Measuring 41 x 355.6 x 101.6 mm, D1U4 Series allows up to 4 supplies to be contained on single 1U-high 19 in. rack-mounting chassis. Programmable power supplies, accommodating input range of 90–264 Vac, provide 54 Vdc primary output and standby 12 Vdc for powering standby circuitry. Main output of each supply is isolated and floating, enabling positive or negative polarity operation. Units offer standard I²C or advanced PMBus communications, bidirectional output isolation, and PoE compatibility.