Abstract: A thermal cutout fuse comprises a housing, a first lead wire thrust into the housing, a movable contact connected to the first lead wire, a stationary contact disposed around the movable contact and electrically connected to a second lead wire, a coil spring having resilient force of bending elasticity large enough to support the movable contact and separate the movable contact from the stationary contact, a thermally sensitive pellet having a melting point which conforms to the preset unsafe temperature and disposed within the housing, and a solid member interposed between the thermally sensitive pellet and the movable contact and adapted to bring the movable contact into contact with the stationary contact against the bending elasticity of the coil spring.

Abstract: A temperature-sensitive switching device is provided in a casing having a pair of leads that extend therefrom, by a spiral spring which forms a first electrical contact and a curved conducting member which forms a second electrical contact. The spiral spring is connected to one of the leads and is expanded and fitted over a thermally-fusible pellet which melts at a predetermined temperature. The outer diameter of the pellet is larger than the inner diameter of the spiral spring contact before it is expanded. The end of the spiral spring contact contains a curved connecting projection, which preferably forms a circular arc, that serves as a sliding contact. The other contact element is provided by a matching fixed curved conducting projection which is connected to the other lead.