The thermostat is made according to the principle of thermal expansion and contraction of objects. Thermal expansion and contraction are common to objects, but different objects have different degrees of thermal expansion and contraction. The two sides of the double gold piece are conductors of different materials. Under the changing temperature, the double gold piece is bent due to the different degree of expansion and contraction. When it touches the set contact or switch, the set circuit (protection) starts to work.

      This is the basic working principle and production ideas of the thermostat.