-15 Westinghouse Electric Corp Predetermined current relay for conductors entering a tank
US3270163A (en) * 1965-05-19 1966-08-30 Automatic Switch Co Coil-less relay for use on bus bars
US3569880A (en) * 1968-09-16 1971-03-09 Rucker Co Magnetically operated current sensor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US728752A (en) * 1901-09-12 1903-05-19 Samuel L Naphtaly Electrical distribution.
US890697A (en) * 1905-10-04 1908-06-16 Gen Electric Protective device for unipolar machines.
US850205A (en) * 1906-03-20 1907-04-16 Gen Electric Automatic device for induction-motors.
US1220813A (en) * 1913-01-30 1917-03-27 Gen Electric Protective device for electric distributing systems.
DE401393C (en) * 1922-03-26 1924-09-04 Edmund Schroeder Maximum switch (limit switch) for electrical resistance welding machines
US1983026A (en) * 1928-03-27 1934-12-04 Western Clock Co Accelerator switch for clocks
US1934264A (en) * 1930-12-04 1933-11-07 Hefner Charles Balser Over-current signal means
US1930528A (en) * 1931-02-03 1933-10-17 Westinghouse Electric & Mfg Co Control apparatus
US2075499A (en) * 1936-01-11 1937-03-30 Bell Telephone Labor Inc Switching device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144516A (en) * 1991-02-04 1992-09-01 Wing Shing Products Company, Ltd. Leakage current circuit interrupter device

Also Published As

Publication number Publication date
US2484863A (en) 1949-10-18

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