... series 3-phase True Effective Value Energy Meter(RMS)DW/MDW 3-line LED display 1) Input:true value single/three phase ... input isolation among phases,single/three phase three-wire three- factors,three-phase three wire two factors, three phase four-wire selectable.3) ... distribution,building automation,eg.,single/three phase,voltage/current/power,three phase voltage/ampere integrated display control ...