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Vertiv Liebert PST5 UPS - 660VA/400W 120V Standby Power, 8 Outlets, Battery Backup with Surge Protection, LCD Screen, Energy Star Certified, 3 Year Warranty, Free Shutdown Software (PST5-660MT120)
Vertiv

Vertiv Liebert PST5 UPS

Bottom line: The Vertiv Liebert PST5 UPS: 4 battery-backed plus 4 surge-only outlets, 8 NEMA 5-15R in total; main trade-off: standby topology, not line-interactive or online double-conversion.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ 4 battery-backed plus 4 surge-only outlets, 8 NEMA 5-15R in total
  • ✓ 2 widely spaced outlets fit transformer-block plugs without blocking neighbors
  • ✓ USB link and free shutdown software for automatic, controlled PC shutdown
  • ✓ RJ45/RJ11 ports add surge protection for network and phone lines
  • ✓ 3-year full-unit warranty covers the battery, with advance replacement

Cons

  • ✗ Standby topology, not line-interactive or online double-conversion
  • ✗ 400W ceiling is too low for gaming PCs with high-draw GPUs
  • ✗ Only 4 of the 8 outlets stay powered during an outage
  • ✗ No runtime-at-load figures in the listing; check Vertiv's spec sheet

Manufacturer description

The Vertiv Liebert PST5 UPS (PST5-660MT120) is a 660VA/400W standby battery backup for the gear you can't afford to lose mid-session: a home office desktop, a retro PC build with a fragile hard drive, or your modem and router. When the power surges, spikes or cuts out, it switches to battery. That gives you time to save your work and shut down cleanly instead of risking a corrupted drive. You get eight NEMA 5-15R outlets. Four have battery backup plus surge protection, and four are surge-only for peripherals that don't need to stay on. Two of the outlets are widely spaced, so bulky…

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SpecPicks Verdict

SpecPicks scored Vertiv Liebert PST5 UPS using a rating × review-volume × price-fit model applied to published specs and reviews across the power protection category. Vertiv's power protection lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power protection of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How many outlets on the Vertiv Liebert PST5 stay on during a power outage?

Four of the eight NEMA 5-15R outlets provide battery backup plus surge protection. The other four are surge-only and lose power during an outage, so plug your PC and monitor into the battery side.

Is 660VA/400W enough for my computer?

The PST5 is rated at 660VA/400W. It suits a typical office desktop, retro PC or networking gear. Add up the wattage of everything on the battery outlets and keep the total under 400W. A high-end gaming PC with a power-hungry GPU can exceed that.

Can the PST5 shut down my PC automatically when the power goes out?

Yes. It connects to your computer over USB and works with Vertiv's free downloadable shutdown software, which sends outage notifications and runs a controlled shutdown.

Does it protect my internet or phone line?

Yes. Built-in RJ45/RJ11 ports protect a network or telephone data line from surges, as well as the AC outlets.

What does the warranty cover?

Vertiv provides a 3-year full-unit warranty that includes the battery, with advance replacement. Check Vertiv's site for current claim terms.

Key Features

  • SURGE PROTECTION AND BATTER BACKUP: UPS offers protection during damaging surges, spikes or power outages and USB communications for notifications and controlled shutdown with free software download.
  • 8 OUTLETS: It has 4 surge only and 4 battery & surge outlets; 2 are widely spaced to accommodate transformer-block plugs without covering adjacent outlets.
  • TEL/NETWORK DATA LINE PROTECTION: Surge protection for RJ45/11 for data line surge protection.
  • ENERGY EFFICIENT: This Energy Star certified UPS meets eco-friendly requirements.
  • NO HASSLE WARRANTY: 3-year full unit coverage including battery with advanced replacement warranty.

Full Specifications

BrandVertiv
ColorBlack
Runtime2 minutes
Voltage120 volts
Wattage400 watts
Amperage5.5
8 OUTLETSIt has 4 surge only and 4 battery & surge outlets; 2 are widely spaced to accommodate transformer-block plugs without covering adjacent outlets.
Unit Count1 Count
Form FactorTower
ConnectivityUSB
Model NumberPST5-660MT120
Input Voltage120 volts_of_alternating_current
Maximum Power400 watts
Built-In MediaUPS Unit^USB Type A to USB Type B, 2 meter (~6.5 ft) in length
Connector TypeNEMA
Item Type NameUninterrupted Power Supply
Output Voltage120 volts
Output Wattage400
Item Dimensions3.82 x 6.24 x 3.82 inches
Mfr Part NumberPST5-660MT120
Full listing titleVertiv Liebert PST5 UPS - 660VA/400W 120V Standby Power, 8 Outlets, Battery Backup with Surge Protection, LCD Screen, Energy Star Certified, 3 Year Warranty, Free Shutdown Software (PST5-660MT120)

Ready to buy?

Vertiv Liebert PST5 UPS - 660VA/400W 120V Standby Power, 8 Outlets, Battery Backup with Surge Protection, LCD Screen, Energy Star Certified, 3 Year Warranty, Free Shutdown Software (PST5-660MT120) is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Vertiv Liebert PST5 UPS - 660VA/400W 120V Standby Power, 8 Outlets, Battery Backup with Surge Protection, LCD Screen, Energy Star Certified, 3 Year Warranty, Free Shutdown Software (PST5-660MT120)
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