The MSI MAG A300N-H 300W 80 Plus Non-Modular Power Supply is a compact and efficient power solution designed for entry-level PC systems, office setups, or budget-friendly home builds. Backed by MSI’s trusted engineering and quality assurance, this 300W PSU delivers stable power performance, reliable operation, and essential safety features—all within an affordable price range.

Built for low to moderate power consumption systems, the MAG A300N-H is ideal for users who don’t require high-wattage PSUs. Whether you're building a system with integrated graphics, a small form factor PC, or a basic workstation, this power supply can handle your essential components with ease. With its 300-watt power output, it provides sufficient energy to run processors, storage drives, and other vital hardware in compact or entry-tier builds.

One of its standout features is its 80 Plus certification, which ensures more than 80% efficiency under typical loads. This means reduced energy waste, lower electricity bills, and a cooler, more stable system. The improved efficiency also reduces heat generation, helping to extend the lifespan of your components.

 The MSI MAG A300N-H features a 120mm low-noise fan with optimized thermal control. This ensures quiet operation during regular usage, making it suitable for office environments or media center builds where noise levels are a concern. Even under extended usage, the fan provides sufficient airflow to keep internal temperatures in check.

For reliability and system safety, MSI includes multiple protection mechanisms such as Over Voltage Protection (OVP), Over Power Protection (OPP), Short Circuit Protection (SCP), and Over Temperature Protection (OTP). These built-in safeguards protect both the power supply and connected components from sudden electrical issues, giving you peace of mind during operation.

The non-modular design means all cables are pre-attached, simplifying the installation process for new builders. While this may limit cable management flexibility, it also ensures no critical cable is left out or misplaced. The available connectors include 1x 24-pin ATX, 1x 8-pin CPU, SATA connectors for storage devices, and peripheral cables for legacy components—perfectly covering the basic needs of an office or light-use PC build.

In terms of form factor, the MAG A300N-H complies with standard ATX PSU dimensions, ensuring compatibility with a wide range of micro-ATX and ATX chassis. Its compact build makes it especially useful for space-saving PC cases where larger PSUs may not fit.

If you’re building a cost-effective PC or upgrading from an older, less efficient power supply, the MSI MAG A300N-H 300W PSU offers great value, solid performance, and the trust of MSI’s proven design and quality standards. It’s an ideal choice for those who want dependable power delivery in a compact, energy-efficient form.

Key Features:

- 300W reliable power output  

- 80 Plus energy efficiency certification  

- Silent 120mm cooling fan  

- Built-in protection: OVP, OPP, SCP, OTP  

- Non-modular cabling for simplified setup  

- Ideal for budget, office, or compact builds  

- Backed by MSI reliability and build quality