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Contact Us Find My Liebert® PSI5 UPS Runtime Tool
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Warranty: Vertiv backs all Vertiv™ Liebert® PSI5 UPS systems with two-year, full unit coverage, including the battery. The Vertiv no-hassle, advanced replacement warranty covers all shipping fees and includes next-day delivery, which ensures customers will receive their replacement UPS prior to returning their damaged unit with no questions asked.


ULTIMATE POWER PROTECTION: The advanced pure sine wave UPS from Vertiv compensates for power fluctuations, protects against equipment damage, and prevents data loss during a power disturbance. Automatic voltage regulation (AVR) technology safeguards equipment against a range of utility power fluctuations without battery operation.
EASY MONITORING: The Vertiv™ Liebert® PSI UPS offers a compact 2U rackmount/tower configuration, with the LCD display panel rotating 90 degrees to make the readout easy to see in either configuration, including output overload, or low-battery or replace-battery warnings.
HIGH-END ELECTRONICS: With advanced pure sine wave power conditioning, the Vertiv™ Liebert® PSI UPS protects valuable electronic equipment from the damage power fluctuations can cause. The Vertiv™ Liebert® PSI5 UPS allows users to save their progress during power loss and safeguard expensive electronics when utility power fluctuates.
Eligible for the Vertiv™ Trade-In Program. Contact a Vertiv partner for discount rates and to calculate your savings


Battery backup provides ample time for an orderly shutdown of connected equipment
Liebert® PSI5 UPS operates at a high 0.9 output power factor
Available network communications card provides remote monitoring and power management capability — Local USB or SNMP via optional Vertiv™ Liebert® UNITY communication card
Liebert® PSI5 UPS is compliant with the Restriction of Hazardous Substances Directive (RoHS)
Rotatable LCD Display allows users to view real-time conditions, alarm notices, and runtime information
The standard Liebert® PSI5 UPS can accept external battery cabinets for long runtime applications

The flexible design of the Liebert® PSI5 allows the UPS to be tower (MT models), 1U rack mountable (1U models), or to be configured as a self-standing tower or to be rack-mounted within a 2U space (RT models). It is available from 750VA to 5000VA with both 120V or 208V models. The Liebert PSI5 UPS features an innovative advanced line-interactive design incorporating buck/boost Automatic Voltage Regulation (AVR) technology. This protects against utility voltage fluctuation by raising and lowering utility power to the level needed by the connected equipment. It also allows the UPS to prolong battery life by maximizing its time on utility power before going to battery.

Product Overview
Power Rating
4250VA / 3825W
Input Voltage
Nominal: 208VAC / Range: 150-281VAC
Output Voltage
208VAC (100/110/115/125 VAC TDU Required)
Up to 96% (Normal Mode)
Input: L6-30P; Output: 4 x L6-30R
Operational Conditions
Operating Temperature
Up to 40C
UL 1778, c-UL-us Listed, FCC Part 15, Class B
Line-interactive (automatic voltage regulation)
Tools & Selectors
Select, compare, or configure UPS systems and models
Runtime Tool
Get detailed runtime information for various load levels
UPS Selector
Interactive product selector for single-phase UPS
UPS/Battery Upgrade Services
Explore options to maintain Liebert® GXT & PSI UPS

Find Your Area Contact

Products Support Contacts

Showing contacts for Virginia, 20149, USA Change
Vertiv (Liebert Services)
+1 800 543 2378
610 Executive Campus Drive Westerville Ohio 43082 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, Thermal Management, Integrated Solutions, Racks and Containment

Additional Resources


How Do You Select a UPS for Power Backup?

Your specific needs should determine your IT power decision. Selecting a UPS for your particular application requires an examination of a number of factors. The load size, location and criticality of the equipment to be protected are key, as well budgetary considerations, when choosing a UPS for power backup.


Power Continuity Services Selector: Renew and Maintain Your Vertiv Single-Phase UPS Population

Power Continuity Services offers flexible and complete lifecycle power renewal options for Liebert® GXT and Liebert® PSI UPS systems. This comprehensive program ranges from customer battery replacement to full-service replacement of battery and UPS with service contracts. Utilize this selector to identify what options are available for your equipment.

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