... 3-line LED display 1) Input:true value single/three phase measure(bandwidth: up to 2.5KHz) more than 32 parameters, ... Features:voltage/ampere ratio set freely, input isolation among phases,single/three phase three-wire three- factors,three-phase three wire ... control of power system,factory power distribution,building automation,eg.,single/three phase,voltage/current/power,three phase voltage/ampere ...