ZWJ-12 power load control metering box (hereinafter referred to as metering box), mainly used for rated voltage 10kV, rated frequency 50Hz, capacity 5000kVA and below power users and substation area, play the role of load control, high voltage electric energy metering. With the load control terminal or other controllers can achieve load control, high voltage metering, high voltage prepaid, overload current protection, anti-theft and other functions.