Non-resettable thermal fuse

Details Non-resettable thermal fuse Non-resettable thermal fuse

H - Electricity

01

H

306/136

H01H 85/36 (2006.01) H01H 37/76 (2006.01)

Patent

CA 1196364

ABSTRACT OF THE DISCLOSURE Two wire leads project from opposite ends of a dielectric housing having a sealed chamber containing a fusible metal alloy link, which operatively connects the wire leads electrically to one another. A flexible, pre-loaded, dielectric spring element in the chamber engages and exerts upon the link a predetermined stress, which is operative to cause the link suddenly to fail and interrupt the connection between the leads, when the ambient temperature of the link exceeds a predetermined temperature range. In one embodiment the two wire leads project into the chamber and have spaced, confronting ends interconnected by the link, one side of which is held under compressive stress by the spring element. In a second embodiment a sinuous spring element is formed on one end of one lead, and extends into the chamber where its free end is soldered under tension to one wall of the chamber in electrical contact with the second lead wire, so that when the link melts the tensioned spring element is dis- connected from the second lead wire.

423086

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