The disc bimetal in thermostat can act as sensing thermal element. When heating, the disc suddenly snaps at certain temperature, makes contact action;

When cooling, the disc suddenly snaps to reset condition, make contact recovery, to arrive on-off circuit. It has the features of small size, light weight, no-arcing, high reliability, long life.

These products are widely used in welder, electrical kettles as temperature controler and it has TUV certificate.