Thermal switch

Details Thermal switch Thermal switch

H - Electricity

01

H

H01H 37/54 (2006.01) H01H 37/32 (2006.01) H01H 37/52 (2006.01) H01H 71/14 (2006.01) H01M 2/34 (2006.01) H02H 7/18 (2006.01)

Patent

CA 2254202

A thermal switch assembly includes a dielectric spacer and a switch blade member of shape memory metal sandwiched between a pair of flat metal plates. The spacer provides a cavity between the plates, and the switch blade member has a switch blade portion projecting into the cavity. The switch blade member has a mounting portion engaging one of the metal plates, and the switch blade portion normally is under bending stress in engagement with the other metal plate to provide a current path between the plates. At elevated temperatures, the switch blade portion of shape memory metal moves out of engagement with the other metal plate to interrupt the current path. Fasteners integral with the dielectric spacer cooperate with the metal plates and the switch blade member to hold the switch assembly together with the spacer and the mounting portion of the switch blade member compressively sandwiched between the metal plates.

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