---
product_id: 48747458
title: "CiT M-300U 300W Micro Atx Power Supply"
brand: "cit"
price: "R$301"
currency: BRL
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.br/products/48747458-cit-m-300u-300w-micro-atx-power-supply
store_origin: BR
region: Brazil
---

# 300W reliable power output Ultra-low noise operation Intelligent thermal fan control CiT M-300U 300W Micro Atx Power Supply

**Brand:** cit
**Price:** R$301
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up silently, perform endlessly.

## Quick Answers

- **What is this?** CiT M-300U 300W Micro Atx Power Supply by cit
- **How much does it cost?** R$301 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/48747458-cit-m-300u-300w-micro-atx-power-supply)

## Best For

- cit enthusiasts

## Why This Product

- Trusted cit brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optimized Cooling:** Dynamic fan speed control adapts to workload, balancing cooling and silence perfectly.
- • **Advanced Protection:** Built-in over-voltage and short-circuit safeguards protect your valuable components.
- • **Compact & Lightweight:** Slim 10x12.5x6 cm design at just 700g fits seamlessly into any Micro ATX chassis.
- • **Efficient Power Delivery:** 300W output with Passive PFC ensures stable, energy-saving performance for your Micro ATX build.
- • **Whisper-Quiet Performance:** Silent PSU with smart temperature-controlled fan keeps your workspace distraction-free.

## Overview

The CiT M-300U is a compact 300W Micro ATX power supply featuring intelligent thermal fan control for ultra-quiet operation, Passive PFC for efficient power delivery, and built-in protections against over-voltage and short circuits, making it an ideal choice for professional-grade, noise-sensitive PC builds.

## Description

Product Description          The CiT Super Quiet Micro ATX 300W is a high efficiency power system unit, with low ripple and noise, which assures over voltage protection and short circuit protection.             Box Contains          Power Supply

## Features

- Silent PSU with Temperature Control Fan
- Complies with Intel ATX12V 2.31VER
- Fan Speed Control Function Inside
- Passive PFC (Power Factor Correction)
- Low noise with intelligent-thermal fan control technology

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | CiT |
| Product Dimensions | 10 x 12.5 x 6 cm; 700 g |
| Item model number | M-300U |
| Manufacturer | A One Distribution (UK) Ltd |
| Series | ATX Power Supply |
| Form Factor | Micro ATX |
| Wattage | 300 watts |
| Are Batteries Included | No |
| Item Weight | 700 g |
| Guaranteed software updates until | unknown |

## Product Details

- **Model name:** ATX Power Supply
- **Brand:** CiT
- **Compatible devices:** Personal Computer
- **Connector type:** ATX
- **Output wattage:** 300 Watts
- **Form factor:** Micro ATX
- **Wattage:** 300 watts
- **Cooling method:** Air
- **Item dimensions L x W x H:** 10 x 12.5 x 6 centimetres
- **Item weight:** 0.7 Kilograms

## Images

![CiT M-300U 300W Micro Atx Power Supply - Image 1](https://m.media-amazon.com/images/I/61pnukQWKCL.jpg)
![CiT M-300U 300W Micro Atx Power Supply - Image 2](https://m.media-amazon.com/images/I/71rpKyKkSlL.jpg)
![CiT M-300U 300W Micro Atx Power Supply - Image 3](https://m.media-amazon.com/images/I/71gn+7ry8HL.jpg)
![CiT M-300U 300W Micro Atx Power Supply - Image 4](https://m.media-amazon.com/images/I/61qRMVBnRxL.jpg)
![CiT M-300U 300W Micro Atx Power Supply - Image 5](https://m.media-amazon.com/images/I/41EjMU-NboL.jpg)

## Questions & Answers

**Q: Does this fit a sfx case, keeps coming up in search for sfx psu?**
A: This PSU is a smaller form factor the the normal ATX psu. You could check the CiT website to see if they detail the units dimensions. I think i recall checking wikipedia about PSU standards, you will hopefully find CiT published data matches the wikipedia details. From the photo you can see the different case mounting screw hole positions relative tp a normal ATX psu and the size of the euro mains socket is proportionally larger than it would appear on a normal ATX psu. Hpoe this is helpful.

**Q: Does this psu have 6 pin and 8 pin connectors for graphics cards?**
A: no

**Q: Why doesn't it fit in my micro ATX case?**
A: hi it wont fit as the format on the 300w micro is smaller form factor

**Q: Whats the current on the 12v rail?**
A: Not sure would presume standard current

## Customer Reviews

### ⭐⭐⭐⭐⭐ Inexpensive SFX PSU which does the job
*by R***S on 3 September 2023*

Purchased as a replacement PSU for an old Netgear ReadyNAS Ultra 6, which had a Seasonic SS-300SFD PSU. This item fitted perfectly and works fine.One unknown for me was how many connectors of different types this PSU has. I needed three 4-pin MOLEX and fortunately it had four of them. I've uploaded a photo of the info from the side of the box.

### ⭐⭐⭐⭐⭐ Does the job
*by A***R on 17 February 2022*

Good price and easy to install in place of the defunct unit. I now realise the old PSU was probably quite expensive and designed to be quiet. This one is cheap and works, but the fan is quite noisy. Still, it brought my ancient PC back from the dead and I suppose a noisy working PC is better than a quiet dead one!

### ⭐⭐⭐⭐ Fit for purpose and good price...
*by D***E on 4 September 2014*

This was a replacement for the same part on my HTPC (Home Theater PC), when the old one died when i was tinkering with it! This fits the case properly (not many mATX PSUs around) and is quiet enough. The fan spins up when temps increase, but that's to be expected really. All in all fits the purpose for a great price.

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**Shop now:** [https://www.desertcart.com.br/products/48747458-cit-m-300u-300w-micro-atx-power-supply](https://www.desertcart.com.br/products/48747458-cit-m-300u-300w-micro-atx-power-supply)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-28*