A modular power unit having a form factor enabling mounting in one of a plurality of component locations of an equipment rack, to provide direct current 'DC' power to a DC bus of the equipment rack which is supplying DC power to one or more equipment components mounted in other ones of the component locations of the equipment rack, the modular power unit comprising: a chassis defining a plurality of slots into which a plurality of DC power supplies may be inserted; an alternating current 'AC' module disposed within the chassis for receiving AC power from an external AC power source; a plurality of independent, modular DC power supplies (16, 18) each having a common form factor enabling insertion and mounting in any one of the slots of the chassis; a controller in communication with the plurality of DC power supplies (16, 18), the controller being housed within the chassis and having a form factor enabling it to be inserted and mounted in one of the slots of the chassis; and a DC bus (22a, 22b) housed within the chassis and in communication with the DC power supplies for supplying DC output power from the DC power supplies to a separate DC bus housed within the equipment rack; and further comprising a connector assembly having a first connector component associated with a given one of the power supply modules, and a second connector component mounted within the chassis, the second connector component comprising copper pins adapted to engage with the DC bus (22a, 22b) and with pins of the first connector component; the first and second connector components being connectable when the given one of the power supplies is inserted into the chassis and operative to: transmit the DC output from the given one of the power supplies to the DC bus mounted within the chassis; and enable a connection to be made between a control bus in communication with the controller and the given one of the power supplies. a chassis defining a plurality of slots into which a plurality of DC power supplies may be inserted; an alternating current 'AC' module disposed within the chassis for receiving AC power from an external AC power source; a plurality of independent, modular DC power supplies (16, 18) each having a common form factor enabling insertion and mounting in any one of the slots of the chassis; a controller in communication with the plurality of DC power supplies (16, 18), the controller being housed within the chassis and having a form factor enabling it to be inserted and mounted in one of the slots of the chassis; and a DC bus (22a, 22b) housed within the chassis and in communication with the DC power supplies for supplying DC output power from the DC power supplies to a separate DC bus housed within the equipment rack; and further comprising a connector assembly having a first connector component associated with a given one of the power supply modules, and a second connector component mounted within the chassis, the second connector component comprising copper pins adapted to engage with the DC bus (22a, 22b) and with pins of the first connector component; the first and second connector components being connectable when the given one of the power supplies is inserted into the chassis and operative to: transmit the DC output from the given one of the power supplies to the DC bus mounted within the chassis; and enable a connection to be made between a control bus in communication with the controller and the given one of the power supplies. transmit the DC output from the given one of the power supplies to the DC bus mounted within the chassis; and enable a connection to be made between a control bus in communication with the controller and the given one of the power supplies.