An electrical power system comprising: an electrical power generating system EPGS ; one or more constant power loads powered by the EPGS; and a power management and distribution PMAD center located between the EPGS and the one or more constant power loads, characterised by the PMAD center comprising one or more load management channels , each of the one or more load management channels operatively connected to a respective constant power load, wherein each of the load management channels comprises a load management function circuit and a decoupling filter , wherein each load management function circuit comprises a positive rail contactor located on a positive rail, a negative rail contactor located on a negative rail, and an inrush-current limiting contactor; wherein the load management function circuit can operate in one or more of: a power-up built-in test mode, and wherein during the power-up built-in test mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open; a pre-charge mode, and wherein during the pre-charge mode, the positive rail contactor is open, and the negative rail contactor and the inrush-current limiting contactor are closed; a load on mode, and wherein during the load on mode, the positive rail contactor and the negative rail contactor are closed; and a load off/fault isolation mode, and wherein during the load off/fault isolation mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open. an electrical power generating system EPGS ; one or more constant power loads powered by the EPGS; and a power management and distribution PMAD center located between the EPGS and the one or more constant power loads, characterised by the PMAD center comprising one or more load management channels , each of the one or more load management channels operatively connected to a respective constant power load, wherein each of the load management channels comprises a load management function circuit and a decoupling filter , wherein each load management function circuit comprises a positive rail contactor located on a positive rail, a negative rail contactor located on a negative rail, and an inrush-current limiting contactor; wherein the load management function circuit can operate in one or more of: a power-up built-in test mode, and wherein during the power-up built-in test mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open; a pre-charge mode, and wherein during the pre-charge mode, the positive rail contactor is open, and the negative rail contactor and the inrush-current limiting contactor are closed; a load on mode, and wherein during the load on mode, the positive rail contactor and the negative rail contactor are closed; and a load off/fault isolation mode, and wherein during the load off/fault isolation mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open. a power-up built-in test mode, and wherein during the power-up built-in test mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open; a pre-charge mode, and wherein during the pre-charge mode, the positive rail contactor is open, and the negative rail contactor and the inrush-current limiting contactor are closed; a load on mode, and wherein during the load on mode, the positive rail contactor and the negative rail contactor are closed; and a load off/fault isolation mode, and wherein during the load off/fault isolation mode, the positive rail contactor, the negative rail contactor, and the inrush-current limiting contactor are open. <EOS>