... 3-phase power meters detailed description:3-phase Digital Network Panel Meter LED display voltage, current, power, frequency, power factor, kWh, DI/ DO ... RateSupport 4800bps and 9600bpsProtocolStandard Modbus-RTUInsulation Strength2KV(testing voltage is AC valid value)Insulation Resistance≥ 50MΩMTBF≥ 50000hOperating EnvironmentOperating Temperature:-20 ...