Dell PowerEdge 1800 Power Distribution Board.
The Dell Poweredge 1800 has 2 options for power, a single 650 watt power supply or Redundant 650 watt power supplies.
if you have experienced a complete power failure on you PowerEdge 1800 with redundant power supplies,
It is likely the your power distribution board has failed.
The PowerEdge 1800 Power Distribution Board is located at the top of the tower and is the receptacle into which the Redundant Power supplies connect.
The output wiring connect to the various components of the system
Note: We offer both Power and Distribution together: here (Dell Poweredge 1800 Redundant PowerSupply & Distribution Board Y4345 COMBO)