The Extech 382276 is a Switching Mode DC Power Supply has an adjustable output of 0 to 30V/ 20A with two user-defined presets and one 13.8V/20A factory preset. Power supply features dual LED displays, high RFI immunity, excellent EMI, and a Thermostatic Control Fan. Additional features include over-voltage, over-temperature, and short circuit protection. Operates at 220V, 50/60Hz.