Electric fuse having gas-evolving means for limiting burnback

H - Electricity – 01 – H

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H01H 85/42 (2006.01) H01H 85/18 (2006.01)

Patent

CA 1155157

ELECTRIC FUSE HAVING GAS EVOLVING MEANS FOR LIMITING BURNBACK Abstract of Disclosure 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 inter- ruption of a major fault current. -1-

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