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.