WBK1I1KS41 uses a special isolation module to monitor the AC current in the grid and circuit in real time. When the AC current exceeds the set upper limit, the output exceeds the limit alarm signal, and the output signal is the relay contact signal. The operating limit value of the alternating current can be arbitrarily set within the input range. The input and output of the product are completely isolated, with high precision, high isolation and low drift. It can be applied to motor overload monitoring, power loss detection, motion verification, signal isolation conversion and other occasions.