The XP Power Class II PBL500 series of AC-DC switching power supplies, in a package of just 4 x 7 x 1.56 inches, deliver 450-500 watts of continuous power with forced air cooling or 250 watts with convection cooling. The units are constructed on a U-Channel for mechanical support and heat sinking. A cover and fan assembly can be added during manufacturing. They are designed for medical applications including those needing BF rated insulation with an operation altitude up to 5000 meters.