Electric fuse having terminal caps and blades projecting through

Details Electric fuse having terminal caps and blades projecting through Electric fuse having terminal caps and blades projecting through

1981-03-11

1982-06-29

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337252, H01H 8516

Patent

active

043374522

ABSTRACT:
A blade type fuse whose blades project through the end surfaces of the caps which close the tubular casing. Thus the blade contacts project from the outside of the casing into the inside thereof. There are a plurality of fusible elements inside the casing, all having substantially the same resistance. Some of the fusible elements inside the casing that interconnect the aforementioned blade contacts have a relatively small spacing from the plane defined by the pair of blade contacts. Others of the fusible elements that interconnect the aforementioned blade contacts have a relatively large spacing from the plane defined by the pair of blade contacts. All fusible elements are approximately equally distributed across the cross-section of the casing. This involves for some of the fusible elements a relatively large, and for others of the fusible elements a relatively small, spacing from the plane of the blade contacts to which their ends are attached. To compensate for this difference in spacing the resistance of the connector means is approximately inversely proportional to the spacing of the fusible elements from the plane defined by the pair of blade contacts. Thus the resistance of all fusible elements is equalized, irrespective of their position across the cross-section of the casing of the fuse.

REFERENCES:
patent: 3465275 (1969-09-01), Swain
patent: 4245208 (1981-01-01), Belcher
patent: 4254394 (1981-03-01), Kozacka

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