Main parts

1) Shell  2) Iron bracket  3) Bimetal disc

4) Movable contact  5) Base  6) Stationary silver contact

Construction

The movable contact are welded to the bimetal sheet and then welded to the iron bracket. The stationary silver contact and base are molded into a whole, and then the base is riveted with the iron bracket. The current first passes through the movable contact on the bimetal disc from the iron bracket, and then passes through the stationary silver contact to form a loop.