Power supply switching system and switch apparatus

A switch apparatus electrically connected between an alternating current (AC) power and a power shelf, the switch apparatus being further electrically connected with a switch controlling apparatus;

• the power shelf having at least two AC inputting ends;
• the switch apparatus being electrically connected between one of the AC inputting ends and the AC power, the switch apparatus comprising a switch circuit and a relay, wherein the switch circuit comprises at least two switch transistor bridge arms;
• each of the at least two switch transistor bridge arms comprises at least two switch transistors;
• one of the at least two switch transistors as an upper bridge arm receives the voltage outputted by the AC power;
• another of the at least two switch transistor as a lower bridge arm is electrically connected with one of the AC inputting ends of the power shelf;
• controlling terminals of the switch transistors in the upper bridge arm and the lower bridge arm are electrically connected with the relay, and receives a controlling voltage through the relay;
• when the relay turns on, the switch circuit turns on for powering the power shelf by the AC power;
• when the relay turns off, the switch circuit turns off for stopping powering the power shelf by the AC power;
• wherein a middle point in each of the at least two switch transistor bridge arms is electrically connected with a negative terminal of a direct current (DC) power;
• the controlling terminals of the switch transistors in the upper bridge arm and the lower bridge arm are electrically connected with a positive terminal of the DC power through the relay;
• the DC power is configured to output the controlling voltage;
• when the relay turns on, the controlling voltage outputted by the DC power is outputted to the controlling terminals of the switch transistors.