Vertiv AS4D0NCXGNNXLKB 20kVA Scalable Modular UPS with N+1 Redundancy
Overview
The Vertiv AS4D0NCXGNNXLKB is a 20kVA/18kW scalable modular uninterruptible power supply engineered for data centers, server rooms, and critical infrastructure environments where a single point of failure is not an option. Rated at up to 20kVA with N+1 redundancy built in, this unit is designed to keep essential loads online through utility interruptions, brownouts, and power quality events — without requiring a parallel external bypass cabinet or a secondary UPS chassis. If you're sizing power protection for an edge deployment, a mid-tier enterprise stack, or a surveillance and access control infrastructure room, the AS4D0NCXGNNXLKB is worth a close look before you commit to a static, fixed-capacity unit.
For a broader view of the Vertiv power and thermal management catalog, including complementary PDUs, transfer switches, and remote monitoring gear, the Vertiv line covers most of what a modern machine room needs end-to-end.
Key Features
- 20kVA / 18kW N+1 Power Capacity: The N+1 redundancy architecture means one power module can fail or be hot-swapped for maintenance while the remaining modules continue carrying the full load — no scheduled maintenance window, no planned downtime. For a UPS and power protection deployment where availability SLAs are in play, this changes the maintenance calculus significantly compared to a monolithic single-module unit.
- 208VAC Input, 208/120VAC Output: Accepts standard 208VAC three-phase or single-phase commercial feed and outputs both 208VAC and 120VAC simultaneously. This dual-output capability means a single UPS chassis can serve mixed-voltage rack loads — servers and networking gear at 208V, while 120V legacy equipment or PDUs tap off the same inverter without a step-down transformer in the circuit.
- Up to 92% Efficiency: At peak operating efficiency, only 8% of drawn power is lost to heat. In a 20kW protected load scenario running 24/7, that efficiency delta versus a less efficient unit (say, 85%) translates to roughly 1,400W less waste heat per hour — meaningful for both energy cost and cooling load in a space-constrained IDF or edge enclosure.
- Scalable Architecture: The 'scalable to 20kVA' designation means capacity can be grown incrementally as load requirements increase, rather than purchasing a fully loaded chassis upfront. This is the right approach when a deployment starts at 40–50% utilization and is expected to grow over 18–36 months — defer capital on modules you won't use today.
- 3-Wire Wiring Configuration (L-L-G): The line-line-ground wiring topology is compatible with standard commercial single-phase 208V distribution panels, which simplifies the input feed design. Electricians familiar with standard commercial wiring won't need to accommodate exotic input requirements — reducing both installation complexity and the risk of field wiring errors.
- 0°C to 40°C Operating Temperature Range: Rated to operate in environments up to 40°C (104°F), the AS4D0NCXGNNXLKB tolerates the ambient thermal conditions typical of a lightly air-conditioned IDF closet or an edge compute cabinet where full precision cooling isn't always available. The 0°C lower bound also covers cold-start scenarios in unheated utility or warehouse spaces.
- Physical Footprint — 49" H × 17" W × 34" D, 920 lbs: At 17 inches wide, this unit is designed for a standard 19-inch equipment rack bay or a matched Vertiv enclosure. The 34-inch depth and 920-lb shipping weight are non-trivial — floor loading and rack structural ratings need to be verified before install, and a lift or pallet jack will be required for positioning. Plan the floor path before delivery day.
Integration & Compatibility
The 208/120VAC output configuration integrates directly with standard North American commercial electrical infrastructure without additional transformer stages. The L-L-G three-wire input is compatible with most commercial distribution panels fed from a 208VAC service. For environments running a managed network switching stack or a converged security and IT infrastructure, the dual-voltage output simplifies power distribution across mixed-voltage racks without adding external step-down hardware.
For deployments where the UPS feeds a video surveillance or physical security infrastructure — NVR arrays, IP camera PoE switches, access control servers — the N+1 architecture directly supports the continuous-operation requirement that most enterprise security policies mandate. Pair with a compatible rack enclosure rated for the 920-lb load to ensure structural integrity and cable management meet the installation requirements.
Consult a licensed electrical contractor for input feed sizing, breaker coordination, and local code compliance before commissioning. At 20kVA, the branch circuit and breaker sizing requirements are above the threshold where DIY electrical work is advisable or code-compliant in most jurisdictions.
Frequently Asked Questions
Q: What is the maximum power output of the AS4D0NCXGNNXLKB?
A: The AS4D0NCXGNNXLKB is rated at up to 20kVA / 18kW in N+1 redundancy configuration. This is the protected load capacity available to connected equipment when all modules are operating normally.
Q: What input voltage does the AS4D0NCXGNNXLKB require?
A: The unit accepts 208VAC input using a 3-wire (L-L-G) wiring configuration, compatible with standard commercial 208V single-phase distribution panels.
Q: What output voltages does the AS4D0NCXGNNXLKB provide?
A: The AS4D0NCXGNNXLKB outputs both 208VAC and 120VAC, allowing a single chassis to power mixed-voltage loads simultaneously without an external step-down transformer.
Q: What does the N+1 redundancy mean in practice for the AS4D0NCXGNNXLKB?
A: N+1 means one power module can be removed, fail, or be serviced while the remaining modules continue to carry the full protected load. This enables maintenance without taking the protected equipment offline.
Q: What are the weight and dimensions of the AS4D0NCXGNNXLKB?
A: The unit measures 49 inches tall, 17 inches wide, and 34 inches deep, and weighs 920 lbs. Floor load ratings and rack structural capacity must be verified before installation. A pallet jack or mechanical lift will be required for positioning.
Q: What is the operating temperature range of the AS4D0NCXGNNXLKB?
A: The unit is rated for 0°C to 40°C (32°F to 104°F) ambient operating temperature, suitable for standard commercial equipment rooms and edge deployments with limited precision cooling.
The AS4D0NCXGNNXLKB sits in a practical sweet spot for mid-market critical power — the 20kVA/18kW N+1 architecture gives you the redundancy story that enterprise procurement requires without the footprint and cost of a full modular data center UPS tier. The 92% peak efficiency figure is the one I keep coming back to: at continuous 18kW load, you're dissipating roughly 1,440W less heat than an 84% efficient alternative — that's not trivial when you're trying to hold ambient below 35°C in a space with limited CRAC capacity.
Technical Highlights:
- N+1 Redundancy at 20kVA: One module can fail or be pulled for service with zero impact on protected load — eliminates the scheduled maintenance window that single-module static UPS units require.
- Dual-Voltage Output (208V + 120V): Simultaneous 208VAC and 120VAC output from a single chassis simplifies rack power distribution in mixed-voltage environments without introducing a lossy step-down transformer stage.
- 3-Wire L-L-G Input at 208VAC: Standard commercial wiring topology — electricians don't need exotic panel configurations, and the input feed can be served directly from a standard 208V commercial distribution panel with a correctly rated breaker.
Deployment Considerations:
- At 920 lbs, the floor loading calculation is non-negotiable before positioning. Raised-floor deployments need to verify tile and stringer ratings; slab floors in IDF closets need to confirm the point load doesn't exceed local building structural limits. Get this signed off by a structural engineer if there's any question.
- The 40°C upper operating temperature limit sounds generous, but in a sealed rack row with a failing CRAC unit, ambient can exceed that faster than you'd expect. If this UPS is protecting life-safety or 24/7 surveillance systems, pair it with an independent environmental monitor that alerts before thermals become a problem, not after.
This unit is well-matched for a mid-size enterprise security operations center or a primary data closet feeding a converged IP surveillance and access control infrastructure — anywhere the availability requirement is 99.9%+ and a maintenance-induced outage would trigger an incident report. It's overkill for a single-rack edge closet under 5kW; it's undersized for a multi-row data hall. Know your load profile before you buy.
