A power supply system is considered redundant if it is constructed so that it has partial power supplies which are independent of each other and each of these can individually deliver the output load. When a fault occurs, therefore, it is still possible to continue to supply the connected rated load. In practice, at least two power supplies are connected in parallel via decoupling diodes, so that a short circuit in the output of a power supply does not lead to a failure of the total power supply.