Step-Down Transformer. - Includes : Mounting hardware , Rack Mounting brackets , User Manual , Warranty card - Rack-Mountable: Includes horizontal, vertical, and toolless-mount varieties. Puts power where it is needed most - in the racks near the equipment - Transformer for Step-down or Step-up or Isolation: Step down transformer placed upstream of the UPS to avoid inrush current and saturation eliminating need to oversize transformer