... and displays real time AC phase voltage, line voltage, and current with LED display in 3P3W or 3P4W network. It ... voltage/current measurement device.Model DescriptionYD9120:3 phase current, voltage input, 4 bits display,YD9121:3 phase current, voltage input, 4 bits ... 1.5VA, 2. AC85~265V or DC85~330V(Customized)Working frequency withstand voltage: Between power supply/input /output: AC2kV/min·1mA ...