Middle Atlantic RSH4A3M 3U Custom Rackshelf 14-Inch Deep Anodized Black
Overview
The Middle Atlantic RSH4A3M is a 3U steel rackshelf designed to mount non-rack-ear equipment inside standard 19-inch equipment racks. At 14 inches (356 mm) deep, it accommodates mid-depth devices — think small NVRs, PoE injectors, media converters, unmanaged switches, or UPS units that ship without rack ears — without protruding past the rear rail or consuming more vertical space than the job requires. The anodized black finish integrates cleanly into the Middle Atlantic rack ecosystem and matches the interior of most commercial enclosures.
Three rack units of height (133 mm) gives you enough clearance for equipment that stacks awkwardly in a single 1U slot, and enough presence to organize cabling without cramping adjacent gear. If you're building out a network video recorder rack or a surveillance head-end cabinet, the RSH4A3M handles the components that don't come with their own mounting solution.
Key Features
- 3U Rack Height (133 mm): Three rack units means you're not forcing a 2U-footprint device into a 1U gap. That extra clearance also leaves room for airflow between the shelf surface and the gear above it — relevant when you're stacking power supplies or NVRs that run warm.
- 14-Inch Depth (356 mm): Sized for mid-depth equipment. Shallow enough that it won't conflict with rear-mounted cable managers in a standard 24-inch-deep rack, deep enough to support most small appliances without an additional support arm. If your rack is shallower than 18 inches, measure rear-rail clearance before ordering.
- Steel Construction: The steel deck handles static loads without flexing under the weight of typical security appliances — encoders, managed switches, small UPS modules. No flex means no contact stress on the chassis of whatever sits on it.
- Anodized Black Finish: Anodizing is a surface treatment, not paint — it won't chip or flake into equipment ventilation slots over years of use. Matches standard rack interior finishes and Middle Atlantic enclosure interiors without color drift.
- Standard 19-Inch Rack Width (482.6 mm): Mounts in any EIA-standard 19-inch rack — Middle Atlantic, Tripp Lite, Eaton, open-frame, wall-mount, or floor-standing. No adapter rails needed.
- Single-Unit Pack Quantity: Sold individually, so you can spec exactly the number of shelves you need per cabinet without overage. Useful when deploying a mix of shelf sizes across multiple racks in a rack accessories build-out.
Integration and Compatibility
The RSH4A3M fits any rack that follows EIA-310 19-inch mounting standards, which covers the overwhelming majority of commercial and enterprise enclosures. It is part of the broader Middle Atlantic product line, so it pairs directly with Middle Atlantic racks, enclosures, and cable management systems without fitment guesswork.
Common deployment pairings for rack shelf solutions in surveillance head-end rooms include: unmanaged PoE switches that lack rack ears, small form-factor NVRs, IP-to-analog encoders, fiber media converters, and compact UPS units. The 14-inch depth accommodates the majority of these appliance categories without modification.
Verify your rack's available U-space before ordering — 3U is a meaningful commitment in a loaded cabinet. Also confirm your rack depth: rear equipment panels and cable troughs in shallow wall-mount enclosures can reduce available shelf depth below the 14-inch nominal.
Frequently Asked Questions
Q: What rack standard does the RSH4A3M fit?
A: The RSH4A3M is designed for standard EIA-310 19-inch equipment racks, with a mounting width of 482.6 mm. It is compatible with any compliant 19-inch rack from any manufacturer.
Q: How much vertical space does the RSH4A3M occupy in a rack?
A: It occupies 3U (rack units), which equals 133 mm of vertical height. Plan accordingly when calculating remaining U-space in a populated cabinet.
Q: What is the shelf depth on the RSH4A3M?
A: The RSH4A3M is 14 inches (356 mm) deep. This accommodates most mid-depth appliances. Verify rear-rail clearance in your specific enclosure, especially in shallow wall-mount racks.
Q: What material is the RSH4A3M shelf made from?
A: The shelf deck is steel with an anodized black finish. Anodizing provides a durable, chip-resistant surface that will not flake into equipment ventilation over time.
Q: Is the RSH4A3M sold as a single unit or in a multi-pack?
A: The RSH4A3M is sold individually — one shelf per order. This lets you specify exactly the quantity needed without surplus.
Q: Can the RSH4A3M be used in non-Middle Atlantic racks?
A: Yes. The 482.6 mm mounting width conforms to the EIA-310 19-inch standard, so it installs in any compliant rack enclosure regardless of manufacturer.
The RSH4A3M comes up regularly in surveillance head-end builds where you have a handful of components — fiber converters, small managed switches, an extra NVR — that just don't have rack ears. The 14-inch depth is the spec that actually matters here: at 356 mm, it clears the rear cable trough in a typical 24-inch-deep floor cabinet without any modification, and the 3U height gives you real working clearance rather than trying to jam gear into a 1U slot.
Technical Highlights:
- 3U Height (133 mm): Enough vertical clearance for appliances that stack over 1U, and leaves an air gap above the shelf surface when the next device is mounted above it — better than running gear flush against a 1U shelf lid.
- Steel Deck with Anodized Finish: Anodizing is a hardened oxide layer, not a paint coat — it won't chip under load cycles or shed debris into equipment vents. Relevant for any installation expected to run for years without scheduled maintenance.
- 482.6 mm Mounting Width: Dead-standard EIA-310, so you're not locked into Middle Atlantic enclosures. It drops into any 19-inch rack you already have on-site, which matters when you're standardizing a mixed-vendor infrastructure.
Deployment Considerations:
- Measure your available rear-rail clearance before specifying the 14-inch depth in shallow wall-mount enclosures — some 15-inch-deep wall racks leave less than 14 inches of usable shelf depth once the vertical cable manager is in place.
- The RSH4A3M does not include a weight-rated load spec in the available evidence — for heavy UPS modules or multi-drive NVRs, confirm the static load rating with Middle Atlantic before committing to this shelf for that application.
Best fit for surveillance head-end rooms and security operations closets where you're consolidating mixed gear — encoders, media converters, small switches — into a clean rack build without ordering custom mounting hardware for every component.
