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Cooler Master MasterBox MB400L mATX Case + 500W PSU

MCB-B400L-KNNB50-S00 | Cooler Master
In stock
Buy now, pay later!
The Cooler Master MasterBox MB400L mATX case features a brushed front panel with mesh intakes for additional airflow, steel side panels, supports mini ITX and micro ATX motherboards, 1 x pre-installed 120mm fan, radiator support at the top (up to 120mm), front (up to 280mm) and rear (up to 120mm) and supports a graphics card of up to 344mm in length, additional 500W "ELITE NEX 230V PEAK POWER 500" PSU included with case (not pictured).


Cooler Master MasterBox MB400L mATX Case Feature 1

Brushed Front Panel

A brushed finish spans the entire front panel for an elegant and minimalistic design.

Cooler Master MasterBox MB400L mATX Case Feature 2

Hexagon Gleam

If an optional, illuminated fan is installed, the Cooler Master hexagon logo will capture light from the fan and emit a glow on the front panel.

Mesh Intakes

Large, mesh intakes span each side of the front panel to provide additional airflow to system.

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.


Model Number MCB-B400L-KGNN-S00
Series MasterBox Series
Size Mini Tower
Available Colour(s) Black
Materials Steel, Plastic
Dimensions (L X W X H) 411 x 210 x 410mm (Incl. Protrusions), 396 x 210 x 400mm (Excl. Protrusions)
Weight 5.47kg
Motherboard Support Micro ATX, Mini ITX
Expansion Slots 4
5.25" Drive Bays 0
3.5" Drive Bays 2
2.5" Drive Bays 2
I/O Panel 2x USB 3.2 Gen 1 (formerly USB 3.0), 1x 3.5mm Headset Jack (Audio+Mic)
Pre-Installed Fans - Rear 1 x 120mm (Black)
Fans Support - Top 2 x 120 / 140mm
Fans Support - Front 3 x 120mm, 2 x 140mm
Fans Support - Rear 1 x 120mm
Radiator Support - Top 120mm, 240mm
Radiator Support - Front 120mm, 140mm, 240mm, 280mm
Radiator Support - Rear 120mm
Clearance - CPU Cooler 166mm
Clearance - PSU 140mm (HDD cage in backmost position), 325mm (w/o front radiator & HDD Cage)
Clearance - GFX 344mm
Cable Routing 18-22mm
Dust Filters Top, Front, Bottom
Power Supply Included Elite NEX Peak Power PSU 500W
Warranty 2 Years
Backed by a 2 year Cooler Master warranty.

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