A power distribution device includes a number (N, N≧2) of power input terminals, a number (M, M≧2) of power output terminals, and a number (M) of power distribution circuits, each electrically coupled to a corresponding one of the power output terminals and electrically coupled to a number (P, P≧2) of the power input terminals. Each of the power distribution circuits includes a number (P) of diodes each electrically coupled between a respective one of the power input terminals and the corresponding one of the power output terminals, a switch element connected in parallel to one of the diodes, and a controller controlling the switch element to operate in a conducting state when the controller determines that power received at the power input terminal connected to the switch is normal, and controlling the switch element to operate in a non-conducting state when the power is abnormal.