GB865144A - Integrated moulded case circuit breaker current-limiting fuse units - Google Patents

Integrated moulded case circuit breaker current-limiting fuse units

Info

Publication number
GB865144A
GB865144A GB25571/57A GB2557157A GB865144A GB 865144 A GB865144 A GB 865144A GB 25571/57 A GB25571/57 A GB 25571/57A GB 2557157 A GB2557157 A GB 2557157A GB 865144 A GB865144 A GB 865144A
Authority
GB
United Kingdom
Prior art keywords
fuses
breaker
latch
pivoted
casings
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
GB25571/57A
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.)
Chase Shawmut Co
Original Assignee
Chase Shawmut 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 Chase Shawmut Co filed Critical Chase Shawmut Co
Publication of GB865144A publication Critical patent/GB865144A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • 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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker

Landscapes

  • Fuses (AREA)
  • Breakers (AREA)

Abstract

865,144. Automatic circuit - breakers. CHASE-SHAWMUT CO. Aug. 13, 1957 [Aug. 13, 1956], No. 25571/57. Class 38 (5). [Also in Group XXXVI] Current-limiting back-up fuses in circuitbreakers are made with synthetic resin-glass cloth laminate casings which would normally be damaged by the thermal effects of small overloads, but the circuit-breaker overload device operates before such overloads can damage the fuse casings. The theory underlying the invention is described in detail with the aid of graphs (Figs. 1 to 5, not shown). As shown in Figs. 6 and 7 the breaker and fuses are mounted in a moulded case 1 and cover 2 having channels 1b for the breaker poles and partitions 1k separating the poles and fuses. The latter are in parallel with resistors 45 which allow sufficient current to flow to trip the breaker after the fuse has blown. The moving contacts 7 are carried on arms 5 pivoted at 20 and coupled together by an insulating bar 18. Manual operation is effected by movement of a handle 10 which causes a tension-spring 24 to move the centre pivot 23 of toggle links 21, 22 to open or close the contacts. The link 21 is pivoted at 25<SP>1</SP> on a latch 26 pivoted at 27 and normally held by a bar 29 which can be rotated, to release the latch 26 and trip the breaker, by a sleeve 40 under the action of an armature 37 or a second latch 43 pivoted at 43<SP>1</SP>. The armature 37 is acted upon by laminations 36 surrounding the main conductor 30 and the latch is acted upon by a spring 44 when it is released by a bimetal strip 33. The fuse casing may be melamine-glasscloth laminate. Fuses in casings according to the invention are stated to be smaller than normal fuses whose casings have to withstand the full thermal effects of currents in accordance with their fusing characteristics.
GB25571/57A 1956-08-13 1957-08-13 Integrated moulded case circuit breaker current-limiting fuse units Expired GB865144A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US603734A US2919328A (en) 1956-08-13 1956-08-13 Integrated molded case circuit breaker current-limiting fuse units

Publications (1)

Publication Number Publication Date
GB865144A true GB865144A (en) 1961-04-12

Family

ID=24416696

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25571/57A Expired GB865144A (en) 1956-08-13 1957-08-13 Integrated moulded case circuit breaker current-limiting fuse units

Country Status (2)

Country Link
US (1) US2919328A (en)
GB (1) GB865144A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070728A (en) * 1957-08-16 1962-12-25 Ite Circuit Breaker Ltd Selective trip arrangement utilizing circuit breakers which are coordinated with current limiting fuses
US3116385A (en) * 1961-01-23 1963-12-31 Ite Circuit Breaker Ltd Circuit connection for circuit breakers having current limiting fuses
US3171926A (en) * 1961-03-10 1965-03-02 Ite Circuit Breaker Ltd Circuit breaker having a first plurality of series connecnted fuses and a second plurality of fuses in parallel therewith
US3836820A (en) * 1973-03-01 1974-09-17 Ite Imperial Corp Manual motor starter combined with fused circuit protectors
JPS5840750Y2 (en) * 1978-08-08 1983-09-13 三菱電機株式会社 Power cutoff device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140360A (en) * 1933-10-31 1938-12-13 Westinghouse Electric & Mfg Co Circuit interrupter
US2358215A (en) * 1942-01-29 1944-09-12 Gen Electric Protective system
US2416951A (en) * 1942-09-26 1947-03-04 Gen Electric Switching means
GB562272A (en) * 1942-11-13 1944-06-26 Electric Transmission Ltd Improvements in or relating to electric cut-outs embodying fusible elements
US2662140A (en) * 1952-08-15 1953-12-08 Chase Shawmut Co Supercurrent fuse
US2843702A (en) * 1952-10-22 1958-07-15 Ite Circuit Breaker Ltd Protective device with current limiting means
US2809257A (en) * 1954-10-04 1957-10-08 Chase Shawmut Co Composite fuse links of silver and copper
US2800556A (en) * 1955-09-09 1957-07-23 Chase Shawmut Co Fuse structures

Also Published As

Publication number Publication date
US2919328A (en) 1959-12-29

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