US Patent 9733682 Scalable computing rack power distribution unit

A power distribution unit (PDU) with at least one power distribution module configured in a computing rack and an interchangeable adapter coupled to the power distribution module to provide power to the distribution module. The power distribution module includes multiple power receptacles for coupling to a plurality of devices disposed in the computing rack. The interchangeable adapter is electrically connectable to one of a plurality of different electrical power sources in which each electrical power source has a phase type configuration that differs from one another.