Time lag electrical fuse

Details Time lag electrical fuse Time lag electrical fuse

H - Electricity

01

H

306/170

H01H 85/04 (2006.01) H01H 85/045 (2006.01) H01H 85/00 (2006.01)

Patent

CA 1253543

TIME LAG ELECTRICAL FUSE Abstract of the Disclosure A composite time lag fuse having an insulating housing enclosing a time delay fuse and an electrical resistance heater which is located in intimate heat transfer relationship with the time delay fuse. The time delay fuse and electrical resistance heater being connected in a series circuit between a pair of conductive end caps closing the ends of the insulating housing. An overload current flow in the electrical resistance heater resulting in the generation and transfer of heat from the electrical resistance heater to the time delay fuse to cause the time delay fuse to interrupt after a predetermined time delay, an overload current flow in the circuit to be interrupted, which is of a lesser magnitude than would otherwise be interrupted by the time delay fuse. For improved short circuit performance, a short circuit fuse is also enclosed in the insulating housing and is connected in the series circuit.

520706

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