This series of super efficient power supplies provides a long term cost saving in energy cost, more reliability, longer lifetime and require less warranty coverage. The Zero Voltage Switching design reduces power dissipation in the switching transistors and EMI level resulting a quiet (lesser switching noise) and cooler running supply. It is especially suitable for telecommunication, long hour operation, and in close proximity with other equipment. Two supplies can fit neatly in a 2U 19inch rack mount due to the small form factor.