Reliable Power for PC Builds

The MSI MAG A550BN is a 550W ATX power supply designed for entry-level gaming and general-purpose desktop systems. Its DC-to-DC circuit design supports stable voltage output, while Active PFC helps manage power delivery efficiently.

80 PLUS Bronze Efficiency

The 80 PLUS Bronze rating provides efficiency of up to 85%, helping reduce wasted energy and excess heat during operation. 

Low-Noise Cooling

A 120mm low-noise fan with a sleeve bearing provides heat dissipation while helping keep operating noise controlled.

Circuit Protection

Built-in over-current, over-voltage, over-power, over-temperature and short-circuit protection mechanisms help safeguard the power supply and connected components.

System Connections

The fixed cable set includes motherboard, CPU, graphics card, SATA, peripheral and FDD connectors. Two PCIe 6+2-pin connectors support compatible graphics cards, while five SATA connectors accommodate multiple storage devices.

Product Specifications & Identifiers

• Brand: MSI
• Product range: MAG
• Product name: MAG A550BN
• Model: A550BN
• Product type: Desktop PC power supply
• Form factor: ATX
• Rated power: 550W
• Modular design: No
• Efficiency rating: 80 PLUS Bronze, up to 85%
• Circuit design: DC-to-DC
• PFC type: Active PFC
• Fan size: 120 mm
• Fan bearing: Sleeve bearing
• Input voltage: 100–240 VAC
• Input current: 8A at 115 VAC; 4A at 230 VAC
• Input frequency: 50–60 Hz
• Protection mechanisms: OCP, OVP, OPP, OTP and SCP
• ATX connector: 1 × 24-pin
• EPS connector: 1 × 4+4-pin
• PCIe connectors: 2 × 6+2-pin
• SATA connectors: 5 × 15-pin
• Peripheral connectors: 2 × 4-pin
• FDD connector: 1 × 4-pin
• +12V output: 45.5A, 546W
• Dimensions: 140 × 150 × 86 mm
• Warranty: One-year limited warranty