MSI MAG A550BN 550W Power Supply
The MSI MAG A550BN is a reliable 550W ATX power supply engineered for mainstream PC builds that demand stable, efficient power delivery. With 80 PLUS Bronze efficiency rated up to 85%, this power supply minimizes energy waste while keeping your system running cool and quiet. Whether you're building a gaming rig, workstation, or general-purpose PC, the MAG A550BN provides the consistent performance and protection your components need.
Featuring active PFC technology, a single +12V rail with 45.5A capacity, and comprehensive protection mechanisms, this compact ATX PSU is built for long-term reliability. The low-noise cooling fan ensures whisper-quiet operation, making it ideal for both performance-focused and silent-build enthusiasts.
Key Features
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550W Power Output — Sufficient capacity for mainstream gaming and productivity builds
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80 PLUS Bronze Certified — Up to 85% efficiency reduces power consumption and heat generation
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Active PFC (Power Factor Correction) — Improves power quality and system stability
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Single +12V Rail Design — 45.5A capacity ensures stable voltage delivery to modern CPUs and GPUs
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Wide Input Range — 100–240 VAC at 50–60 Hz for global compatibility
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Compact Chassis — Space-efficient design fits standard ATX cases
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Low-Noise Cooling Fan — Optimized thermal management with minimal acoustic impact
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Multi-Layer Protection — Over-voltage, over-current, and short-circuit protection for component safety
Technical Specifications
| Specification |
Details |
| Manufacturer |
MSI |
| Part Number |
MAGA550BN |
| Power Output |
550W |
| Form Factor |
ATX |
| Efficiency Rating |
80 PLUS Bronze (up to 85%) |
| +12V Rail |
Single rail, 45.5A |
| Input Voltage |
100–240 VAC, 50–60 Hz |
| PFC Type |
Active PFC |
| Protection Features |
Over-voltage, over-current, short-circuit protection |
| Cooling |
Low-noise fan |
| Chassis Design |
Compact |
Frequently Asked Questions
Is the MSI MAG A550BN suitable for gaming PCs?
Yes, the 550W capacity and single +12V rail with 45.5A make this power supply well-suited for mainstream gaming builds. It provides stable power for mid-range GPUs and modern CPUs, though high-end enthusiast systems may benefit from higher wattage.
What does 80 PLUS Bronze efficiency mean?
80 PLUS Bronze certification guarantees at least 80% efficiency at 50% load, with this unit reaching up to 85% efficiency. This means less energy is wasted as heat, reducing your electricity bills and improving overall system reliability.
Does the MAG A550BN include protection against power surges?
Yes, the power supply features comprehensive multi-layer protection including over-voltage, over-current, and short-circuit protection to safeguard your PC components from electrical faults and unstable power conditions.
Can I use this power supply in different countries?
Absolutely. The wide input range of 100–240 VAC at 50–60 Hz ensures global compatibility, making the MSI MAG A550BN suitable for use in virtually any country without requiring a voltage converter.
