The Vertiv Liebert GXT3 is an online double-conversion UPS series built for true voltage conditioning and pure sine wave output. The model we stock is the 1000VA / 900W GXT3-1000MT120 in a compact mini-tower form factor — genuine Vertiv hardware, shipped from our Canadian warehouse.
Ships in 2–4 weeksThe Liebert GXT3 is Vertiv's compact online double-conversion UPS line, designed for equipment that needs clean, continuously regulated power rather than the brief transfer of a line-interactive unit. In a true online topology the connected load always runs from the inverter, so incoming voltage is conditioned and isolated end to end and the output is a pure sine wave. That makes the GXT3 a fit for network closets, edge cabinets, point-of-sale and small server or telecom loads where power quality matters as much as runtime.
The GXT3 family spans several capacities and form factors across its full Vertiv lineup; the model we carry is the 1000VA / 900W GXT3-1000MT120, the compact mini-tower variant. Below is the model we stock. If your sizing lands above this point, see the full range below or reach out and we'll match a unit to your load.
| Model | VA / W | Topology | Form factor | Runtime ½ / full | Outlets |
|---|---|---|---|---|---|
| GXT3-1000MT120 | 1000VA / 900W | Online double-conversion | Mini-tower | 15 min / 5 min | 6 × NEMA 5-15R |
See the full range of in-stock GXT3 units below.
VA vs. watts. Size to both numbers. VA (volt-amps) is the apparent-power ceiling and watts is the real-power ceiling; your equipment's total draw must sit under both. The GXT3-1000MT120 is rated 1000VA and 900W, giving a power factor of 0.9 — load it to roughly 900W maximum, not 1000W.
Runtime expectations. On this model you get about 15 minutes at half load and 5 minutes at full load from the internal batteries. That is sized for a clean, automatic shutdown or to bridge a short outage. If you need to ride through longer outages, the GXT3 supports extended battery cabinets to lengthen runtime.
Online vs. line-interactive. The GXT3 is fully online double-conversion. Choose it over a line-interactive UPS when your load is sensitive to voltage fluctuation, when you run generators or unstable mains, or when zero transfer time matters. For less critical desktop loads a line-interactive unit may be enough.
Mini-tower footprint. The GXT3-1000MT120 is the compact mini-tower variant, sized to sit on a shelf, desk or floor in a network closet or small equipment room. If you need a rack-mount unit, the GXT3 line also offers rack/tower (RT) models in the same capacity — ask us and we'll point you to the right SKU.
The GXT3-1000MT120 carries a 2-year manufacturer warranty. Every unit is genuine Vertiv hardware held in and shipped from our Canadian warehouse, so you avoid cross-border duties and delays and get local support on sizing and setup.
Already running a GXT3 and just need fresh cells? See our Vertiv Liebert replacement battery hub for the matching GXT3 battery kits, or browse the full Vertiv Liebert brand range.
Is the Liebert GXT3 a true online UPS?
Yes. The GXT3 is online double-conversion, so the load always runs from the inverter and the output is a regulated pure sine wave with no transfer time.
How much can I plug into a GXT3-1000MT120?
Up to 900W of real power (1000VA apparent). Keep your total connected load under both figures.
How long will it run during an outage?
About 15 minutes at half load and 5 minutes at full load on internal batteries. Add an extended battery cabinet for longer runtime.
Can it mount in a rack?
The GXT3-1000MT120 is the mini-tower (MT) variant and is designed to stand as a tower; it is not a rack-mount unit. If you need rack mounting, the GXT3 line offers rack/tower (RT) models in the same capacity — contact us and we'll match the right SKU.
Can I replace the batteries myself?
Yes. The GXT3 uses hot-swappable batteries, so cells can be replaced without powering down the connected equipment.
UPSPLUSBATTERY is an authorized Canadian reseller of genuine Vertiv Liebert UPS systems; Vertiv, Liebert and model names are trademarks of their respective owners.
Shop the Vertiv Liebert GXT3 lineup — the third-generation Liebert online double-conversion UPS deployed across server cabinets, network rooms, and small-tier data center loads. Models include Liebert GXT3-1000MT120 1kVA, GXT3-3000RT (3kVA), GXT3-5000 (5kVA), GXT3-6000 (6kVA), GXT3-10000 (10kVA) plus 230V international and rack/tower convertible variants.
GXT3 highlights: double-conversion online topology, pure sinewave output, optional Vertiv Liebert IntelliSlot SNMP cards (RDU101, IS-WEBADPT), hot-swap battery modules, tower/rack convertible chassis on most models, 0.9 power factor, internal static bypass.
The GXT3 platform was succeeded by GXT4 (~2014) and GXT5 (~2020). For modernization to current Vertiv platforms contact GDF Technologies. Replacement battery? See our Vertiv Liebert GXT3 Replacement Batteries.
Our Canadian team has specified APC, Eaton, Tripp Lite, Vertiv, Mitsubishi, Toshiba, CyberPower, XPC, and Delta UPS for healthcare, data centres, and government. Enquiries answered in business hours.