Mains distribution unit

A mains distribution unit (MDU) is a rackable power distribution electrical device, mostly used in high-availability environments like central apparatus rooms, data centers, server rooms to distribute clean power within racks. Each MDU power inlet is fused for surge protection and power fluctuations.

MDUs usually have multiple 415 VAC 12–14 high-density IEC 60320 outlets per 1U of rack space, with tie bar and inlet connectors. A 12-outlet MDU is generally capable of 6 amps maximum continuous current load per outlet, with a total combined load of 16 amps, each outlet have an assigned LED to allow identification of failed fuses. Larger MDUs might vertically span the height of a rack. Modern MDUs intelligently load balance internally, and can also be remotely monitored and managed over LAN or WAN networks.

MDU applications
Commonly used MDU installation environments:


 * Central apparatus rooms
 * Data centers
 * Server rooms
 * Radio/television broadcast environments
 * Recording studios