GS400 Offline UPS 400VA 240W Standby Power Supply for PC & POS

Reliable 400VA Standby UPS for PC, POS and CCTV

The GS400 is ulinkeep’s entry-level 400VA standby UPS (offline UPS) for small offices, retail counters and surveillance corners. Rated 400VA / 240W, it keeps a desktop PC, cash register or DVR alive through short blackouts — long enough to save files, close transactions and shut down cleanly. The whole unit weighs about 4 kg in a compact black tower, so it tucks under a desk or beside a weak-current cabinet without taking up space.

The front panel carries an LCD (an LED-indicator version is optional) that shows input voltage and battery status in real time, next to a round power button. This 400VA standby UPS works as a plug-and-play uninterruptible power supply (UPS): select 110Vac or 220Vac input to match your regional grid, plug it in and switch on. FCC, CE and RoHS certifications are in place for global distribution.

Need other capacities? The same standby series covers the GF400 400VA offline UPS, the GP800 800VA offline UPS and the GS1000 1000VA offline UPS, so you can standardize on one product family from 400VA to 1000VA.

10 ms Transfer Time and Full-Function Protection

When the mains fails, this 400VA standby UPS switches to battery in about 10 ms — fast enough that a standard desktop PC rides through without a reboot. Full-function protection covers short circuit, overload, overcharge, over-discharge and overvoltage, and a 250Vac/10A breaker on the rear panel adds a hardware-level safety cut-off. The unit also supports cold start (powering up on battery alone), off-mode charging (topping the battery even with the UPS switched off) and auto-restart when AC recovers, so a whole office full of unattended machines comes back online by itself after a trip-out.

AVR Boost and Buck Regulation for Unstable Grids

In regions where the grid swings between brownout and overvoltage, the built-in AVR (automatic voltage regulation) corrects the output before the battery is even touched: low mains is boosted and high mains is bucked automatically. That means fewer battery cycles, longer backup life and steadier equipment operation. For buyers in areas with unstable mains, this 400VA standby UPS doubles as an everyday voltage stabilizer, not just an emergency backup — the microprocessor control guarantees consistent regulation across the whole 400–2000VA series.

Battery, Charging and Real-World Runtime

Inside is a built-in lead-acid battery charged at 1A, reaching full charge in about 8 hours. One ordinary desktop PC runs for roughly 6–10 minutes on a full charge — the mission here is graceful shutdown of POS terminals, DVRs and office PCs, not hours of full-load runtime. In battery mode the output is a modified sine wave, which is compatible with switching-type loads such as PCs, monitors, cash registers and networking gear. Battery packs are cycle-tested and capacity-checked before shipment on OEM orders.

Metal Case, Side Ventilation and Rear-Panel I/O

The all-metal chassis is sturdier than plastic entry units and better at shedding heat: one-piece side ventilation grilles discharge operating heat during long standby and battery runs. The rear panel concentrates everything a small installation needs from a 400VA standby UPS — 4 universal output sockets that accept most regional plug types, an optional USB communication port for monitoring and graceful shutdown, the AC input socket and the 250Vac/10A breaker, all on one panel.

Application Scenarios and OEM Plug Options

Typical deployments for this 400VA standby UPS: SME offices keep front-desk PCs, monitors and printers alive through trips; chain-store POS runs cash registers, scanners and receipt printers so trading never stops; surveillance rooms back up DVR/NVR and small switches so recording continues during grid maintenance; education PC labs and clinics batch-deploy it where the budget is tight but basic protection is a must.

For branding buyers, GS400 OEM projects are already shipping: one European PC channel took EU-standard sockets (12+ country plug types available) with cycle-tested battery packs; a Dubai trader took neutral color boxes and drop-test golden samples for repeat orders. Customization depth covers four tiers — minor (logo silk-screen), drawing-based, sample-based and full customization (power segment, socket standard, voltage output). Packaging and logo customization start at 500 sets; design in 3 days, samples in 7 days, 12-month warranty with free replacement parts and online technical support.

Specifications

Frequently Asked Questions