The utility model provides a controlling means for balanced governing system of low -voltage load, a serial communication port, including treater, communication mechanism, signal acquisition mechanism, power machine structure, input/output mechanism and actuating mechanism, the connect the processor of communication mechanism, signal acquisition mechanism be connect the processor and power machine structure respectively, and input/output mechanism is connect the processor and actuating mechanism respectively. The utility model discloses a controlling means for balanced governing system of low -voltage load has simple structure, convenient operation's an advantage, can make to the on -off switch control among the balanced governing system of low -voltage load more intelligently, more accurate through the institutional advancement to controlling means, guarantees the effective regulation to low -voltage load is balanced.