The product is mainly used in electric RMU load switch, the operation is simple and has good anti-vibration and anti-interference ability, can achieve electric and remote operation and motor reset tracking. At the same time according to the number of light flashing, can know timely the cause of fault, so that save largely the troubleshooting time and improve work efficiency. In addition, the product also reserve the real-time clock and RS485 interface, support IEC60870-5-101 protocol, and can output the signal of opening and closing action.