Abstract: A sensor circuit provides a signal to a microcontroller to indicate parameters of an environmental condition to which the sensor circuit is exposed, such as temperature. The sensor circuit and microcontroller are mounted in a common housing, with an output lead indicating an on/off output based on predetermined parameters of the environmental condition. By access through the output lead, the microcontroller can be reprogrammed to change the predetermined parameters controlling the output state of the switch.

Abstract: A thermostatic switch including a bimetallic disc movable between two oppositely dished configurations with a snap action in response to changes in temperature, and a tapered, resilient contactless arm fixedly attached by an anchored end to the perimeter of the disc and having a movable end. The movable end of the arm is moved with the disc between two positions corresponding to the disc configurations. The arm has a relatively low mass and minimal influence on the thermal operating characteristics of the disc. The thermostatic switch also includes a conductive plate with the disc positioned adjacent to the plate and the arm being in direct electrical contact with the plate when in a first arm position for conducting low current therebetween and being out of electrical contact with the plate when in a second arm position.