Abstract: A rack power distribution system includes a unique configuration of electrical power wiring, branch circuit panels, branch circuit breakers, and three-phase power distribution devices packaged in the compound housing that mounts within standard EIA racks. The input side receives three-phase power, includes an input breaker and an optional maintenance bypass switch. The output side of the device utilizes multiple three-phase power output assemblies which can be connected to different breakout units designed to support several alternatives such as single phase power strips. As one option, the output may consist of a breakout cable consisting of a wiring harness with a three-phase plug at one end and one to three single phase receptacles of matching or lesser ampacity on the other end. The invention includes a housing which is provided with easily removed front and top panels and side-mounted rails/slides for a “draw out” type mounting in the rack.