Abstract: A power supply device for supplying power to a consumer disposed on a rail vehicle is being configured for generating a supply voltage of the consumer from a voltage applied to the conductor. Transmission electronics and a bypass conductor connectable in an electrically conductive manner to the consumer via the transmission electronics are provided and the transmission electronics is switched between the bypass conductor and the consumer and the bypass conductor is connected in an electrically conductive manner to the conductor by means of two fastening interfaces, a potential difference being present between the fastening interfaces and the bypass conductor being designed in such a manner that the bypass conductor generates an output voltage and the transmission electronics being designed in such a manner that the transmission electronics generates the supply voltage of the consumer from the output voltage.

Abstract: A power supply device for supplying power to a consumer disposed on a rail vehicle having at least one conductor and the power supply device being configured for generating a supply voltage of the consumer from a voltage applied to the conductor. Transmission electronics and at least one conductor loop connectable in an electrically conductive manner to the consumer via the transmission electronics and having n windings are provided. Transmission electronics is disposed between the conductor loop and the consumer, and the conductor loop disposed about the conductor to generate an outlet voltage, the transmission electronics being designed in such a manner to generate the supply voltage of the consumer from the outlet voltage of the conductor loop. A monitoring system having a power supply device and a method for supplying power to a consumer for monitoring a rail vehicle are also provided.