This category of power supplies comes standard with a metal chassis for heat transfer and a metal enclosure (case) satisfying UL requirements for open units. In addition, the case enhances the already excellent noise suppression characteristics of the unit. Available in single or multiple outputs, from 15 to 320 watts and output voltages 3.3 to 56V. These units are of high quality as witnessed by our 3-year continuous use warranty and RMA program. The right power supply to use when longevity and dependability is required.