Thermal switch

摘要

A thermal switch assembly has a stiffener disc positioned against a support flange that extends inwardly from a peripheral wall of a plastic assembly grommet. An actuator member of shape memory metal is received in a recess in the stiffener disc, and an insulator ring lies against the disc and actuator member on the opposite side of the disc from the support flange. A cap member is positioned against the insulator on the opposite side thereof from the stiffener disc, and a resilient actuator blade on the actuator member extends through a central opening in the insulator into engagement with the cap member. The actuator blade normally completes a circuit between the stiffener disc and the cap member, and automatically disengages from the cap member at an elevated transition temperature to open the circuit.