This product is a self-developed intelligent sensor with insulation leakage and switching quantity detection. The leakage current measurement method is perforated structure. The switch quantity detection is divided into active and passive. PCB mounting mode, no insertion loss, overload It has strong capability, and its input and output are not common. The input signal is DC micro current and switch signal. The output is RS-485 communication interface, which can be used to measure DC system insulation leakage current and output switch status. It is widely used for insulation monitoring and switching quantity detection of each circuit of DC power supply system.