Model DEM031CL single phase electronic multi-rate DIN rail active energy meter is a kind of single phase two wire two tariffs (tariff conversion is controlled by timer outside or similar equipment) active energy meter. The meter completely accord with relevant technical requirements of class 1 single phase active energy meter stipulated in international standard IEC 62053-21. It can accurate and directly measure 50Hz or 60Hz active energy consumption from single phase AC electricity net. This meter has seven digits LCD displays shows various consumption data and information. It has following features: good reliability, small volume, light weight, specious nice appearance, convenient installation, etc. This meter has already got the patent certificate from China State Intellectual Property Office at present. Patent certificate NO. ZL 2006 3 0106828.1, any other country patent certificate are in assessing.