UPS Eaton 9PX 3000VA RT3U (9103-83805) The Eaton 9PX 3000VA RT3U is an online uninterruptible power supply suitable for use with servers, networking equipment, and point-of-sale terminals. The UPS supports the connection of external battery packs to extend runtime. To replace the main battery, the UPS must be turned off. The model is equipped with an LCD screen. Connection to a computer is made via USB and RS-232 interfaces. UPS management can be expanded with a special module. The UPS chassis is universal; it can be installed in a rack or placed on the floor. In a cabinet, it will occupy 3U.