Main parts

1) Ceramic cover plate 2) Stationary silver contact 3)  Spring disc

4) Movable contact 5) Conductive housing 6) Bimetal disc

Construction

Stationary silver contact are riveted with ceramic cover plate. The movable contact are welded to the spring disc, which is in the shape of a cross, and the four feet are connected to the bottom of the housing. The inner hole of the bimetal disc is placed on the spring disc through the movable contact. The current pass through the stationary silver contact to the movable contact, and then connects the conductive housing through spring discs to form a loop.