Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1986-11-12
1987-08-25
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, H01H 8504
Patent
active
046895981
ABSTRACT:
An electrical fuse having an element which includes a strip of conductive metal connectable to the fuse terminals, the strip of conductive material having a plurality of holes through its thickness dimension spaced along the center line of its width, successive ones of the holes through the strip each having a slot joining that hole with an opposite one of the edges from the edge joined by the adjacent hole and its associated slot, the spacing of the holes and their associated slots being such that the current flowing through the fuse element is forced to zig-zag through regions which constrict the current and successive regions which have broad area and volume so that undesired abnormally high temperature rises within the fusing element, which might arise with ordinary over-loads which are not destructive and would cause unnecessary opening of the fuse element, are prevented, while, at the same time, the sensitivity of the fuse element to destructive current surges is retained and, if necessary, fusing time in low current regions of operation is enhanced by plating on the surface of the conductive strip a metal of low-melting-point which will form a eutectic with the base material of the strip to reduce the melting temperature of the fuse strip when it is operating in the low current regions and faces a sudden and destructive surge of electrical current, the combination having mechanical strength as well as improved electrical characteristics.
REFERENCES:
patent: 4123738 (1978-10-01), Huber
Ishikawa Hiroshi
Yoshigae Kiyohisa
Birchard Bruce L.
Broome Harold
Fuji Electric & Co., Ltd.
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