Voltage transformation switch loop with control

The utility model relates to the technical field of electrical switch control loops, in particular to a transformation switch loop with control, which comprises a motor, a switching power supply A, a switching power supply B and a switching power supply C. One end of the switching power supply A is electrically connected with the motor through a branch line, and one ends of the switching power supply B and the switching power supply C are respectively and electrically connected with the motor. The other end of the switching power supply A is electrically connected with a protection device, one side, deviating from the switching power supply A, of the protection device is electrically connected with a switching power supply N. An intermediate relay is arranged between the switching power supply N and the switching power supply A. The utility model solves the problems that the heat in the cabinet is difficult to dissipate, the insulation aging of the control lead is accelerated along with the prolonging of the