â—† Rack-Mountable Occupys only 1U of valuable rack space. Puts the power where it is needed most - in the rack near the equipment. Information Displays Indicates the status of the AC sources powering the units, as well as indicates which source is set as the primary source and which source is currently supplying power to the load. This provides a visual depiction of the power flow from the input to the load. This allows the user to quickly glance at the power flow and status of the input sources without connecting to the unit.