Non-resettable thermal fuse

Abstract From the Canadian patent

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 …