Liebert® PSI5-1100MT120, Liebert® PSI5 Mini Tower UPS, 1100VA/990W, 120V

The Vertiv™ Liebert® PSI5 uninterruptible power supply (UPS) is designed to protect and extend the life of your electronic devices in school, home and office. This 1100VA UPS tower offers cost-effective protection from downtime and damage caused by power outages, brownouts, sags, surges or noise interference. Automatic Voltage Regulation (AVR) extends battery life and safeguards critical equipment. Voltage regulation is from 83 to 159 VAC without using the battery.


  • Advanced, pure sine wave output power on battery
  • 0.9 power factor, which means more usable power for connected devices
  • Voltage regulation from 83 to 159 VAC without using the battery
  • Less than 6 milliseconds transfer time to battery
  • Plug-and-play solution requires no installation and no rack space
  • RJ-45 for data line surge protection
  • Options for communication card for remote monitoring of devices.


  • Offers a plug-and-play battery backup that does not require installation or rack space.Options for communication card for remote monitoring of devices.
  • With advanced pure sine wave output, the Vertiv™ Liebert® PSI5 UPS compensates for power fluctuations, protects against equipment damage, and prevents data loss during a power disturbance.
  • ‌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.
  • Eligible for the Vertiv™ Trade-In Program. Contact a Vertiv partner for discount rates and to calculate your savings
  • Not for sale in Vermont.