GB1476870A - Fuse element - Google Patents

Fuse element

Info

Publication number
GB1476870A
GB1476870A GB2108875A GB2108875A GB1476870A GB 1476870 A GB1476870 A GB 1476870A GB 2108875 A GB2108875 A GB 2108875A GB 2108875 A GB2108875 A GB 2108875A GB 1476870 A GB1476870 A GB 1476870A
Authority
GB
United Kingdom
Prior art keywords
trough
zone
reduced
alloy
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
GB2108875A
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.)
Dorman Smith Fuses Ltd
Original Assignee
Dorman Smith Fuses 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 Dorman Smith Fuses Ltd filed Critical Dorman Smith Fuses Ltd
Priority to GB2108875A priority Critical patent/GB1476870A/en
Priority to CA252,685A priority patent/CA1038427A/en
Publication of GB1476870A publication Critical patent/GB1476870A/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
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/10—Fusible members characterised by the shape or form of the fusible member with constriction for localised fusing

Landscapes

  • Fuses (AREA)

Abstract

1476870 Fuses DORMAN SMITH FUSES Ltd 29 April 1976 [17 May 1975] 21088/75 Heading H2G A fuse element comprises a metal strip made of for example silver or copper formed with a trough containing a low melting point metal, for example tin or tin/lead alloy, wherein the strip is reduced in section, to create a zone of relatively high resistance, immediately adjacent the trough. As shown the high resistance zones 13 are formed by forming notches. Further notched zones 15, 16 are provided further from the trough. A cartridge fuse (Fig. 3) may contain one or more elements 17 disposed in a ceramic tube 18 filled with arc-quenching silica sand 19, the tube being closed at each end by a pair of end caps 20, 21, enclosing an asbestos disc. Various modifications of the element are disclosed including forming the zone of reduced section by providing holes (Figs. 7 and 8, not shown), or a surface channel (Figs. 9 and 10, not shown). The trough may be rectangular (Figs. 11 and 12, not shown), and the alloy may be a rod in a semicircular trough (Figs. 13 and 14, not shown). In a further modification a reduced-section zone is bounded by a pair of troughs (Figs. 15 and 16, not shown). The arrangement provides for short-time current surges to be withstood, the heat developed in the reduced zone melting the alloy and thereby delaying fusing, whilst more persistent overloads melt the fuse. The remote zones 15, 16, respond to short-circuit overloads
GB2108875A 1975-05-17 1975-05-17 Fuse element Expired GB1476870A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2108875A GB1476870A (en) 1975-05-17 1975-05-17 Fuse element
CA252,685A CA1038427A (en) 1975-05-17 1976-05-17 Fuse element for a cartridge type fuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2108875A GB1476870A (en) 1975-05-17 1975-05-17 Fuse element

Publications (1)

Publication Number Publication Date
GB1476870A true GB1476870A (en) 1977-06-16

Family

ID=10157011

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2108875A Expired GB1476870A (en) 1975-05-17 1975-05-17 Fuse element

Country Status (2)

Country Link
CA (1) CA1038427A (en)
GB (1) GB1476870A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239903A1 (en) * 1981-11-09 1983-05-26 Kombinat Veb Keramische Werke Hermsdorf, Ddr 6530 Hermsdorf Integral melting conductor for electrical fuses
GB2148626A (en) * 1983-10-18 1985-05-30 Marbourn Limited Electrical fuselink

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239903A1 (en) * 1981-11-09 1983-05-26 Kombinat Veb Keramische Werke Hermsdorf, Ddr 6530 Hermsdorf Integral melting conductor for electrical fuses
GB2148626A (en) * 1983-10-18 1985-05-30 Marbourn Limited Electrical fuselink

Also Published As

Publication number Publication date
CA1038427A (en) 1978-09-12

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee