APC by Schneider Electric GVSUPS20K100B3H 20kW Isolation Transformer UPS 480V Input / 400V Output

Overview

The APC by Schneider Electric GVSUPS20K100B3H is a 20 kW three-phase uninterruptible power supply from the APC Galaxy VS line, engineered for facilities that need to step down 480V utility input to a protected 400V output while isolating the load from grid anomalies. The built-in input isolation transformer is not an optional add-on — it is integral to this configuration, making GVSUPS20K100B3H the correct SKU when your distribution panel runs at 480V but downstream equipment operates at 400V. That voltage-translation requirement is common in mixed North American / IEC installations: medical imaging suites, industrial process controls, and data center rows that blend North American switchgear with European-rated servers or UPS bypass panels.

Support for up to three internal battery strings gives the system meaningful runtime scalability without requiring external battery cabinets for moderate autonomy requirements. Installation provisions include seismic anchoring, Emergency Power Off (EPO) connectivity, Remote Alarm Panel support via GVSOPT036, and Modbus communications — all documented in the 990-91500B-001 installation guide published by Schneider Electric. Browse the full range of commercial UPS systems to compare runtime and scalability options across the portfolio.

Key Features

• 20 kW / 480V-to-400V Conversion: Handles the full step-down from North American 480V distribution to IEC 400V equipment voltage in a single unit — eliminates the need for a separate isolation transformer and a separate UPS, reducing floor footprint and single points of failure.
• Integrated Input Isolation Transformer: Galvanically isolates the load from the utility source, suppressing common-mode noise and preventing ground-fault currents from propagating upstream. Critical in environments where sensitive imaging or medical equipment cannot tolerate neutral-to-ground voltage.
• Up to Three Internal Battery String Capacity: Runtime scales without adding external cabinets up to the three-string limit — useful for IT closets and equipment rooms where floor space is constrained and a single enclosure solution is preferable for maintenance simplicity.
• Emergency Power Off (EPO) Interface: Hardwired EPO connectivity allows facility safety systems or fire suppression panels to cut UPS output immediately — a code requirement in many data center and healthcare installations. Wiring is covered in the installation guide signal-cable section.
• Modbus Communications: Native Modbus support integrates the UPS into building management systems (BMS) and SCADA environments without requiring a separate protocol gateway — relevant for industrial facilities already running Modbus RTU or TCP over their automation network.
• Remote Alarm Panel Support (GVSOPT036): Optional remote alarm panel connection lets facilities mount status indicators in a guard station or operations center, keeping maintenance staff informed without requiring physical presence at the UPS enclosure.
• Seismic Anchoring Provision: The installation guide includes a dedicated seismic anchoring procedure — relevant for deployments in seismic zones or facilities that must meet IBC or OSHPD anchoring requirements. Plan for anchor bolt placement before the unit arrives on site.

Integration & Compatibility

The GVSUPS20K100B3H is designed for integration into facilities running 480V three-phase distribution — typical of North American commercial buildings, manufacturing floors, and healthcare campuses. The 400V output feeds downstream equipment directly, making it compatible with IEC-rated server racks, European-sourced automation gear, and dual-voltage PDUs. Modbus connectivity supports integration with network management and BMS platforms that poll UPS status for power chain visibility. If your infrastructure includes additional APC Galaxy VS accessories such as extended battery modules or bypass panels, verify compatibility against the Galaxy VS configuration matrix on the Schneider Electric product portal. For facilities evaluating full power chain design — from upstream transfer switches through UPS to rack-level PDUs — pre-sales engineering consultation is recommended before finalizing the single-line diagram. Review APC power protection solutions for compatible distribution and switching options.

Frequently Asked Questions

Q: What is the difference between the GVSUPS20K100B3H and a standard Galaxy VS 20kW without a transformer?

A: The GVSUPS20K100B3H includes a factory-integrated input isolation transformer that steps the input voltage down from 480V to 400V output. A standard Galaxy VS 20kW without this designation does not include the transformer and is intended for matched input/output voltage scenarios. Select GVSUPS20K100B3H when your utility feed is 480V and your downstream equipment is rated for 400V.

Q: How many battery strings does the GVSUPS20K100B3H support internally?

A: The unit supports up to three internal battery strings. This allows runtime to be scaled within the same enclosure without adding external battery cabinets, up to the three-string limit documented in the Schneider Electric installation guide (990-91500B-001).

Q: Does the GVSUPS20K100B3H support EPO (Emergency Power Off)?

A: Yes. The installation guide documents a dedicated EPO signal cable connection, allowing the UPS to be integrated with facility safety or fire suppression systems for immediate load shutdown when required.

Q: What communications protocols does the GVSUPS20K100B3H support?

A: The unit supports Modbus communications, documented in the installation signal-cable section. This allows integration with building management systems (BMS) and SCADA platforms. External network communications can be added via compatible Schneider Electric network management cards.

Q: Does the GVSUPS20K100B3H require seismic anchoring?

A: The installation guide includes a seismic anchoring procedure as an option. Whether anchoring is required depends on local building codes and the seismic zone classification of your facility. Plan anchor bolt placement in the floor slab before the unit is delivered, as retrofitting is significantly more difficult once the unit is positioned.

Karl Wilson

The GVSUPS20K100B3H comes up regularly in projects where the facility's 480V distribution backbone needs to feed IEC 400V equipment without a separate step-down transformer inline — the integrated isolation transformer in this Galaxy VS configuration handles both functions in one enclosure, which simplifies the single-line diagram and removes one more maintenance point from the power chain. It's a specific-use SKU, not a general-purpose UPS, and getting that distinction right before the order is placed saves a costly return.

Technical Highlights:

• 480V Input / 400V Output: Correct for North American 480V switchgear feeding European-rated or IEC-standard equipment — covers medical imaging, industrial automation, and mixed-voltage data center rows without a separate transformer.
• Up to Three Internal Battery Strings: Scales runtime within a single cabinet, avoiding the complexity and additional maintenance contracts that come with external battery enclosures for moderate autonomy requirements.
• Modbus + EPO Signal Integration: Both are documented in the 990-91500B-001 installation guide — Modbus for BMS polling, EPO for code-required emergency shutdown. Wire both during initial installation; retrofitting EPO after commissioning means a full shutdown.

Deployment Considerations:

• Seismic anchoring is a documented installation option — confirm your local IBC or OSHPD requirements before the unit ships and pre-stage anchor bolt locations in the slab. A 20 kW UPS with transformer is a substantial floor load and cannot be easily repositioned once set.
• The 400V output is IEC-standard, not North American 120/208V — confirm that every downstream load is rated for 400V before energizing. Mixed-voltage assumptions are the most common commissioning error on this type of installation.

The GVSUPS20K100B3H is the right specification for healthcare campuses, manufacturing floors, or enterprise data center edge rooms running 480V distribution with a requirement to protect 400V IEC-rated equipment — environments where the transformer and UPS functions need to be in a single, seismically anchorable, BMS-integrated enclosure.