Isolated, switching power supplies with universal 100- to 250- Vac input for use with Snap PAC System hardware include a built-in fuse, on/off power switch and LED indicator. Snap-PS5U provides 5 Vdc for loads to 5.0 A for a rack-mounted Snap PAC I/O processor or rack-mounted controller plus associated I/O modules. Snap-PS24U provides 24 Vdc at 1.25 A to power a Snap PAC S-Series controller, or to provide loop power for isolated current-loop analog modules.