The Tripp Lite Smart Online SU6000RT3UHV On-Line, Double Conversion UPS protects server, networking and telecommunications equipment from blackouts, voltage fluctuations and surges in a compact tower/rackmount housing. In rack configuration, the power module and external battery pack occupy only 3 rack spaces each (6U total). Tower placement of the entire system is also supported with the included upright tower stands. The large capacity 6000VA/4200-Watt power module converts raw input AC to DC, then back to perfect sine wave AC output for two of the user-selectable (200/208/220/230/240V AC) output voltages. Frequency regulation locks output power to 50/60Hz (/-0.2 Hz), removing harmonic distortion, fast electrical impulses and other hard-to-solve power problems not addressed by other UPS types. Perfectly regulated, continuous sine wave output with zero transfer time offers guaranteed compatibility with all equipment types. The hardwire input and output connections support a variety of permanent or PDU style power connections. Battery support can be extended indefinitely through the addition of external 3U rackmount battery packs (part BP240V10RT3U). This unit includes a slot for an internal SNMP/web card, plus a DB9 enhanced serial monitoring port for unattended shutdown, remote control and monitoring of UPS system and power data.