The 3V relay isolation drive control module, the core is the electronic control device relay, which has a control system (also known as the input loop) and a controlled system (also known as the output loop). The essence is an automatic switch that uses a smaller current to control a larger current ". Used to control 10A 250VAC and 10A 30VDC loads, with output signal indicator prompts. Dual power supply selection design is adopted to enhance anti-interference ability. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.