3kVA/3KW double-conversion on-line pure sine wave 1U rackmount UPS Add up to 5 external battery packs (SRTL50RMBP1U-Li) for extended runtime Rack/Tower convertible (rail kit included) Graceful shutdown of physical servers, virtual machines and HCI Clusters Lithium-ion battery minimizes the need to replace battery during the life time of UPS