The thermostat is made according to the principle of thermal expansion and contraction of objects. Heat expansion and cold contraction are common objects, but the degree of heat expansion and cold contraction of different objects is not the same. The two sides of the double gold sheet are conductors of different substances, which bend the double gold sheet at different temperatures due to different degrees of expansion and contraction, and touch the set contact or switch, so that the set circuit (protection) begins to work.
This is the basic working principle and production ideas of the thermostat.