The thermoswitches can be supplied in plastic or ceramic enclosures. The temperature coupling is achieved via a bimetallic washer positioned directly under the metal cap. In the types: temperature monitor, controller with an normally closed (NC) contact (KO, CO) or normally open (NO) contact system (KS, CS) the switching takes place automatically, depending on the temperature, within the switching temperature range between -25°C and 390°C.