Up to 4 three-phase circuits can be monitored for various electrical parameters such as voltage and current, as well as active and reactive energy. Wall mounted fixed installation or standard DIN rail installation with lead sealable wiring protection cover to prevent arbitrary changes in wiring. Industrial grade crimping type wiring terminals are used for reliable connection and long-term reliable operation. Black and white dot matrix LCD is used for display, which can simultaneously display multi-channel measurement parameters, making it convenient to intuitively select rated current 3 * 1.5 (6) A, and convenient to install/5A standard current transformers. The wiring method is flexible. It is suitable for power distribution metering in new facilities and can also be used for the renovation of old power distribution systems. It is suitable for use in large commercial facilities, apartments, dormitories, industrial enterprises, and residential areas.