Abstract: The present invention prevents a failure from occurring in an electric vehicle. This electric vehicle is driven by power obtained from a power line via a collector, an energy source mounted on the electric vehicle, or using both thereof, and causes power generated, for example, during braking to be regenerated to the power line via the collector or to be consumed in a load mounted on the electric vehicle. The electric vehicle is characterized by having a function of electrically separating the collector from the power line when the voltage of the power line or a circuit voltage within the electric vehicle deviates from a predetermined range.

Abstract: A power supply system for electric vehicle comprising; power; a first power line; and a second power line; wherein the output of the high voltage side from the power line is fed to the high voltage side of each of the first power line and the second power line, the output of the low voltage side from the power line is fed to the low voltage said of each of the first power line and the second power line, the first power line and the second power line are connected at their far ends and a power supply system for electric vehicle that supplies electric power to an electric vehicle by means of said first power line or said second power line. the first power line and the second power line have a bypass line that interconnects from the power to the connection at the far end.