# PC Case Cooler Master MasterBox NR400 Mini Tower Black

**URL:** https://aio.lv/en/product--cooler-master-mcb-nr400-kgnn-s00--1990054
**Data updated:** 2025-12-29 10:31 (EET)
**Category:** Computer Cases
**Manufacturer:** Cooler Master
**Manufacturer code:** MCB-NR400-KGNN-S00
**EAN:** 4719512080276
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 54.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 45.45 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--cooler-master-mcb-nr400-kgnn-s00--1990054

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 6.27 EUR |

## Summary description

The Cooler Master MasterBox NR400 is a Mini Tower PC case designed for optimal airflow and cooling. It features a sleek black design, bottom-mounted power supply, and supports ATX and PS2 power supply form factors. The case comes with one pre-installed 120mm front fan and supports additional 120mm or 140mm fans for enhanced cooling. It accommodates both 2.5" and 3.5" HDD sizes, making it versatile for various storage needs. Dimensions: 210mm (W) x 411mm (D) x 411mm (H).

## Long description

The Cooler Master MasterBox NR400 without ODD is a Mini Tower PC case designed for focused airflow and practical storage. Its single-layer fine mesh front panel maximizes air intake while serving as a dust filter. The tempered glass side panel sits flush with the chassis and is secured with tabs and thumbscrews. The case supports bottom-mounted power supplies, accommodates Mini-ITX and Micro ATX motherboards, and ships with one pre-installed 120 mm front fan. Dimensions: 210 mm (W) x 411 mm (D) x 411 mm (H).
Advantages
The NR400 prioritizes cooling with a full mesh front that improves airflow and reduces dust buildup. Its seamless tempered glass side panel provides a clean interior view while maintaining a secure fit. Tool-less drive mounting supports multiple 2.5" and 3.5" drives in various locations, and the single 4-pole headset jack combines audio and microphone functions for simpler connectivity. Compact Mini Tower proportions and support for common radiator sizes allow flexible cooling and component choices.
Suitable for
Compact gaming or productivity builds using Mini-ITX or Micro ATX motherboards
Systems that require strong airflow and multiple storage drives
Users who want a tempered glass side panel with a minimal exterior
Key specifications
Form factor: Mini Tower
Supported motherboard sizes: Mini-ITX, Micro ATX
Drive bays: 4 x 2.5" and 3 x 3.5" (tool-less)
Pre-installed fans: 1 x 120 mm front fan
Fan support: Front 120 mm x3 or 140 mm x2; Top 120 mm x2 or 140 mm x2; Rear 120 mm x1
Radiator support: Front 120/140/240/280 mm; Top 120/240 mm; Rear 120 mm
Front panel: single-layer fine mesh (acts as dust filter)
Side panel: tempered glass, flush-mounted
Front I/O: 1 x 4-pole headset jack, 2 x USB 3.2 Gen 1 Type-A
Power supply: bottom-mounted, not included
Material: Steel and plastic
Colour: Black
Dimensions (W x D x H): 210 x 411 x 411 mm
Weight: 5.56 kg
MPN/EAN: MCB-NR400-KGNN-S00 / 4719512080276
How to use
Install the motherboard (Mini-ITX or Micro ATX) onto the tray and mount the power supply in the bottom compartment. Fit storage drives using the tool-less trays or mounts on the PSU shroud and inside the HDD cage. Route cables behind the motherboard tray for a tidy build and secure the tempered glass side panel with the provided thumbscrews and tabs. Add optional fans or radiators to the front, top, or rear according to supported sizes to improve cooling performance.
Usage recommendations
For best airflow, populate the front with intake fans (up to three 120 mm or two 140 mm) and use the rear/top positions for exhaust. Keep the front mesh clean to maintain optimal intake efficiency, and verify radiator clearance against your chosen CPU cooler and GPU length before final assembly.

## Specifications

### Design

| Feature | Value |
|---|---|
| Type | PC |
| Form factor | Mini Tower |
| Supported motherboard form factors | Mini-ITX, Micro ATX |
| Number of 3.5" bays | 3 |
| Number of 2.5" bays | 4 |
| Side window | Yes |
| Material | Steel, Plastic |
| Product colour | Black |
| Anti-dust filter | Yes |
| Suitable for | Gaming |
| Maximum CPU cooler height | 166 mm |
| Maximum graphics card length | 346 mm |
| Number of expansion slots | 4 |
| Maximum PSU length | 325 mm |
| Cable management | Yes |
| Reset button | Yes |
| On/off button | Yes |
| Tempered glass panel(s) | Yes |

### Power supply

| Feature | Value |
|---|---|
| Power supply included | No |
| Power supply location | Bottom |
| Supported power supply form factors | ATX, PS2 |

### Ports & interfaces

| Feature | Value |
|---|---|
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| Audio input | Yes |
| Audio output | Yes |

### Cooling

| Feature | Value |
|---|---|
| Front fans installed | 1x 120 mm |
| Number of front fans supported (max) | 3 |
| 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) | 2 |
| Rear fans installed | 1x 120 mm |
| Liquid cooling capability | Yes |
| Rear radiator sizes supported | 120 |
| Front radiator sizes supported | 280, 240, 140, 120 |
| Top radiator sizes supported | 240, 120 |

### Storage

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

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 5.56 kg |
| Height | 411 mm |
| Width | 210 mm |
| Depth | 411 mm |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 6590 g |
| Package depth | 480 mm |
| Package height | 480 mm |
| Package width | 278 mm |

### Logistics data

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

## FAQ

### How much does the PC Case Cooler Master MasterBox NR400 cost, and is it available for purchase?

The price is 54.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 33 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 14.07.2026 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 NR400?

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/1990054/64914829_large.webp