# PC Case Cooler Master MasterBox MB400L Tower Black

**URL:** https://aio.lv/en/product--cooler-master-mcb-b400l-kn5n-s00--3491871
**Data updated:** 2025-12-29 10:57 (EET)
**Category:** Computer Cases
**Manufacturer:** Cooler Master
**Manufacturer code:** MCB-B400L-KN5N-S00
**EAN:** 4719512097670
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 40.99 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 33.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--cooler-master-mcb-b400l-kn5n-s00--3491871

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 5.54 EUR |

## Summary description

The Cooler Master MasterBox MB400L is a sleek black tower PC case designed for optimal airflow and cooling. It supports ATX power supplies and accommodates front fans of 120mm and 140mm. The case comes with a pre-installed 120mm rear fan and supports HDD sizes of 2.5" and 3.5". With dimensions of 210mm width, 411mm depth, and 410mm height, it offers a compact yet spacious design for your components.

## Long description

The Cooler Master MasterBox MB400L Tower Black is a Micro-ATX tower PC case with a brushed front panel and a subtle Cooler Master hexagon motif. Designed for effective airflow, the case includes a pre-installed 120mm rear fan, mesh intakes on the front panel, and support for multiple fan and radiator configurations while accommodating Mini-ITX and Micro-ATX motherboards, 2.5" and 3.5" drives, and ATX power supplies.
Advantages
The brushed front panel provides a minimalistic, durable finish while the hexagon emblem can illuminate when an optional RGB/ARGB fan is mounted behind the front panel. Mesh side intakes across the front increase airflow. The chassis supports up to six fans simultaneously, multiple radiator placement options (front, top, rear), and a removable/adaptable drive cage for flexible storage and PSU configurations. Two 3.5" and two 2.5" drive bays plus a 5.25" bay offer storage versatility.
Suitable for
Compact gaming builds using Micro-ATX or Mini-ITX motherboards
Systems requiring enhanced airflow and multiple fan/radiator configurations
Users who want a clean, minimal exterior with optional front-panel lighting
Key specifications
Form factor: Micro-ATX tower (supports Mini-ITX, Micro-ATX)
Front panel finish: Brushed
Pre-installed fans: 1 × 120mm rear fan
Maximum fan support: Up to 6 fans
Drive bays: 2 × 3.5", 2 × 2.5", 1 × 5.25"
Maximum GPU length: up to 344 mm
Maximum CPU cooler height: up to 166 mm
Maximum PSU length: up to 325 mm
Front/top/rear radiator support
Front I/O: 1 × USB 3.2 Gen 1 Type-A, 1 × USB 2.0
Material: Steel, Plastic
Colour: Black
Weight: 5.2 kg
How to use
Install a Mini-ITX or Micro-ATX motherboard on the included standoffs, mount storage drives in the removable drive cage or dedicated trays, and position the power supply at the rear. Use the available fan mounts to add up to six fans and place radiators in the front, top, or rear positions as needed for your cooling setup. If preferred, remove the drive cage to free space for larger radiators or longer PSUs. Connect front I/O cables to the motherboard headers for USB and power/reset functions.
Usage recommendations
For balanced airflow, use a combination of intake fans at the front and an exhaust fan at the rear; if installing an illuminated front fan, ensure correct ARGB/RGB header compatibility with your motherboard to enable the hexagon glow.

## Specifications

### Design

| Feature | Value |
|---|---|
| Type | PC |
| Form factor | Tower |
| Supported motherboard form factors | Mini-ITX, Micro ATX |
| Number of 3.5" bays | 2 |
| Number of 2.5" bays | 2 |
| Number of 5.25" bays | 1 |
| Side window | No |
| Material | Steel, Plastic |
| Product colour | Black |
| Anti-dust filter | Yes |
| Maximum CPU cooler height | 167 mm |
| Maximum graphics card length | 344 mm |
| Number of expansion slots | 4 |
| Maximum PSU length | 325 mm |

### Power supply

| Feature | Value |
|---|---|
| Power supply included | No |
| Power supply location | Bottom |
| Supported power supply form factors | ATX |

### Ports & interfaces

| Feature | Value |
|---|---|
| USB 2.0 ports quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 1 |
| Audio input | Yes |
| Audio output | Yes |

### Cooling

| Feature | Value |
|---|---|
| Number of front fans supported (max) | 2 |
| Front fans diameters supported | 140, 120 |
| Rear fans diameters supported | 120 |
| Top fans diameters supported | 140, 120 |
| Number of rear fans supported (max) | 1 |
| Number of top fans supported (max) | 1 |
| Rear fans installed | 1x 120 mm |
| Rear radiator sizes supported | 120 |
| Front radiator sizes supported | 280, 240, 140, 120 |
| Top radiator sizes supported | 120 |

### Storage

| Feature | Value |
|---|---|
| Supported HDD sizes | 2.5, 3.5 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 5.2 kg |
| Height | 410 mm |
| Width | 210 mm |
| Depth | 411 mm |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 6200 g |
| Package depth | 480 mm |
| Package height | 480 mm |
| Package width | 278 mm |

### Other features

| Feature | Value |
|---|---|
| Volume | 33.26 L |

### Logistics data

| Feature | Value |
|---|---|
| Harmonized System (HS) code | 84733080 |

## FAQ

### How much does the PC Case Cooler Master MasterBox MB400L cost, and is it available for purchase?

The price is 40.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 199 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Cooler Master products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Cooler Master service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: type, form factor, number of 3.5" bays, number of 2.5" bays, number of 5.25" bays, side window, power supply included, usb 2.0 ports quantity, usb 3.2 gen 1 (3.1 gen 1) type-a ports quantity, weight, supported motherboard form factors, material, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for PC Case Cooler Master MasterBox MB400L?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/3491871/64929473_large.webp