The Xantrex HPD Series stands for "High Power Density", providing 300 watts in a quarter-rack wide chassis. 

The HPD uses switch-mode technology combined with linear post regulation to provide performance comparable to an all-linear design. Excellent line and load regulation is matched by low noise and good transient response. 

This series is available in singles and duals in a single package for benchtop use. For systems applications, multiple units can also be rack mounted in one to four unit configurations for up to four independent 300 watt outputs. 

Further, the 300 watt HPD can be combined in mix and match rack combinations with the quarter-rack 60 watt XT Series or 500W XPD units. The small size and high power density of the HPD Series also makes it the smart choice for OEM applications where wide adjustment of output voltage or current is required in a compact package, providing up to 300 watts of clean power.