It can be used for automatic control of power consumption in hotels, dormitories, factory dormitories and civil buildings on construction sites as well as in prescribed power places. The main reason is to restrict the illegal use of resistive load power electric heating equipment (such as electric stove, hot spot) and so on. It has no effect on the use of computers, electric fans, ordinary instruments, TV sets, incandescent lamps, electronic fluorescent lamps, etc. Therefore, it can restrict the waste of electricity, especially the fire caused by overcurrent heating on the line, which can help eliminate the hidden danger of safety.