Vertiv SR2N04020NAA2 4-Rack 20kW Prefabricated Data Center Row with Fire Suppression

Overview

The Vertiv SR2N04020NAA2 is a 20kW, 4-rack prefabricated data center row solution built for organizations that need a fully integrated, fire-suppression-equipped compute environment without the lead time and complexity of a ground-up build. Configured as four 42U × 600 × 1400 mm racks across a 3,900 mm row, the SR2N04020NAA2 ships as a tested, matched assembly — power distribution, cooling, and fire suppression are already sized and paired at the factory, reducing field commissioning risk and cutting the variables that typically blow out IT infrastructure deployments.

This is not a generic rack kit. It is a pre-engineered power and cooling system at 20kW total capacity (5kW per rack) with a 20kW PMC distribution architecture and factory-integrated data center infrastructure. The fire suppression system differentiates this SKU from the NAA1 family — if your facility, insurance policy, or local code requires in-row suppression, this is the configuration to specify.

Key Features

• 20kW Total Power Capacity: 20 kilowatts shared across 4 racks at 5kW per rack — appropriate for mid-density compute loads like blade chassis, hyperconverged nodes, or edge aggregation. If your planned average rack density exceeds 5kW, you will need to rebalance or step up to a higher-density configuration before deployment.
• 4 × 42U Rack Enclosures (600 × 1400 mm): 42U height gives you full-depth server clearance in a 600mm-wide, 1400mm-deep footprint — the 1400mm depth accommodates most 2-post and 4-post server profiles, including deep storage arrays, without forced cable management compromises.
• 3,900 mm Row Footprint: At 3.9 meters end-to-end, this 4-rack row fits neatly in a 4-meter aisle bay — leave 100mm of service clearance planning on each end. The fire suppression cabinet adds to the total row length compared to the equivalent NAA1 configuration (3,300 mm), so measure your floor plan against the NAA2 dimension, not the base SKU.
• Integrated Fire Suppression System: The factory-fitted suppression system covers the row enclosure as a unit. This is the key distinction between the SR2N04020NAA2 and the SR2N04020NAA1 — same power and cooling profile, but the NAA2 suffix signals the suppression cabinet is present. For facilities with AHJ requirements or insurance riders mandating in-rack suppression, this eliminates the field-retrofit problem entirely.
• 1 Cooling Unit: A single integrated cooling unit manages the 20kW heat load across all four racks. This is a non-redundant cooling configuration — the SR2N04020PAA2 (same capacity, also fire-suppression equipped) provides dual PDU runs per rack, and the FAA2 suffix adds a second cooling unit for N+1 thermal redundancy if uptime requirements demand it.
• 4 × 30A PDUs: Four 30A power distribution units — one per rack — feed the row. The 20kW PMC (Power Management and Control) distribution type provides metered, managed power visibility across the configuration. Each rack gets its own dedicated PDU circuit, which simplifies load balancing and isolates power faults to a single enclosure rather than cascading across the row.
• 20kW PMC Distribution: The Power Management and Control architecture enables centralized power monitoring at the row level. This is meaningful in edge and colocation scenarios where remote power reporting is required without a separate power monitoring appliance layered on top.

Integration & Compatibility

The SR2N04020NAA2 is part of Vertiv's broader Vertiv prefabricated infrastructure lineup. The SR2 series uses consistent 42U × 600 × 1400 mm rack dimensions across all configurations, so standard EIA-compliant rail kits, cable managers, and blanking panels integrate without modification. PDU inlet connections follow the 30A convention across the series — verify your facility feed breaker sizing matches before ordering.

For facilities evaluating the right row size, the SR2 family scales from 2-rack/10kW (SR2N02010NAA2 at 2,700 mm) up to 5-rack/20kW (SR2N05020NAA2 at 4,500 mm). The 4-rack NAA2 row at 3,900 mm sits between the 3-rack (SR2N03020NAA2, 3,300 mm) and 5-rack options — useful context when you are constrained by aisle length but need more than 3 racks. Consult your data center power planning documentation to confirm facility feed capacity before specifying the 20kW row tier.

When This Is the Correct Choice

Specify the SR2N04020NAA2 when four conditions are true: (1) your total IT load across the row is at or under 20kW, (2) per-rack density stays at or below 5kW, (3) your facility or regulatory environment requires in-row fire suppression, and (4) you are running a non-redundant cooling topology. Typical fits include edge data centers in manufacturing or distribution facilities, small colocation pods, and enterprise branch consolidations where the row is the entire compute footprint and local fire code drives the suppression requirement.

When to Choose a Different Model

If cooling redundancy is non-negotiable — mission-critical workloads where a single cooling unit failure would trigger a service event — move to the SR2N04020FAA2, which adds a second cooling unit to the same 4-rack, 20kW, fire-suppression-equipped frame. If you don't need fire suppression and can use the 600mm shorter row footprint (3,300 mm vs 3,900 mm), the SR2N04020NAA1 delivers the same power and cooling profile without the suppression cabinet. If your per-rack density exceeds 5kW on average, the 4-rack 20kW row will be undersized — consider a higher-density Vertiv configuration rather than accepting a thermally marginal deployment.

Frequently Asked Questions

Q: What is the difference between the SR2N04020NAA2 and SR2N04020NAA1?

A: The NAA2 suffix indicates the row includes an integrated fire suppression system. The NAA1 variant is identical in power capacity (20kW), rack count (4), cooling units (1), and PDU count (4 × 30A), but does not include fire suppression. The NAA2 row is also 600mm longer (3,900 mm vs 3,300 mm) to accommodate the suppression cabinet.

Q: What is the per-rack power allocation on the SR2N04020NAA2?

A: Each of the four racks receives 5kW of power capacity. The total 20kW is distributed equally — plan your server loads accordingly. If any single rack in your design exceeds 5kW average draw, this row configuration will be undersized for that enclosure.

Q: Does the SR2N04020NAA2 include cooling redundancy?

A: No. This configuration includes one cooling unit. For N+1 cooling redundancy in a fire-suppression-equipped 4-rack row, the SR2N04020FAA2 provides a second cooling unit in the same 20kW frame.

Q: How many PDUs are included, and what type?

A: The SR2N04020NAA2 includes four 30A PDUs — one per rack — distributed via a 20kW PMC (Power Management and Control) architecture. Each PDU circuit is rack-dedicated, which isolates power faults and simplifies load monitoring per enclosure.

Q: What is the total row footprint of the SR2N04020NAA2?

A: The row measures 3,900 mm end-to-end (approximately 12.8 feet). This is 600mm longer than the equivalent non-fire-suppression NAA1 configuration. Verify your aisle bay can accommodate this length before specifying, particularly in retrofit installations where existing floor layouts are fixed.

Q: What rack form factor does the SR2N04020NAA2 use?

A: Each of the four enclosures is a 42U rack, 600mm wide and 1400mm deep. This depth accommodates most standard and deep-profile servers, storage arrays, and networking equipment without requiring extended rail kits.

Marty Allison

The SR2N04020NAA2 is the configuration I reach for when a customer needs a 4-rack, 20kW prefabricated row and their local AHJ or insurance carrier mandates in-row fire suppression — the suppression cabinet is already factory-integrated, so you are not retrofitting a third-party system into a row that was never designed to accept one. The 3,900 mm footprint is the number to nail down first: that is 600mm longer than the non-suppression NAA1 at 3,300 mm, and I have seen that difference cause real headaches in constrained colocation pods where the original floor plan was drawn against the base SKU dimensions.

Technical Highlights:

• 5kW Per-Rack Allocation: With 20kW split equally across 4 racks, each enclosure gets exactly 5kW — sufficient for a 2U blade chassis or a 4-node hyperconverged cluster, but you need to audit your peak draw carefully. One rack running a dense GPU node at 6kW will exceed its allocation even if the other three are light.
• 4 × 30A PDUs via 20kW PMC: One dedicated 30A PDU per rack through the Power Management and Control distribution architecture means each rack's power is independently monitored and faulted. That is operationally cleaner than a shared PDU run — if a circuit trips, it is contained to one enclosure, not the entire row.
• Single Cooling Unit (Non-Redundant): One cooling unit handles the full 20kW load. This is the right call for deployments where the total row represents a manageable risk tier — but if any individual system in this row is tier-3 critical, re-evaluate. The FAA2 variant doubles the cooling units at the cost of an additional 300mm of row length.

Deployment Considerations:

• The 3,900 mm row length accounts for the fire suppression cabinet — do not use the NAA1's 3,300 mm dimension in your floor plan. Measure the actual bay before the configuration is locked.
• Per-rack capacity is fixed at 5kW. If your load design leaves any rack at 4.8kW average with expected peak spikes, you are running at the edge of the thermal envelope on a non-redundant cooling system — model worst-case before commissioning.

The SR2N04020NAA2 is the right spec for an edge data center in a manufacturing facility, distribution warehouse, or enterprise branch where the row is the entire compute footprint, local code requires suppression, and the IT load per rack is predictably at or below 5kW. It is not the row for high-density GPU or AI inference workloads — those need a fundamentally different power density tier.