A switch controls circuit for a power supply, comprising: a diode, a short circuit protection element, a switch unit (K 1, K 2), and a contactor, wherein: a cathode of the diode is connected with a negative electrode of the power supply, an anode of the diode is connected with a first terminal of the short circuit protection element, a second terminal of the short circuit protection element is connected with a first terminal of the switch unit (K1; K2), a second terminal of the switch unit (K1; K2) is connected with a first junction of the contactor, and a second junction of the contactor is connected with a positive electrode of the power supply, wherein the first and second junction are connected by a coil of the contactor, wherein the short circuit protection element is configured to provide short circuit protection to a loop to which it belongs, and the switch unit (K1; K2) is configured to control on/off of the loop to which it belongs, and wherein a first contact of the contactor is connected with the negative electrode of the power supply, and the positive electrode of the power supply and a second contact of the contactor serve as two output terminals of the power supplying circuit to supply power to a load. a diode, a short circuit protection element, a switch unit (K 1, K 2), and a contactor, wherein: a cathode of the diode is connected with a negative electrode of the power supply, an anode of the diode is connected with a first terminal of the short circuit protection element, a second terminal of the short circuit protection element is connected with a first terminal of the switch unit (K1; K2), a second terminal of the switch unit (K1; K2) is connected with a first junction of the contactor, and a second junction of the contactor is connected with a positive electrode of the power supply, wherein the first and second junction are connected by a coil of the contactor, wherein the short circuit protection element is configured to provide short circuit protection to a loop to which it belongs, and the switch unit (K1; K2) is configured to control on/off of the loop to which it belongs, and wherein a first contact of the contactor is connected with the negative electrode of the power supply, and the positive electrode of the power supply and a second contact of the contactor serve as two output terminals of the power supplying circuit to supply power to a load. a cathode of the diode is connected with a negative electrode of the power supply, an anode of the diode is connected with a first terminal of the short circuit protection element, a second terminal of the short circuit protection element is connected with a first terminal of the switch unit (K1; K2), a second terminal of the switch unit (K1; K2) is connected with a first junction of the contactor, and a second junction of the contactor is connected with a positive electrode of the power supply, wherein the first and second junction are connected by a coil of the contactor, wherein the short circuit protection element is configured to provide short circuit protection to a loop to which it belongs, and the switch unit (K1; K2) is configured to control on/off of the loop to which it belongs, and wherein a first contact of the contactor is connected with the negative electrode of the power supply, and the positive electrode of the power supply and a second contact of the contactor serve as two output terminals of the power supplying circuit to supply power to a load.