Power distribution unit

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TCP/IP-controlled 19" PDU with USB webcam, environmental IP monitoring

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.[1] Each PDU power inlet is fused for surge protection and power fluctuations.[2][3]

Form factors[edit]

Rack mount[edit]

A 10-outlet rack-mount PDU without built-in surge protection, connected to a UPS (bottom unit on right)

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.[1]

Cabinet[edit]

Cabinet PDU with access doors open

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/control panels. The cabinets provides internal buss bars for neutral and grounding. Prepunched top and bottom panels allow for safe cable entry.[4]

See also[edit]

References[edit]