APC by Schneider Electric AR3300 NetShelter SX 42U Server Rack Enclosure
Overview
The APC by Schneider Electric AR3300 is a 42U free-standing rack enclosure built for data center and server room deployments where structured airflow, solid cable management, and long-term serviceability matter. At 600mm wide and 1200mm deep, it comfortably accommodates deep server hardware, high-density patch panels, and the cable plant that goes with them — without forcing tradeoffs between equipment fit and airflow clearance.
The NetShelter SX line has been the workhorse of structured IT deployments for over two decades, and the AR3300 represents the standard 42U configuration in that family. If you're building out a rack row in a purpose-built data center or provisioning a dedicated server room for an enterprise branch, this is the model that fits the standard use case without upsells or compromises.
Key Features
- 42U Rack Capacity: Forty-two rack units of usable space gives you enough room to mix high-density compute, storage, and networking in a single enclosure without stacking enclosures or splitting infrastructure across two racks. That matters for cable run length and management complexity in single-row deployments.
- 600mm Wide x 1200mm Deep Footprint: The 600mm width is the narrower of the two standard rack widths, making this a practical choice when floor space is constrained. The 1200mm depth handles today's deep 1U and 2U servers — including configurations with rear-facing power supplies and dense cabling — without the equipment protruding past the rear door.
- Front-to-Rear Airflow Design: The perforated front and rear doors are engineered to support the front-to-rear (cold aisle / hot aisle) airflow model used in virtually every modern data center cooling architecture. Equipment intake draws cool air from the front; exhaust exits the rear. This keeps your rack aligned with in-row cooling, containment systems, and CRAC unit placement — no workarounds needed.
- Perforated Door Construction: Perforated doors deliver unrestricted airflow to equipment while keeping the enclosure closed for security and dust management. This is the correct choice for active compute and networking gear; solid doors restrict airflow and should be reserved for passive or low-density content.
- Lever Handle Lock: The lever handle locking mechanism provides quick, single-hand access for authorized personnel while maintaining physical security of rack contents. Relevant in shared data center environments or co-location facilities where aisle access is not restricted by default.
- 19-Inch Square-Punched Rail System: The 19-inch square-punched mounting rails follow the EIA-310 standard — the universal mounting standard for server, networking, and storage hardware. Square-punched accepts both cage nuts and clip-nuts, giving you flexibility for equipment from any vendor without adapter rails or custom hardware.
- Steel Construction in Black Finish: The steel frame and panels provide the structural rigidity needed to support fully populated rack loads. Black finish is standard for data center environments and matches the aesthetic of adjacent enclosures in mixed-vendor deployments.
- Free-Standing Configuration: The AR3300 ships as a self-supporting free-standing enclosure — no wall anchoring required. This makes it deployable in raised-floor data centers, concrete slab machine rooms, and anywhere overhead or wall attachment isn't practical. Floor leveling feet accommodate minor floor irregularities.
Integration and Compatibility
The AR3300 integrates directly with APC's NetShelter SX accessory ecosystem — side panels, roof panels, blanking panels, cable management arms, and power distribution units (PDUs) are available as add-ons and designed to fit this enclosure without modification. The 19-inch square-punched rail system accepts standard rack hardware from all major server, networking, and storage vendors, so there are no compatibility concerns for mixed-vendor deployments.
For power distribution inside the enclosure, APC's rack-mount PDU lineup mounts directly to the vertical rails or toollessly to the rear of the enclosure. If you're building out network rack enclosures for structured cabling or IDF/MDF applications, the AR3300's depth accommodates patch panel arrays alongside active networking gear without crowding.
Physical security integrators deploying server infrastructure for NVR systems, access control head-end servers, or VMS appliances will find the AR3300's front-to-rear airflow particularly relevant — compute-heavy video analytics servers generate significant heat, and proper enclosure airflow keeps hardware within operating thermal limits. Browse the full APC by Schneider Electric catalog for compatible PDUs, KVM switches, and UPS systems that pair with this enclosure.
For organizations building out power-protected rack infrastructure, pairing the AR3300 with a compatible UPS system and rack-mount PDU is standard practice for any uptime-critical deployment. See our data center planning guide for rack density, power budgeting, and cooling architecture considerations that affect enclosure selection.
Frequently Asked Questions
Q: What is the usable rack unit capacity of the AR3300?
A: The AR3300 provides 42U of usable rack space on 19-inch square-punched mounting rails, following the EIA-310 standard.
Q: Does the AR3300 support front-to-rear airflow for hot aisle/cold aisle data center configurations?
A: Yes. The AR3300 features perforated front and rear doors specifically designed for front-to-rear airflow, making it compatible with hot aisle/cold aisle cooling architectures and in-row cooling systems.
Q: What type of mounting rails does the AR3300 use?
A: The AR3300 uses 19-inch square-punched rails, which accept standard cage nuts and clip-nuts and are compatible with server, networking, and storage hardware from all major vendors.
Q: Can the AR3300 accommodate deep 1U and 2U servers?
A: The 1200mm internal depth is designed to accommodate deep rack-mount equipment, including servers with rear-facing power supplies and dense rear cabling, without requiring the doors to be left open.
Q: Is the AR3300 compatible with APC NetShelter SX accessories?
A: Yes. The AR3300 is part of the NetShelter SX family and is designed to accept APC's ecosystem of side panels, blanking panels, cable management accessories, and rack PDUs built for this enclosure series.
Q: What type of lock does the AR3300 use?
A: The AR3300 uses a lever handle lock on its perforated doors, providing single-hand access for authorized personnel while maintaining physical security of rack contents.
The AR3300 is the configuration I recommend most often when a team is building out their first dedicated server room or expanding an existing rack row: 42U at 600mm wide gives you a full rack's worth of space without the 750mm footprint that eats into already-tight aisles. The 1200mm depth is the spec that actually matters for modern hardware — I've seen too many installs where a 900mm or 1000mm-deep enclosure forced a choice between closing the rear door and properly seating the server.
Technical Highlights:
- 1200mm Internal Depth: Accommodates current-generation 2U and 4U servers with rear power supplies, thick cable bundles, and PDU arms without compromising door closure — critical for maintaining hot-aisle/cold-aisle containment integrity.
- Square-Punched 19-Inch Rails: EIA-310 compliant square-punch accepts cage nuts and clip-nuts from any vendor, so you're never hunting for proprietary hardware when racking mixed-vendor equipment — a real time-saver during fast-paced rollouts.
- Perforated Front-to-Rear Doors: Purpose-built for active compute; the perforation pattern is matched to the airflow requirements of the NetShelter SX series, keeping rack inlet temperatures within spec when combined with proper cold aisle discipline.
Deployment Considerations:
- The 600mm width is narrower than the 750mm variant — confirm your PDU, cable management arms, and side-by-side mounting brackets are specified for 600mm before ordering accessories; mixing widths in a row creates containment gaps.
- The AR3300 is a free-standing enclosure; seismic bracing kits or floor-anchoring hardware are sold separately and should be evaluated for any deployment in earthquake zones or raised-floor environments with significant underfloor plenum pressure.
For a physical security operations center or enterprise branch server room running NVR appliances, access control servers, and network infrastructure in a single enclosure, the AR3300 hits the right balance of depth, density, and airflow management without requiring a full data center buildout to support it.
