This is a cyclic operation temperature sensitive device, which is intended to keep temperature between two particular values under normal operating conditions, automatically switching on or off the electrical circuit. Once the temperature of the bimetal plate has returned to the specified reset temperature, the contacts will automatically return to their original state. Operating temperature of this thermostat is adjusted by rotating the shaft.

This thermostat can be built to either open or close its electrical contacts as the temperature increases.

The current sensitive model of this thermostat is also available. In this case it is also a regulator of energy.

These thermostats are widely used throughout the heating and cooling appliance industry and are designed for smooth regulation of temperature for variety of heating and cooling devices.