Power distribution unit
A power distribution unit (PDU) or mains distribution unit (MDU) is a device fitted with multiple outputs designed to distribute electric power, especially to racks of computers and networking equipment located within the data center.
PDUs vary from simple and inexpensive rack-mounted power strips to larger floor-mounted PDUs with multiple functions including power filtering to improve power quality, intelligent load balancing, and remote monitoring and control by LAN or SNMP.
In data centers, larger PDUs are needed to power multiple server cabinets. Each server cabinet may require multiple high current circuits possibly from different phases of incoming power or different UPSs. Standalone cabinet PDUs are self-contained units that include main breakers, individual circuit breakers, and power monitoring panels. The cabinet provides internal bus bars for neutral and grounding. Prepunched top and bottom panels allow for safe cable entry.