Cooler Master MasterBox MB400L

mATX, Mini-ITX
Ratings
Currently out of stock
Free shipping starting at 50.–

Product details

Every element of the MasterBox MB400L has been crafted from an elegant palette. With a brushed surface, a subtle hue, and the minimalist hexagon from Cooler Master, this Micro-ATX PC case enhances both gaming setups and workspaces while providing space for modern hardware. The high style complements the high upgradability with front, top, and rear ventilation, offering additional mounting options for future cooling component upgrades. If an optional RGB or ARGB fan is installed behind the front panel, the Cooler Master Hexagon will also be illuminated on the front panel. In total, up to 6 fans can be mounted simultaneously to ensure that even the most demanding builds stay cool under heavy load.

Key specifications

PC case design
Mini Tower
Number of 3.5" drive slots (internal)
2 x
Max. length graphics card
344 mm
Front connectors
2x USB 3.2 Gen 1, Headphones, Microphone
Max. height CPU cooler
167 mm
Item number
15666150

General information

Manufacturer
Cooler Master
Category
PC case
Manufacturer no.
MCB-B400L-KNNN-S00
Release date
15.4.2021

Colour

Colour
Black
Exact colour description
Black

Material

Material group
Metal, Plastic
Material
brushed metal, Net, Plastic, Steel

PC case properties

PC case design
Mini Tower
Form factor
Micro ATX (mATX), Mini-ITX
Number of 3.5" drive slots (external)
2 x
Number of 3.5" drive slots (internal)
2 x
"Number of 2.5""/3.5"" combination slots"
2 x
"Number of 2.5"" drive slots"
2 x
Number of expansion card slots
4 x
Max. length graphics card
344 mm
Max. height CPU cooler
167 mm
Max length of power supply
140 mm

Connections

Front connectors
2x USB 3.2 Gen 1, Headphones, Microphone

Cooling properties

Number of fans
6 x
Number of fan slots
6 x
Number of radiator mounts
1

Front side

Fans included
1x 120mm
Fan mount locations
3x 120mm

Rear side

Fans included
1x 120mm
Fan mount locations
1x 120mm
Radiator mount locations
1x max. 120mm

Side

Fans included
1x 120mm
Fan mount locations
3x 120mm
Radiator mount locations
1x max. 120mm

Top side

Fans included
1x 120mm
Fan mount locations
3x 120mm
Radiator mount locations
1x max. 120mm

HDD Cage

Fans included
1x 120mm
Fan mount locations
1x 120mm
Radiator mount locations
1x max. 120mm

Voluntary climate contribution

CO₂-Emission
Climate contribution

Product dimensions

Height
41 cm
Length
41.10 cm
Width
21 cm
Weight
5.47 kg

Package dimensions

Length
48 cm
Width
29 cm
Height
49 cm
Weight
5.66 kg

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Reviews & Ratings

Warranty score

How often does a product of this brand in the «PC case» category have a defect within the first 24 months?

Source: Digitec Galaxus
  • 13.Montech
    0.5 %
  • 13.Phanteks
    0.5 %
  • 17.Cooler Master
    0.6 %
  • 17.Endorfy
    0.6 %
  • 17.Jonsbo
    0.6 %

Warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Digitec Galaxus
  • 8.be quiet!
    2 days
  • 8.Fractal
    2 days
  • 10.Cooler Master
    3 days
  • 10.Phanteks
    3 days
  • 12.Corsair
    6 days

Return rate

How often is a product of this brand in the «PC case» category returned?

Source: Digitec Galaxus
  • 18.ASUS
    4.4 %
  • 20.Fortron
    4.6 %
  • 21.Cooler Master
    4.7 %
  • 21.Endorfy
    4.7 %
  • 23.Darkflash Tech
    5.1 %
Source: Digitec Galaxus