Abstract: Apparatus for a redundant power supply comprises a receptacle and a pair of power supply inserts received therein and having connectors for the input voltage and for the output voltage. The outputs of two or more such power supply inserts are directly connected in parallel to one another. To this end, differently designed or arranged contact members for the input voltage and for the output voltage are provided. In a preferred embodiment, so-called leading contacts are employed for a charging current at the output side via a charging resistor before connecting the output of the insert being plugged in parallel with the output of an operating insert.