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The Smart Online SU5000RT4U on-line, double conversion UPS protects server, networking or telecommunications equipment from blackouts, voltage fluctuations and surges in a compact tower or 4U rackmount housing. Upright tower placement of the system is supported with the included tower stands. The power module converts raw input AC to DC, then back to perfect sine wave AC output within 3% of user-selectable 208/120 or 240/120VAC output voltages. Frequency regulation locks output power to 50/60Hz (+/-0.5 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. This UPS supports simultaneous detailed monitoring of equipment load levels, self-test data and mains power conditions via all 3 network interfaces at once. In addition, internal batteries and optional external battery packs are field replaceable and hot swappable.