Outline
1. By means of the transformer passing through the 3 phase bridge rectifying components, it can obtain DC voltage 220V from the AC power supply. The whole equipment is mainly made up of automatic air-switch, transformer, 3 phases bridge rectifying components, DC contactor and so on.

2. The electrical circuit has protection measures, such as short circuit and over voltage. When the capacity of electromagnet being controlled is more than 19kw, the rectifying trnasformer will be installed outside. When the capacity of the electromagnet being controlled is less than or equal to 4kw, it adopts single phase bridge rectifying mode.