Thermal protector is a kind of over temperature and over current protector produced by proprietary technology. It has small volume, large contact capacity, fast trip action and reliable performance. It is a miniature, fast-moving, thermal device. In the field of thermal protection technology, it is a widely used protection element. Thermal protector When the electrical appliance does not work normally, the current increases and the surrounding temperature rises, and the temperature setting value of the thermal protector is exceeded, the circuit is automatically disconnected, so that the electrical appliance is protected. When the device is cooled to a safe temperature, the contact can be automatically closed. The thermal protector also has the effect of overcurrent protection: when the circuit is short circuited or the motor is blocked, the thermal effect on the bimetal sheet is generated due to the rapid increase of current, so that the thermal sensing sheet uses the torque principle to quickly cut off the current contact point.