Cooler Master MasterBox Q300L Mini Case fits mATX (MCB-Q300L-KANN-S00)

1,290.- 1,590.-
Temporarily Unavailable
Key Specifications
  • fits up to mATX motherboards

  • Max CPU cooler height: 159mm

  • 1 x 3.5" + 2 x 2.5"

  • up to 240mm radiator

Color: Black

SKU:#034413 Product No.:MCB-Q300L-KANN-S00 Short link: See specifications from the manufacturer

The MasterBox Q300L is your straightforward option in the lineup of the brand new MasterBox Q-series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance.

Although the size wouldn’t tell, the MasterBox Q300L supports a standard ATX PSU which we don’t see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best.

Due to the cube design of the frame and special pattern design on the dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the MasterBox Q300L the perfect choice for office and home usage.


Form factorMidi Tower
Product colourBlack
Supported motherboard form factorsMicro ATX,Mini-ITX
Number of 3.5" bays1
Side windowY
Number of 2.5" bays2
Number of expansion slots4
Anti-dust filterY
Cable managementY
LED indicatorsY
Maximum CPU cooler height15.7 cm
Maximum graphics card length36 cm
Maximum PSU length16 cm

Power supply

Power supply includedN
Power supply locationBottom
Supported power supply form factorsATX,PS2

Ports & interfaces

USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity2
Audio inputY
Audio outputY


Number of front fans supported (max)2
Front fans diameters supported120,140 mm
Rear fans installed1x 120 mm
Number of rear fans supported (max)1
Rear fans diameters supported120 mm
Number of top fans supported (max)2
Top fans diameters supported120 mm
Number of bottom fans supported (max)1
Bottom fans diameters supported120 mm
Liquid cooling capabilityY
Front radiator fan sizes supported120,240 mm
Rear radiator fan sizes supported120 mm


Supported HDD sizes2.5,3.5"

Weight & dimensions

Width230 mm
Depth387 mm
Height378 mm
Weight3.7 kg

Packaging data

Package width276 mm
Package depth435 mm
Package height461 mm
Package weight4.7 kg