VA series are bimetal thermostat/thermal protector with silver contact. It's compact dimensions and constant temperature(About off-on difference 2C) control design make it exceptionally suitable or electric blanket, heating pad and househould applicance.
1.Use conductive bimetal material to make sure stable currency and the low voltage/current requirment
2.Gradually switch on/off in order to maintain a constant & stable temperature
3.Normally open and closed
4.VAL has extra gluing terminals design to overcome an easy breaking on cooper core after wiring