APC by Schneider Electric GVSUPS20KB4FS-A 20kVA 3-Phase Double-Conversion Tower UPS
Overview
The APC by Schneider Electric Galaxy VS is a 20kVA three-phase, double-conversion online UPS built for mid-scale commercial and industrial power protection — think data center edge deployments, network operations rooms, and large-format security infrastructure where a momentary dropout is not a recoverable event. The GVSUPS20KB4FS-A (often searched as GVSUPS20KB4FS A) ships in a tower form factor at 208V AC input and delivers true online double-conversion with 0ms transfer time, meaning connected equipment never experiences a transition to battery — there is no switchover at all.
At 1,014 lbs and standing 58.5 inches tall with a 20.5 × 33.4 inch footprint, this is purpose-built infrastructure — not a rack-slide-in. Budget accordingly for floor loading, conditioned space, and a professional commissioning crew. The UPS and power protection category covers complementary units and accessories if you are scaling a larger protected infrastructure.
Key Features
- Double-Conversion Online Topology (0ms Transfer Time): The Galaxy VS never switches to battery — it continuously rectifies AC to DC and inverts back to clean AC, so a sag, spike, or full utility outage registers as zero disruption to connected loads. This is the spec that separates it from line-interactive units in environments where even a sub-cycle event can corrupt a transaction or crash a storage controller.
- 20kW / 20kVA at Three-Phase 208V: Sized for mid-density server rooms, large NVR/storage arrays, or multi-rack network closets. Three-phase input (208V AC, 177–239V AC range) handles typical North American commercial distribution without a step-down transformer.
- Output Voltage Flexibility (200 / 208 / 220V AC): Selectable output voltage allows you to match the protected loads precisely — useful in mixed-equipment rooms where some gear is rated 200V and other equipment expects 220V.
- 2 × 9Ah Smart Modular Battery Strings: The two internal 9,000mAh battery modules deliver 10.5 minutes at full load and 26.5 minutes at half load — standard targets for generator-start sequences. The modular smart battery design supports hot-swap replacement, keeping the unit online during battery maintenance without requiring a scheduled downtime window.
- SNMP/Modbus + SNMP/HTTP Network Management: Native SNMP and Modbus integration means this unit fits directly into a BMS, DCIM, or enterprise NMS without a bolt-on adapter. HTTP-based management adds browser-accessible status for teams without a dedicated SNMP polling infrastructure.
- 480V DC Bus Voltage: The 480V DC internal bus is a design characteristic of higher-capacity Galaxy-series units — it allows efficient energy transfer across the conversion stages and is part of what keeps input-to-output efficiency competitive at partial loads typical in real-world deployments.
- 61 dB(A) Sound Emission: At 61 dB(A), this unit is audible but not oppressive in an enclosed equipment room. It is not suitable for open office adjacency without acoustic treatment — plan accordingly when locating it outside a dedicated electrical or server room.
- Pure Sine Wave Output: All connected equipment receives a clean, utility-grade sine wave regardless of what the input looks like. This matters for variable-frequency drives, medical-grade equipment, and any load that rejects modified-wave input.
- Operating Envelope: Up to 40°C / 3,229 ft: The 40°C (104°F) maximum operating temperature provides margin in equipment rooms that lose cooling temporarily. The 3,229 ft altitude ceiling should be verified against installation site — sites above this elevation derate the unit's capacity and may require a derating discussion with the manufacturer.
Integration & Compatibility
The GVSUPS20KB4FS-A connects to building management and IT monitoring systems via SNMP (v1/v2/v3 depending on management card configuration) and Modbus RTU/TCP. The HTTP interface provides direct browser access for local or remote monitoring. Network management card options for the Galaxy VS platform extend protocol support — verify the card variant included with this specific unit before assuming full protocol coverage.
For teams deploying this alongside networked security infrastructure, pair it with a properly sized PoE network switch on the protected output to ensure cameras, access control panels, and intercoms remain powered through grid events. The APC by Schneider Electric power protection line includes external battery modules for runtime extension if 10.5 minutes at full load is insufficient for your generator start sequence.
Thermal dissipation is rated at 1,276.62W — adequate ventilation clearance and a properly sized HVAC load calculation are prerequisites before commissioning. A UPS runtime and battery planning guide is a useful reference when sizing battery extension modules for longer hold times.
Frequently Asked Questions
Q: What is the runtime of the GVSUPS20KB4FS-A at full load?
A: At full 20kW load, the two internal 9Ah battery modules provide approximately 10.5 minutes of runtime. At half load (10kW), runtime extends to approximately 26.5 minutes. For longer hold times, external battery modules compatible with the Galaxy VS platform can extend runtime — verify compatibility with the manufacturer before purchasing extension modules.
Q: Does the GVSUPS20KB4FS-A support hot-swap battery replacement?
A: Yes. The Galaxy VS uses a smart modular battery design that supports battery replacement while the unit remains online, eliminating the need to schedule a downtime window for routine battery maintenance.
Q: What is the transfer time on the GVSUPS20KB4FS-A?
A: Zero milliseconds. The double-conversion online topology means connected equipment is continuously powered from the inverter output — there is no transfer event when utility power fails or degrades. This distinguishes it from line-interactive designs that have a 2–6ms switchover delay.
Q: What network management protocols does the GVSUPS20KB4FS-A support?
A: The unit supports SNMP and Modbus for integration with BMS, DCIM, and NMS platforms, plus SNMP/HTTP for browser-based monitoring. This enables direct integration into most enterprise monitoring environments without third-party gateways.
Q: Is the GVSUPS20KB4FS-A suitable for installation above 3,000 feet elevation?
A: The specified maximum operating elevation is 3,229 ft (984m). Installations above this altitude will derate the unit's rated capacity — consult the manufacturer's derating specifications for your specific elevation before finalizing the installation design.
Q: What warranty comes with the GVSUPS20KB4FS-A?
A: The unit carries a 1-year manufacturer warranty per evidence on file. Extended service and warranty options may be available through APC by Schneider Electric's service programs — verify current options at time of purchase.
The GVSUPS20KB4FS-A is one of the units I recommend when the conversation is about protecting a mid-density security operations center or a multi-rack edge node where a generator is in the plan but the start sequence takes 10–15 seconds. The 0ms transfer time and 10.5-minute full-load runtime are the two numbers that actually govern the design decision here — everything else is secondary.
Technical Highlights:
- 0ms Transfer Time: True double-conversion means there is no battery crossover event — the inverter is always the source. For NVR arrays, access control servers, and networked security appliances, this eliminates the soft-reboot risk that line-interactive units carry on a fast utility dropout.
- Three-Phase 208V Input with 177–239V AC Range: The wide input window means this unit stays online through voltage sag events that would push a narrower-tolerance UPS onto battery prematurely — reducing battery cycle wear in facilities with marginal utility quality.
- SNMP + Modbus Network Management: Direct Modbus integration is the spec that matters most in a BMS-managed facility. You can poll load percentage, battery health, and runtime remaining from the same controller managing HVAC and lighting — no separate UPS management software required.
Deployment Considerations:
- At 1,014 lbs and 1,276.62W of thermal dissipation, this unit requires a structural floor loading assessment and dedicated HVAC capacity calculation before installation — do not treat it as a drop-in swap for a lighter unit in an existing space.
- The 3,229 ft maximum operating elevation is a hard spec limit — installations at higher altitudes derate capacity and may require an oversized unit to compensate. Confirm site elevation before committing to this SKU.
For a physical security operations center running 24/7 NVR recording, managed PoE switching, and access control infrastructure — where a generator is present but 10+ minutes of clean runtime bridges the start gap — the GVSUPS20KB4FS-A is the right capacity class at the right topology for that architecture.
