GB571081A - Improvements in and relating to electric current limiting fuses - Google Patents

Improvements in and relating to electric current limiting fuses

Info

Publication number
GB571081A
GB571081A GB17784/43A GB1778443A GB571081A GB 571081 A GB571081 A GB 571081A GB 17784/43 A GB17784/43 A GB 17784/43A GB 1778443 A GB1778443 A GB 1778443A GB 571081 A GB571081 A GB 571081A
Authority
GB
United Kingdom
Prior art keywords
fuse
voltage
oct
granular material
zones
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
GB17784/43A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB571081A publication Critical patent/GB571081A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/18—Casing fillings, e.g. powder

Landscapes

  • Fuses (AREA)

Abstract

571,081. Fusible cut-outs. BRITISH THOMSON-HOUSTON CO., Ltd. Oct. 28, 1943, No. 17784. Convention date, Oct. 31, 1942. [Class 38 (i)] The fusible element of a high-voltage fuse surrounded by an inert granular material, passes through zones in which the granular material is of different grain size in order that the sudden reduction of current due to the action of the fuse is modified and consequential voltage surges controlled. The fuse element 16 may be wound on a ribbed core 13 and the surrounding space'within the casing 10 is divided by radial partitions 20 so that coarse sand or quartz granules 21 and powder 22 are in contact with successive lengths of the element 16. Portions of the fuse are enclosed in ceramic beads 17 to prevent heat radiation and localize the initial fusing. When the whole fuse melts, the coarse material 21 forms a continuous fused tube, while the fine material 22 fuses into globules, the alternate zones producing a stepped voltage gradient along the discharge path and preventing the sudden increase of resistance that would produce a voltage surge. In alternative constructions, the two grades of filling material are separated by transverse partitions by passing the fuse through several separate tubes as described in Specification 499,254. Specification 528,629 also is referred to.
GB17784/43A 1942-10-31 1943-10-28 Improvements in and relating to electric current limiting fuses Expired GB571081A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US464054A US2382271A (en) 1942-10-31 1942-10-31 Current limiting fuse

Publications (1)

Publication Number Publication Date
GB571081A true GB571081A (en) 1945-08-07

Family

ID=23842353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17784/43A Expired GB571081A (en) 1942-10-31 1943-10-28 Improvements in and relating to electric current limiting fuses

Country Status (2)

Country Link
US (1) US2382271A (en)
GB (1) GB571081A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962999C (en) * 1951-05-17 1957-05-02 Chase Shawmut Co High-performance fuse of the current-limiting type
FR2813992A1 (en) * 2000-09-14 2002-03-15 Ferraz Shawmut Protective fuse, for electrical appliances, incorporates fusible element surrounded by two-zone inert packing

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439674A (en) * 1944-10-17 1948-04-13 Gen Electric Current limiting fuse
US3213242A (en) * 1962-02-23 1965-10-19 Westinghouse Electric Corp Current limiting fuse
US3777297A (en) * 1972-10-27 1973-12-04 Chase Shawmut Co Electric fuse for elevated circuit voltages
US3949342A (en) * 1975-04-07 1976-04-06 The Chase-Shawmut Company Electric fuse for elevated circuit voltages
US20080122571A1 (en) * 2006-11-28 2008-05-29 Emerson Electric Co. Fulgurite reducing fuse
US20160064173A1 (en) * 2014-08-26 2016-03-03 Cooper Technologies Company Fuse for high-voltage applications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962999C (en) * 1951-05-17 1957-05-02 Chase Shawmut Co High-performance fuse of the current-limiting type
FR2813992A1 (en) * 2000-09-14 2002-03-15 Ferraz Shawmut Protective fuse, for electrical appliances, incorporates fusible element surrounded by two-zone inert packing

Also Published As

Publication number Publication date
US2382271A (en) 1945-08-14

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