Temperature-sensitive relay

摘要

A temperature-sensitive relay is provided with a resilient, movable cantilever composed of amorphous ferromagnetic material having a Curie point. The cantilever is adapted to carry a first contact member. A second contact member is disposed adjacent the first contact member for at least intermittently establishing electrical contact with the first contact member. The relay is adapted to be connected to circuitry having a power source for providing an electrical current and a switching mechanism for activating the circuitry in response to a preselected condition. A magnet is associated with and adapted to bias the cantilever to a first position that interrupts electrical continuity between the first and second contact members. The cantilever is transformed from a ferromagnetic phase to a paramagnetic phase when its temperature exceeds the Curie point, whereby the cantilever assumes a second position in which the electrical continuity is established. A heating means is connected to the circuitry and disposed in the vicinity of the cantilever for heating the cantilever to effect the transformation during a preselected time interval following activation of the circuitry. The relay is lightweight, compact, economical to manufacture and reliable in operation.