Abstract: A power distribution unit may include an input power connector configured to receive input electrical power from an external power source. The power distribution unit may include a primary busbar configured to receive the input electrical power from the input power connector and distribute the input electrical power via a power configuration. The power distribution unit may include an output controller assembly configured to receive distributed input electrical power from the primary busbar and manage the distributed input electrical power. A power distribution unit may include a plurality of receptacles configured to receive the distributed input electrical power from the output controller assembly, wherein power to one or more of the plurality of receptacles is based on the power configuration.

Abstract: The present disclosure is directed to a rack power distribution unit (RPDU) that automatically and safely switches power to one or more receptacles. The RPDU includes one or more processors utilizing control algorithms that manage bistable relays so that in-rush current is minimized upon manual connection/disconnection of power to a load device. In particular, relay contact status (open/closed) is identified based on changes in RMS or peak voltage influenced by the load impedance. The RPDU is also configured to predict timings for voltage zero-crossing events. In this manner, and based on the determination of relay contact status and voltage zero-crossing prediction, open relay contacts are identified and safely closed at voltage zero-crossing.

Abstract: The present disclosure is directed to a rack power distribution unit (RPDU) that automatically and safely switches power to one or more receptacles. The RPDU includes one or more processors utilizing control algorithms that manage bistable relays so that in-rush current is minimized upon manual connection/disconnection of power to a load device. In particular, relay contact status (open/closed) is identified based on changes in RMS or peak voltage influenced by the load impedance. The RPDU is also configured to predict timings for voltage zero-crossing events. In this manner, and based on the determination of relay contact status and voltage zero-crossing prediction, open relay contacts are identified and safely closed at voltage zero-crossing.