Featuring 3 x 5 in. footprint that fits within 1U height, CHD250 Series comprises 5 fanless, open-frame power supplies with single output voltages of +12, 15, 24, 28, and 48 Vdc. Units offer no-load power consumption of less than 0.5 W and achieve efficiency of 93–94% at 230 Vac and full load. Operating from -20 to +70°C with no derating until +50°C, 250 Watt power supplies include power fail signal, output inhibit and remote sense, and user-adjustable output voltage of +5/-4%.