Power distribution unit

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 a data center.[1] Data centers face challenges in power protection and management solutions. This is why many data centers rely on PDU monitoring to improve efficiency, uptime, and growth.[2]

Form factors

Rack mount

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] This kind of PDU placement offers capabilities such as power metering at the inlet, outlet, and PDU branch circuit level[3]and support for environment sensors.[4]


Cabinet PDU with access doors open

In data centers, larger PDUs are needed to power multiple server cabinets. Each server cabinet or rows of cabinets 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.[5]


In home or offices power distribution units are movable to a certain extent.

A distribution unit embedded in the wall
A power cord or distribution unit

See also


  1. 1 2 "Definition of: Power distribution unit". PCMag.com. Ziff Davis. Retrieved March 8, 2014.
  2. "Sentry Power Manager: Rack-Level Data Center Power Monitoring and Management". ServerTech.com. Server Technology. 2014. Retrieved January 1, 2015.
  3. "The Advantages of Metering at the Inlet, Outlet, and Branch Circuits of Rack PDUs". Raritan.com. 2015. Retrieved May 25, 2015.
  4. "PX Intelligent Rack PDUs". Raritan.com. 2015. Retrieved May 26, 2015.
  5. "Cabinet Power Distribution". APC. Retrieved November 4, 2013.
This article is issued from Wikipedia - version of the 11/24/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.