Keep essential equipment online through brief outages and unstable utility conditions with the Vertiv Liebert PSI5-1100RT120. Built for space-conscious IT rooms, this 2U rack-tower UPS delivers 1,100 VA / 990 W of capacity in a format that fits either rack or tower deployment. It supports 100 V AC, 110 V AC, 115 V AC, 120 V AC, and 125 V AC input ranges, making it a practical fit for standard North American power environments. With 6 x NEMA 5-15R outlets, this unit is sized for protecting a focused set of critical devices rather than overcommitting capacity. That matters when uptime, battery runtime, and clean power delivery are more important than raw outlet count. The 2-minute standby time provides a short but meaningful bridge for graceful shutdowns, transfer handling, or brief power interruptions. For teams standardizing on rack-tower UPS hardware, the PSI5-1100RT120 offers a disciplined balance of footprint, output capacity, and deployment flexibility. It is a strong choice for branch offices, network closets, and edge racks where every rack unit and every watt must justify itself.