31Queen Star Series High Frequency Online 10K-20KVA

· Latest Three Level Inverter tech

· True online double conversion technology, Pure Sine Wave Output

· 0.9 Output Power Factor

· Digital LCD Screen,Zero transfer time

· DSPTechnology, compact design

· Active input power factor correction(PFC)

· Protection against all types of power problems

· Wide range of input voltage and frequency

· Active Load Management,cold start function

· Sufficiency Expansion Slots for USB,AS400,CMC monitoring, SNMP,RS485 and EMD environment monitoring

· Equipped with maintenance bypass switch

· Generator Supportable

· Sealed lead acid,maintenance free battery

Three-Phase In, Single-Phase Out—No Transformer, No Hassle

You walk into a building that was wired decades ago—maybe a small factory unit, a medical practice, or an older commercial space. The main panel is three-phase, because that's what the building got when it was built. Then you look at the equipment you actually need to protect: servers, network switches, security DVRs, lab analysers. Every single one of them wants plain, ordinary single-phase power. 230V. 120V. Nothing fancy.

That mismatch is more common than a lot of people expect. The conventional fix involves a separate transformer, extra switchgear, and a whole lot of head-scratching about phase balancing. Or you buy a three-phase UPS and derate it, leaving capacity on the table. Neither option feels clean.

The 31Queen Star Series exists precisely because of this headache. It takes a three-phase input—anywhere from 10kVA to 20kVA—and outputs clean, regulated single-phase pure sine wave power. No external transformer. No phase converter bolted onto the side. No load-balancing spreadsheet. You connect the three-phase feed on one side, and you get the single-phase circuit your equipment actually needs on the other. Done.

True Online Double Conversion: The Grid Never Touches Your Gear

This is a true online UPS, which means it runs in double-conversion mode full-time. Incoming AC gets rectified to DC, filtered, and then rebuilt into a perfect sine wave by the inverter. The output is always regenerated. There's no transfer delay when utility power fails because the inverter never stops. Zero. Your single-phase loads never see a voltage dip, a phase loss, or a frequency wobble from the grid.

For medical imaging equipment, broadcast racks, or server clusters that log every millisecond of power deviation, that's the kind of protection that stops 3 a.m. phone calls.

Three-Level Inverter: Runs Cooler, Lasts Longer

Inside, the 31Queen Star uses three-level inverter technology—the same architecture found in the higher-end Queen Star units. Older two-level designs switch hard between voltage states, generating extra heat and audible noise. Three-level switching smooths that out. The inverter components run cooler. Efficiency ticks up. And the unit doesn't sound like a jet engine spooling up in a quiet office.

It's not the kind of detail that jumps out on a spec sheet, but after a year of continuous operation in an unventilated closet, you'll feel the difference.

0.9 Output Power Factor: Watts That Match Your IT Loads

A 10kVA unit with a 0.7 power factor gives you 7kW of real power. That's a mismatch with modern IT gear, which typically runs power factor corrected supplies close to unity. The 31Queen Star delivers a 0.9 output power factor. A 10kVA unit puts out 9kW. A 20kVA unit puts out 18kW. You're actually using the capacity you paid for.

Active Input Power Factor Correction: Drawing Cleanly from the Three-Phase Supply

When you pull power from a three-phase panel with a large electronic load, harmonic currents can sneak back onto the building's wiring. Enough of that, and you start seeing overheated neutrals, nuisance breaker trips, and interference with other equipment on the same service. The 31Queen Star includes active input power factor correction that keeps the input PF above 0.99. It pulls current cleanly and in phase. The upstream electrical infrastructure doesn't get punished.

Maintenance Bypass: Service Without Downtime

At the 10–20kVA level, shutting down the UPS usually means shutting down everything attached to it. The 31Queen Star has a built-in maintenance bypass switch. When you need to service or swap the unit, you throw the bypass, the load transfers to raw utility (or generator) power, and you can work on the UPS safely without taking your equipment offline. Flip it back when you're done. No rewiring. No downtime window.

Display, Control, and Monitoring

The front panel uses a digital LCD that's straightforward to read—input, output, load, battery, all there without menu diving. Behind the panel, DSP digital control keeps the inverter locked on frequency and voltage regardless of what the grid is doing.

Communication slots cover the usual bases: USB, AS400, RS485, SNMP for network monitoring, and an EMD environment monitoring card if you need temperature and humidity data from the rack. If your existing building management system or NMS can talk to a UPS, there's almost certainly a card that fits.

Cold Start and Generator Compatibility

The 31Queen Star supports cold start, so you can fire it up from battery even with the grid completely dead. In a remote location or during an extended outage where you're running on generator and need to bring the UPS online first, that's useful.

It also handles generator power gracefully. The input voltage and frequency window is wide enough that even a portable generator with sloppy output won't cause the UPS to reject the source and drain its battery. It takes the rough power, runs it through the double-conversion process, and gives your single-phase loads the same clean output they always get.

Sealed Lead-Acid Batteries: No Maintenance Drama

The batteries are sealed, valve-regulated lead-acid—maintenance-free, no watering, no special ventilation requirements. They're the pragmatic choice at this power level. When replacement time comes years down the line, they're widely available and straightforward to swap.

Active Load Management

If you're running close to the unit's capacity, the active load management system keeps an eye on total draw. It can shed non-critical outlet groups in a controlled sequence if the load creeps too high, then bring them back when there's headroom. That prevents a sudden overload from taking down everything.

Who Needs This UPS?

The 31Queen Star is built for the gap between the building's electrical service and the equipment that actually runs the operation. Warehouses where the main panel is three-phase but the office server rack is single-phase. Small manufacturing lines with three-phase feed but single-phase control systems. Medical imaging clinics in older buildings. Broadcast vans and outside broadcast setups that plug into whatever power is available on site.

If you've got a three-phase supply but your critical gear runs on single-phase, you could mess around with external transformers and phase balancing. Or you could install a 31Queen Star and have clean, online-grade single-phase power without any of that. The UPS handles the conversion. You get on with your day.