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Cooler Master MasterBox MB400L black (MCB-B400L-KNNN-S00)

Photos - Computer Case Cooler Master MasterBox MB400L black
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£121.28 
Features: gaming; Form factor: Mini Tower; Mount: vertical; Motherboard support: micro-ATX; PSU form factor: ATX (regular); Dimensions (mm): 410x218x411; Weight (kg): 5.47; Material: steel; 3.5" bays: 2; internal 2.5" compartments: 2; Expansion slots: 4; Installed fans: Fans total: 1; Characteristics of installed fans: 1x120mm
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Cooler Master MasterBox MB400L black
Mastergaming
Chassis Form Factor:Mini Tower
Motherboard size:micro-ATX
PSU power:no PSU
Internal bays 3.5":2
Internal bays 2.5":2
Front panel:USB-A 2 pcs
Model with tempered glass side viewing window MasterBox MB400L TG.
All specifications
Specifications MasterBox MB400L
Colour
Featuresgaming
Form factorMini Tower
Mountvertical
Motherboard supportmicro-ATX
PSU form factorATX (regular)
Computer case
Dimensions (HxWxD)410x218x411 mm
Graphics card max lenght344 mm
Fan max height166 mm
Weight5.47 kg
Materialsteel
Rubber feet
Side panelremovable
Storage
PSU
PSU mountbottom
3.5" bays2
internal 2.5" compartments2
Expansion slots4
Cooling
Installed fans1 шт
1x120mm
Fans (back)1x120mm
Fans (front)2x140mm / 3x120mm /
Fans (top)2x140mm / 2x120mm /
Dust filter+
Liquid cooling system support
Liquid cooling system
Liquid cooling (rear)120 mm
Liquid cooling (front)280 mm
Liquid cooling (top)240mm
Liquid cooling mounts3
Connectors and functions
Placementon top of the case
USB-A 5Gbps2 pcs
Audio (microphone/headphones)
More features
More featureshidden wiring
CPU cooling mount window
Added to E-CatalogJuly 2020
P/N
MCB-B400L-KNNN-S00

E-Catalog UK editor, Computer Cases
Valerii Lenko, edited 06.04.2026
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
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User reviews 1
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I definitely recommend you take it if what I have listed is right for you.
13 September 2021 
Excellent model for your money. As for me, even more top-end cases are sometimes done worse
Price, I bought it for 3800 RUB.
Hidden cable routing, plenty of space, more than enough.
PSU shroud covering both the power supply unit and the drives.
Package contents included cable ties, anti-vibration mounts for the hard drive, SSD mount.
Fairly sturdy metal.
Minimalistic, monotone, angular design, yes, quite specific. But I really liked it.
Good thick tempered glass.
Decent dust filters.
One cooler is included, and it's without RGB and, even more so, without an addressable strip. There is no manufacturer sticker to place on the front cover, although a spot for it is specifically marked. The front cover is made of plastic. Few ports on the cover, especially for audio.
use Cooler Master MasterBox MB400L few months
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