GB916299A - Improvements in electric circuit breakers - Google Patents

Improvements in electric circuit breakers

Info

Publication number
GB916299A
GB916299A GB43802/61A GB4380261A GB916299A GB 916299 A GB916299 A GB 916299A GB 43802/61 A GB43802/61 A GB 43802/61A GB 4380261 A GB4380261 A GB 4380261A GB 916299 A GB916299 A GB 916299A
Authority
GB
United Kingdom
Prior art keywords
frame
armature
circuit
polepiece
breaker
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
GB43802/61A
Inventor
Edward Coleman
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.)
JA Crabtree and Co Ltd
Original Assignee
JA Crabtree and Co Ltd
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 JA Crabtree and Co Ltd filed Critical JA Crabtree and Co Ltd
Priority to GB43802/61A priority Critical patent/GB916299A/en
Priority to DEC26957A priority patent/DE1199865B/en
Publication of GB916299A publication Critical patent/GB916299A/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
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Landscapes

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

Abstract

916,299. Automatic circuit-breakers. CRABTREE & CO. Ltd., J. A. May 25, 1960 [April 2, 1960], No. 43802/61. Divided out of 905,639. Class 38 (5). In a moulded-case circuit-breaker having overload-responsive electromagnetically-tripped mechanism, such as that of Specification 905,639, the magnet frame is reduced in crosssectional area in the vicinity of the armature to provide an additional shortened path of high reluctance to ensure operation under shortcircuit conditions. In the circuit-breaker shown, overload current through the coil 16 causes a magnetic plunger 6 to be pulled towards a polepiece 18 with a time delay. An air gap 15x between the polepiece 18 and the end of the magnet frame 13 ensures that the flux produced by the coil 16 passes through a path provided by the plunger 6, the polepiece 18, the armature 15, the frame 13 and a sleeve 12 causing the armature to be attracted and the circuitbreaker to be tripped. The frame 13 is provided with a hole 13x to produce a highreluctance portion so that when a short-circuit occurs and instantaneous tripping is required a shortened flux path exists from the reduced end of the plunger 6 (in the position shown) across to the portion of the frame 13 between the hole 13x and the gap 15x, thence to the armature 15, the frame 13 and the sleeve 12, so that the armature 15 is attracted to cause tripping of the circuit - breaker. Specifications 905,640 and 905,641 also are referred to.
GB43802/61A 1960-04-02 1960-04-02 Improvements in electric circuit breakers Expired GB916299A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB43802/61A GB916299A (en) 1960-04-02 1960-04-02 Improvements in electric circuit breakers
DEC26957A DE1199865B (en) 1960-04-02 1960-06-01 Electric circuit breaker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB43802/61A GB916299A (en) 1960-04-02 1960-04-02 Improvements in electric circuit breakers
DEC26957A DE1199865B (en) 1960-04-02 1960-06-01 Electric circuit breaker

Publications (1)

Publication Number Publication Date
GB916299A true GB916299A (en) 1963-01-23

Family

ID=35197675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43802/61A Expired GB916299A (en) 1960-04-02 1960-04-02 Improvements in electric circuit breakers

Country Status (2)

Country Link
DE (1) DE1199865B (en)
GB (1) GB916299A (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH121430A (en) * 1926-06-26 1927-08-01 Gfeller Ag Automatic electrical momentary and time switch.
FR839053A (en) * 1937-12-02 1939-03-23 Alsthom Cgee Method and devices for facilitating the modification of the operating conditions of electric circuit breakers and other apparatus which are to operate automatically when certain conditions occur
CH259582A (en) * 1944-02-12 1949-01-31 Huber & Cie Ag J Electrical switchgear with overcurrent protection.
CH245200A (en) * 1945-07-27 1946-10-31 Bbc Brown Boveri & Cie Combined thermal and dynamic release.
CH268666A (en) * 1947-05-17 1950-05-31 Westinghouse Electric Corp Electromagnetic release device on electrical switches.
US2840663A (en) * 1954-05-05 1958-06-24 Westinghouse Electric Corp Circuit breaker
DE1024155B (en) * 1955-10-08 1958-02-13 Voigt & Haeffner Ag Electromagnetic release for direct and alternating current

Also Published As

Publication number Publication date
DE1199865B (en) 1965-09-02

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