APC Smart-UPS RT is a family of high-density, performance UPSs for voice & data networks, medical labs, & light industrial applications. Featuring double conversion on-line topology, the Smart-UPS RT protects your data by supplying reliable, network-grade power. An unlimited number of matching battery packs can be added to comply with aggressive runtime demands of "always on" business-critical systems. Rack-optimized models are an ideal choice for space constrained environments. With capacity up to 10k VA in a convenient rack-mountable 6U form, users can support power hungry blade servers or heavily loaded equipment racks. Customers looking for extremely tight voltage & frequency regulation, internal bypass, & input power factor correction will find them in the Smart-UPS RT.