The voltage range is 100~250V and 380V, and CHV-25P module can be selected, +V, connected to the positive pole of power supply, -V, connected to the negative pole of power supply. The power supply voltage is ±12-15V, which is connected to the positive and negative terminals on the right side. The detected current is output or input from the terminals and connected to zero potential through the sampling resistor. The ratio of the primary and secondary side currents is 2∶5, that is, the primary side 10mA corresponds to the secondary transformer 25mA.