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Cooler Master MasterBox MB320L Mid Tower Case

CCL Code: CAS3948
Manufacturer Code: MCB-B320L-KGNN-S00
Manufacturer: Cooler Master
Cooler Master MasterBox MB320L Mid Tower Case

Key Features:

  • PSU not included
  • 2 x 2.5", 2 x 3.5" HDD Bay(s)
  • Max MB Size: Micro-ATX
  • Tempered Glass

Delivery Options (from £3.95)

Tuesday 8th December via Priority DPD

Thursday 10th December via Standard Delivery

Collection Options

Tuesday 8th December from CCL (BD11 2PS)

Tuesday 8th December from Local Collection Point


inc VAT

Buying in bulk or need help? Email our Business Team.

CoolerMaster MasterBox MB320L PC Case | MCB-B320L-KGNN-S00

The MasterBox MB320L is a Micro-ATX PC case with honeycomb mesh ventilation on either side of the DarkMirror front panel. The DarkMirror front panel is smoked a shade darker to sharpen the contrast of optional fans mounted behind it, highlighting its best features.

A high potential for both air-cooled and liquid-cooled builds comprise of front, top, and rear ventilation with the possibility to mount additional fans and radiators. Upholding the award-winning principles of the MB Series, versatility is paired with presentation to ensure that any gaming system built inside the MasterBox MB320L looks as good as it performs.

Main Features

  • DarkMirror Front Panel - The DarkMirror front panel shades light to add contrast to illuminated components.
  • Mesh Intakes - Large, mesh intakes span each side of the front panel to provide additional airflow to system.
  • Tempered Glass Side Panel - Hardware, custom-loop cooling, and the pure pride of the builder is shown in panoramic view through an edge-to-edge tempered glass side panel.
  • Adaptable Drive Cage - The drive cage is (re)movable, able to shift toward the front to accommodate for PSU space, backwards to provide additional radiator space, or even completely removed.
  • Versatile Cooling Options - Support for up to six fans and front, top, and rear radiator support ensure that performance is not compromised.
  • Room For Upgrades - Support for up to a 344mm graphics card, a 166mm CPU cooler, and up to a 325mm PSU in length provides room for upgrades to stay ahead of the game.


Internal Expansion Bays 2 x 2.5"
2 x 2.5"/3.5"


Expansion Slots 4 x Full Height


USB Ports 2 x USB 3.0
Headphone Ports 1 x 3.5mm Jack
Microphone In Port 1 x 3.5mm Jack


Cooling System Front: Supports 3 x 120mm or 2 x 140mm fans
Top: Supports 2 x 120mm or 140mm fans
Rear: Supports 1 x 120mm fan (included)
Power Supply ATX Power Supply supported


Form Factor Mid Tower Case
Case Colour Black
Material Mesh, Plastic, Tempered Glass
Motherboard Compatibility MicroATX
In The Box Case
Accessory Pack
Width 217.5 mm
Depth 435.5 mm
Height 410 mm
Weight 5.28 kg


Warranty 2 Years

Key Features

Firewire No
Main Colour Black
Case Type Tower
USB 3.0 Support Yes
Case Form Factor Mid Tower
Power Supply Included No
Optimised for Gaming
80Plus Rated No
PSU Form Factor ATX
Display Model in Showroom No
Illuminated No
L.E.D Fan No LED
Internal 3.5" Bay 2
Internal 2.5" Bay 2
Micro-ATX Yes
Cooler Height 166 mm
Built-in Card Reader No
USB Type-C Support No
Front HDMI No
Side Panel Type Tempered Glass
GPU Length 344 mm
PSU Depth 140 mm
Front Audio Type Separate
Number of Fans 1 fan(s)
LED Controller Included No
LED Strip(s) Included No
Maximum Motherboard Size Supported Micro-ATX

Item Details

Manufacturer Cooler Master
Manufacturer Code MCB-B320L-KGNN-S00
EAN 4719512097281
Condition New

Warranty Information

Warranty 2 Years

Manufacturer Information

Manufacturer Cooler Master
Manufacturer Code MCB-B320L-KGNN-S00

Do you have you a question about the Cooler Master MasterBox MB320L Mid Tower microATX Case in Black with Tempered Glass?

Q: is the front panel see through like the rgb version of the case
Answer by Website User on 1st October 2020
It is darkened acrylic but you can see through it. -MR
1 customer found this answer helpful.
Post Answer
5 / 5 1 review


last week

Perfect size, super easy to build with, decent airflow.

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