LEM022SJ has minimum size, and also a new three phase four wire active energy meter. It has already passed the test of the international authority CE. The meter completely accord with relevant technical requirements of class 1 three phase active energy meter stipulated in international standard IEC 62053-21. It can accurately and directly measure 50Hz or 60Hz active energy consumption from three phase AC electricity net. This meter has white backlight source . It has following features: Good reliability, small volume, light weight, specious nice appearance, convenient installation, etc.