1. Thermostat, according to the temperature change of working environment, has physical deformation inside the switch, which produces some special effects, and produces a series of automatic control elements that turn on or off, also known as temperature control switch, temperature protector and temperature controller, referred to as temperature controller. Or the temperature is transmitted to the temperature controller through the temperature protector, and the temperature controller sends the switching command, so as to control the operation of the equipment to achieve the ideal temperature and energy saving effect. Its application scope is very wide. According to different kinds of temperature controllers, they are applied in many products such as household appliances, motors, refrigeration or heating.

2. Its working principle is to automatically sample and monitor the environmental temperature by temperature sensor. When the environmental temperature is higher than the control set value, the control circuit can be started, and the control backlash can be set. If the temperature is still rising, when the alarm temperature point is set to set, the overrun alarm function will be activated. When the controlled temperature can not be effectively controlled, in order to prevent the destruction of the equipment, the function of tripping can also be used to stop the equipment from running. It is mainly used in various high and low voltage switchgear, dry transformer, box substation and other related temperature application fields.