Main parts

1) Ceramic cover plate  2) Stationary silver contact  3) Shaft pin 

4) Bimetal disc   5) Spring disc  6) Movable contact  7) Housing

Construction

Stationary silver contact and ceramic covers are riveted together; The movable contact, bimetal disc and spring disc are riveted together by shaft pins. The movable contact is in close contact with the stationary silver contact under the pre-pressure of the spring disc; The current passes through the stationary silver contact and the movable contact to form a loop.