FEAS Redundancy modules provide the decoupling of two identical DC-power supplies in order to either increase the output power or achieve a higher degree of system stability. In case of mains power failure or an internal defect of one power supply, the other power supply is still feeding the DC-circuit without interruption. For this, the performance of the used power supplies are calculated in a way, that all consumers can be powered with just one DC-power supply. With this method, the operational reliability of the whole system is effective enhanced.