A circuit protector and method of making a circuit protector

Details A circuit protector and method of making a circuit protector A circuit protector and method of making a circuit protector

H - Electricity

01

H

H01H 85/041 (2006.01) H01H 69/02 (2006.01) H01H 85/047 (2006.01) H01H 85/143 (2006.01) H01H 85/42 (2006.01) H01H 85/00 (2006.01) H01H 85/046 (2006.01)

Patent

CA 2145972

A subminiature circuit protector includes a substrate carrying a metal fuse element hermetically sealed in a glass sleeve cartridge. The fuse element may comprise a film deposited on the substrate, or, alternatively a metal strip or wire. Leads extend from opposing ends of the sleeve for connection in a circuit, and a gas is sealed in the sleeve to provide a suitable environment to improve operating lifetime and interrupting capability. A method for making a circuit protector includes placing a substrate carrying a fuse element in a glass sleeve and placing leads in contact with the fuse element. The assembly is heated in the presence of a gas below atmospheric pressure to a temperature sufficient to soften the glass. The pressure is then increased to cause the ends of the glass sleeve to form a hermetic seal about the leads.

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