Eaton 3105 UPS Product Support Brochure Manual Contact Sales Rep The affordable, compact Eaton 3105 UPS system was designed to deliver the best UPS power management solution for your small office or home office.  Ready to switch to UPS battery power any time it detects a power problem within the utility, the 3105 UPS delivers reliable power quality and UPS backup power for wireless phones, small office PBX or key phone systems, home office workstations, small office desktop servers, small network nodes, point-of-sale systems, and computer peripheral devices.   The systems below have been discontinued, they have been replaced with the redesigned Eaton 3S.