The instrument is supplied by AC220V/50Hz (±10%) power, with measuring range of 0 ~ 5A and accuracy of 0.5 level. With manual/automatic range switching function, there are three levels: 5A, 1000mA, 100mA. The rs-485 communication interface supports the standard modbus-rtu communication protocol, the output function of the over-quantity relay or the alarm function of the over-range buzzer. The installation mode is industrial grade cabinet.