RS217(DR1-1) Single Phase Din Rail Electronic Energy Meter is a kind of new style single phase two wire active energy meter. It adopts micro-electronics technique,imports large scale integrated circuit, and uses advanced technique of digital and SMT techniques,etc.It conforms to the standards of IEC62052-11:2003 and IEC62053-21:2003. It can accurately and directly measure 50Hz or60Hz active energy consumption from single phase a.c.electricity grid. It has following features: good reliability, small volume, lightweight, nice appearance, convenient installation, etc.