These wide range devices operate over 4:1 input voltage range, providing a continuously stable output voltage. Input voltage range of 24 & 48VDC converts in output voltages of 3.3, 5, 12, 15, 24, 5, 12 & 15VDC. The normal operation is specified over the full operating temperature range of -25C to +71C with no derating required. Cooling is done by free air convection.