Vertiv Liebert PSI5 UPS - 1440VA 1350W 120V 1U Line Interactive AVR Rack Mount UPS, 0.9 Power Factor

Protect your critical equipment with the Vertiv Liebert PSI5 UPS, a compact yet powerful 1440VA uninterruptible power supply designed for schools, homes, and offices. Built for reliability and ease of deployment, this 1U rack-mount UPS delivers dependable power protection for servers, networking gear, workstations, and essential peripherals. Whether you’re safeguarding a home lab, a classroom presentation setup, or a small business rack, the PSI5 provides clean, stable power and helps extend the life of your devices by buffering them from outages, surges, and voltage fluctuations.

The PSI5 is engineered for versatility and value, delivering essential protection without complexity. Its line-interactive AVR topology means it can compensate for minor power dips and spikes on the incoming line, delivering a regulated output to connected equipment. This feature reduces the risk of data corruption and equipment damage during brownouts, sags, and minor disturbances, letting you work with confidence and preserving uptime when mains quality is less than ideal. For IT teams, teachers, and remote workers alike, the PSI5 offers a practical mix of capacity, efficiency, and rack-friendly form factor that fits neatly into 19-inch equipment racks or on a sturdy shelf with space savings in dense workspaces.

Designed to be user-friendly from install to everyday operation, the PSI5 provides key features you expect from a modern UPS. It protects against the most common power disturbances—outages, brownouts, surges, noise, and line noise—while maintaining a clean waveform designed to minimize electrical stress on sensitive electronics. Its 0.9 power factor maximizes usable output capacity, meaning you can power more critical devices without over-provisioning. Coupled with automatic voltage regulation and a compact 1U form factor, the PSI5 is as practical as it is powerful for practical, real-world deployments where space, cost, and reliability matter most.

In terms of management and maintenance, the Liebert PSI5 is built for straightforward operation and lifecycle management. It typically offers a USB interface for monitoring, diagnostics, and safe shutdown of connected equipment, enabling quick integration with existing IT or AV systems. This makes it easier to perform routine tests, run self-diagnostics, and ensure your systems remain protected even during unattended operations. The combination of solid electrical protection, a user-friendly interface, and a compact rack-mount design makes the PSI5 a compelling choice for people who need dependable power protection without adding complexity or bulk to their setup.

Whether you’re protecting a small business server, a classroom computer lab, a home media center, or a critical network appliance, the PSI5 provides a balanced blend of power, protection, and practicality. With Vertiv’s trusted Liebert brand heritage, you’re choosing a solution designed to deliver consistent performance and peace of mind—even when the electricity grid isn’t perfect. The PSI5 UPS is a smart investment for anyone who values data integrity, equipment longevity, and uninterrupted productivity in demanding environments.

• High-capacity, compact UPS for versatile protection: The Vertiv Liebert PSI5 delivers 1440 VA / 1350 W of backup power in a small 1U rack-mount chassis, offering ample headroom for essential devices while keeping equipment racks clean and organized.
• Space-efficient 1U rack-mount design: Optimized for server rooms, IT closets, classrooms, and small offices, the PSI5 fits neatly into standard 19-inch racks, enabling easy integration with other equipment and streamlined cable management.
• Line-Interactive AVR for clean power: Automatic Voltage Regulation stabilizes output during brownouts and minor grid disturbances, protecting sensitive electronics and preserving data integrity without stepping up to costly online topologies.
• Comprehensive protection against power disturbances: From outages to surges and electrical noise, the PSI5 shields connected devices, helping extend their life and reduce maintenance costs while maintaining uptime for critical workflows.
• Simple monitoring and management: USB-based monitoring and compatibility with Liebert software provide visibility into UPS health, automatic safe shutdown, and proactive fault alerts, making it easier to maintain operational readiness.

Technical Details of Liebert PSI5 UPS

• Capacity: 1440 VA / 1350 W
• Output Voltage: 120 V
• Input Voltage: 120 V AC (auto-sensing)
• Form Factor: 1U rack-mount
• Topology: Line-Interactive AVR
• Power Factor: 0.9
• Battery Type: Maintenance-free sealed lead-acid battery

How to Install Vertiv Liebert PSI5 UPS

• Plan the installation by choosing a well-ventilated, dry location with adequate clearance for air flow and cable access. Confirm that your rack can accommodate a 1U device and that the power and network connections nearby support the load you plan to protect.
• Mount the PSI5 in a standard 19-inch rack using the included hardware. Ensure it is securely fastened and level, with space around the unit to allow for cooling and easy cable routing.
• Connect your essential devices to the UPS outlets. Prioritize critical equipment, such as servers, routers, switches, and workstations, so they receive uninterrupted power during an outage and protection from surges and noise. Avoid overloading the UPS by staying within its 1350 W rating.
• Connect the UPS to a clean AC power source using the appropriate power cord, and connect the USB management cable to a compatible computer or networked device. Install and configure the Liebert monitoring software if you plan to monitor status remotely or enable automatic safe shutdown of connected equipment during extended outages.
• Power on the UPS and run a self-test to verify that the battery and electronics function correctly. Review the status indicators and logs, set alert thresholds, and configure shutdown and notification options to align with your operational requirements. Plan routine maintenance checks to keep the system in peak condition.

Frequently Asked Questions

• What devices does the PSI5 UPS protect? It protects essential electronics such as servers, networking gear, computers, storage devices, and other sensitive equipment from power interruptions, brownouts, surges, sags, and high-frequency noise.
• What is the form factor? The PSI5 is a compact 1U rack-mount UPS designed to fit standard 19-inch racks, making it ideal for office, classroom, and small data-center deployments.
• What is the input/output voltage? The UPS operates with 120 V AC input and provides a 120 V AC output, suitable for common U.S. electrical standards and many international configurations via compatible outlets.
• How can I monitor and manage the UPS? A USB interface is provided for monitoring, diagnostics, and safe shutdown of connected devices. It is compatible with Liebert monitoring software for centralized visibility and alerts.
• Is the battery user-replaceable or serviceable? The PSI5 uses a maintenance-free sealed lead-acid battery designed for reliable operation, with recommended service procedures outlined in the user manual and supported by authorized service providers if needed. Runtime will vary with load, so plan according to your critical load and recovery requirements.