... voltage/current measurement device.Model DescriptionYD9120:3 phase current, voltage input, 4 bits display,YD9121:3 phase current, voltage input, 4 ... input, 4 bits display + one relay contact output,YD912A:3 phase current, voltage input, 4 bits display +one RS485 + ... 100A Accuracy: Class 0.5 Absorbed Power: Voltage loop: <0.6VA, Current loop: <0.1VA Overload resistance: Voltage: 800Vcontinuous Current ...