... 1.Features of DW9 three phase power meter : - Multi-function coulo-meter. - Measuring object: voltage, current, power, power consumption, power factor, frequency, active ... capacity: AC 250V/3A or DC 30V/3A. - With analog 4~20mA output. - With RS485 communiation interface, modubus RTU protocol. - Power supply ... us! IBEST ELECTRICAL CO.LTD IBEST DW9 Three phase Power meter , With RS485 Interface Power ...