What is a thermal protector?

Thermal protector, also named thermal switch, is a device that is sensitive to temperature or current. It plays a role in control and protection when a thermal overload is caused by temperature or current. Thermal protectors are widely used to control and protect the over temperature of motors, battery packs, coils, compressors, and other electric heating appliances in modern home appliances. 

How does thermal protector work?

The design principle of the Thermal protector switch is to use bimetallic plates to make switches or relays. Two layers of alloys with different thermal expansion coefficients are laminated to form bimetallic plates. The active layer has a large expansion coefficient， whose passive layer is small. When the temperature rises, the bimetal will bend and deform due to the different expansion coefficients of the active layer and the passive layer. When the temperature is restored, the shape of the bimetal will also recover, thus forming a switch that closes and opens according to temperature changes. When installing the thermal protector, it is necessary to ensure that the thermal protector closer to the source of heat.

Features of thermal protector

The bimetallic thermal switch / thermal protector should be able to follow the thermal overload caused by the rapid or slow change of the temperature of the protected device, so it can closely match the thermal characteristics of the protected object and the correct choice can play a role. The thermal protector has the characteristics and advantages of round shape, smaller size, good sealed, stable and reliable performance, easy installation, and competitive price.