Electric fuse having gas evolving means for limiting burnback

Details Electric fuse having gas evolving means for limiting burnback Electric fuse having gas evolving means for limiting burnback

1980-09-22

1981-12-22

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337281, H01H 8542

Patent

active

043073689

ABSTRACT:
The process of circuit interruption by an electric fuse can be initiated either by a protracted overload, or by a major fault current of large proportions. This invention is concerned with the latter kind of fault currents.
A substantially U-shaped gas-evolving structure is inserted between parallel rows of fusible elements. The two parallel arms of that structure are positioned close to the terminal elements of the fuse. A tie member interconnecting the two arms is positioned substantially out of the arcing zone and parallel to a generatrix of the fuse casing. On occurrence of a major fault current, the gas evolved from the arms protects the terminal elements of the fuse. It also tends to quench the follow current, i.e. the current which flows through the hot fulgurite after a successful interruption of a major fault current.

REFERENCES:
patent: 2964604 (1960-12-01), Jacobs, Jr. et al.
patent: 4179678 (1979-12-01), Perreault

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