The working principle of the universal transfer switch is mainly: First, it has three parts, namely the operating mechanism, the positioning device and the contacts. Then its contact is a double-end bridge structure, which can automatically adjust the switch. When we turn the gear position by hand, we can first look at the steering of the axle, and then just switch it in order. The main thing is to convert household appliances of different currents and then convert them into normal operation under the applicable current and voltage.