... quality 2.long life using 3.No-combustible plastic material three phase energy meter1.good quality2.long life using3.No-combustible ... frequency 50Hz or 60Hz, DT862, DT864, DS862 and DS864 series are the three-phase active energy watt -hour meters, and DX862, DX864 ... , DX865 and DX863 series are threephase reactiveenergy watt-hour meters. ...