A copper bar component for switching an input/output mode of an uninterruptible power supply (UPS), and a power system includes an enclosure of the UPS, at least one bracket and a plurality of copper bars. The plurality of copper bars are fastened to each of the at least one bracket, and the plurality of copper bars are connected to an input or output wiring terminal on the enclosure of the UPS. Each of the at least one bracket is made of an insulating material. The plurality of copper bars are arranged on each of the at least one bracket according to one input mode or output mode of the UPS, and the plurality of copper bars are arranged on the at least one bracket in a one-to-one correspondence to at least one of an input mode or an output mode of the UPS.