Tripp Lite SU12KRT4UHW 12,000VA / 12Kva / 10,800 watt online, double-conversion UPS system offers complete power protection for critical server, network and telecommunications equipment in an 8U rack/tower configuration. This system delivers complete N+1 redundancy when used at loads up to 6kVA, and non-redundant operation at loads between 6 and 12kVA. Fault-tolerant auto-bypass prevents unexpected service interruptions during UPS overload or internal fault conditions. Included parallel PDU with manual bypass switching enables hot-swappable replacement of all major UPS system components in both N+1 and combined operating modes. Enhanced availability, fault tolerance and simple hot-swap replacement options make this UPS ideal for advanced networking applications in data centers, computer rooms, network closets and rugged industrial locations.Tripp Lite SU12KRT4UHW 12kVA, 12,000VA / 10,800 watt on-line, double-conversion UPS system in 8U total rack/tower configurationUnique configuration offers 12kVA non-redundant operation and automatic N+1 redundancy at load levels of 6kVA and underIncluded Parallel PDU with manual bypass switch enables hot-swap replacement of power modules at any supported load levelHardwire input and output connectionsMaintains sine wave output within 2% of selectable 200/208/220/230/240V nominalSupports 50/60Hz operation for worldwide frequency compatibilityExpandable runtime with optional external battery packsSome external battery configurations require the use of Tripp Lite's External Battery Configuration Software (see manual)Intelligent battery management system with temperature-compensated charging extends battery lifeBattery independent restart ensures automatic UPS power-up after lengthy power outages, even with expired batteriesCompatible with Tripp Lite UPS management card options TLNETCARD, WEBCARDLX, SNMPWEBCARD, MODBUSCARD and RELAYIOCARDOptional WEBCARDLX with the latest version of PowerAlert Device Manager firmware (PADM20) provides enhanced remote management capabilitiesPADM20 and PowerAlert Element Manager (PAEM) form a powerful tool for expanding maintenance functions in large installations, including firmware update checks and backup and restoration of device configurationsOptional RELAYIOMINI interface modules available (requires removal of USB interface module)Applications utilizing the optional network communications card require two compatible card accessories (install one per included power module)HID-compliant USB interface enables integration with built-in power management and auto shutdown features of Windows and Mac OS XUSB & Serial ports enable data-saving unattended shutdown when used with Tripp Lite's PowerAlert software, available via FREE download from www.tripplite.com/poweralertOptional 2POSTRMKITHD supports installation in 2 post 19 inch racks (2 required)Optional 2-9USTAND supports upright tower placement (1 required)Supports Emergency Power Off (EPO) via built-in interfaceFront panel LEDs and LCD readout with scroll controlsLED / LCD display panel rotates for viewing in rackmount or tower configurationsExternal battery packs are field replaceable and hot swappableFrequency conversion mode enables conversion of 60Hz to 50Hz or 50Hz to 60Hz (no de-rating)$250,000 Ultimate Lifetime Insurance (U.S., Canada, and Puerto Rico only)