Deliver backup power where rack space is tight and uptime still matters. The Vertiv Liebert PSI5 1500 1350W, 120VAC is designed for infrastructure teams that need dependable protection for network gear, edge systems, and compact server deployments without giving up valuable rack units. With 1,500 VA and 1,350 W of capacity, it is sized for essential loads that must stay online through short outages and utility disturbances. The 120 VAC design aligns with common North American power environments, while the rack-mount format keeps installation clean and predictable in standardized cabinets. This model is a practical step up from basic desktop backup units because it is built for the realities of rack-based IT: constrained space, shared power circuits, and equipment that cannot tolerate abrupt shutdowns. For teams evaluating UPS options, the PSI5 1500 offers the right balance of capacity, footprint, and deployment simplicity for branch infrastructure, telecom closets, and edge locations where every rack unit counts.