19-inch wall-mounted data cabinets
300mm Deep Data Cabinets
Shop 300mm deep 19-inch data cabinets for shallow wall-mounted network installations. A 300mm nominal cabinet depth does not mean 300mm of equipment space; compare heights and check the usable depth, rack position and rear cable clearance before choosing a cabinet.
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Compare 300mm data cabinets
Compare rack heights and real prices side by side. Open a cabinet for full dimensions, compatible accessories and expert answers.
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12U 300mm Deep 19"
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9U 300mm Deep 19"
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6U 300mm Deep 19"
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4U 300mm Deep 19"
Choosing a shallow 300mm data cabinet
A 300mm cabinet is useful where space is tight, but 300mm is the outside depth—not the room available for your equipment. Check the actual device depth and allow space for plugs and cables before ordering.
How much equipment depth do you actually have?
A 300mm P Series cabinet has approximately 250mm of usable internal depth, but we recommend keeping equipment to around 200mm deep where possible. This leaves room for power plugs, network connectors and cable bends. Check the dimensions and mounting position of your actual equipment before ordering.
Allow room for cables and the front door
Measure from the front mounting ears to the back of the device, then include anything that projects beyond it. Power connectors, fibre leads and cable bends all need space. Moving the mounting profiles changes where the equipment sits; it does not make the cabinet deeper.
Choose rack height separately
A 300mm-deep cabinet can still be available in several rack heights. Count the rack units you need, including shelves and accessories. If the equipment is too deep for a shallow enclosure, compare a 450mm cabinet instead of squeezing the cables against the rear panel.
Need help planning your installation? Try the Cabinet Finder or use the Cabinet Builder to select compatible accessories.
300mm Data Cabinets: Your Questions Answered
Practical advice from our technical team on usable depth, cable clearance, mounting profiles and equipment fit.
How deep should equipment normally be in a 300mm cabinet?
For a 300mm cabinet, we recommend equipment approximately 200mm deep or less where practical.
Usable internal depth is approximately 250mm. Additional space must still be allowed for connectors, cable bends and front clearance.
The Miniline 300mm cabinets should be treated conservatively near their physical limit because front-profile position can affect door-lock clearance.
What is the difference between nominal cabinet depth and usable internal depth?
The nominal cabinet depth describes the overall depth class of the enclosure — for example 300mm, 450mm, 550mm or 600mm.
The usable internal depth is the space available inside the cabinet after allowing for the front door, rear structure and other parts of the enclosure. It is therefore smaller than the nominal depth.
Approximate usable internal depths are 250mm for a 300mm cabinet, 400mm for a 450mm cabinet, 500mm for a 550mm cabinet and 550mm for a 600mm cabinet.
Usable internal depth should not automatically be treated as suitable equipment depth because connectors, cable bends, rail position and front-door clearance also require space.
Do rear plugs, connectors and cable bends need to be included when checking equipment depth?
Very much so.
The chassis depth tells you where the equipment finishes. It doesn’t tell you where the installation finishes.
An IEC plug, RJ45 connector, fibre lead or other rear connection can require significant additional space, and cables need a sensible bend rather than being folded immediately against the rear panel.
This is one reason the recommended equipment depth is deliberately smaller than the available internal depth. A switch that fits perfectly until somebody attempts to connect electricity to it has only passed the first half of the examination.
How should I measure the depth of rack-mounted equipment?
Measure from the front mounting face, where the rack ears sit against the cabinet profiles, to the rearmost part of the chassis.
Then look at what sticks out beyond it.
Power plugs, network connectors, fibre connectors and cable bends all need space too.
Can the mounting profiles be adjusted forwards and backwards?
Yes. The mounting profiles can be repositioned front-to-back within the cabinet.
This allows the rack position to be adjusted for different equipment depths, front-door clearance and rear cable space.
Moving a profile changes where the equipment sits inside the cabinet; it does not increase the cabinet's total internal depth.
Will front-facing plugs and patch leads clear the closed glass door?
Usually, provided sufficient front clearance has been allowed.
Front-mounted RJ45 plugs, patch leads, fibre connectors, handles and controls can project beyond the equipment mounting face. The front mounting profiles can be moved rearwards where necessary to create additional space between the equipment and the glass door.
The actual projection should be checked before installation.