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Black rectangular ATX power supply unit with matte finish and 120mm fan grille

MSI

MSI MAG A550BN 550W 80+ Bronze power supply

SKU CH-AC5J-6390J MPN MAG A550BN

Delivers 550 W with 80 PLUS Bronze efficiency, a 120 mm low-noise fan, active PFC, DC-to-DC design and full protection in a compact 140 mm ATX unit

  • ColorBlack
  • TypeATX12V
  • Maximum Power550 W
  • Fans120mm
  • PFCActive
  • Main Connector20+4Pin

Options ATX 80+ Bronze (550W)

  • 80 PLUS Bronze certification cuts energy waste and lowers running costs
  • 120 mm low-noise sleeve-bearing fan keeps temperatures down quietly
  • DC-to-DC circuit design with single 12 V rail delivers stable voltage to components
  • Full protection suite OCP OVP SCP OPP OTP safeguards hardware from power faults
  • Compact 140 mm depth fits tight cases while supplying 550 W continuous power

Entry-Level 550 W ATX Power Supply

The MSI MAG A550BN is a non-modular ATX12V unit rated at 550 W with 80 PLUS Bronze certification. It targets builders assembling their first gaming or workstation PC who need reliable power without cable management complexity. A single +12 V rail and active PFC deliver stable output across 100–240 V input at 50/60 Hz.

Fixed Cable Set and Protection Suite

The hard-wired harness includes a 20+4-pin motherboard connector, two 6+2-pin PCIe plugs and five SATA power leads, covering a mainstream GPU and several drives in one install. DC-to-DC circuitry tightens voltage regulation while OCP, OVP, OPP, OTP and SCP safeguards shut the unit down under fault conditions.

Compact 140 mm Chassis with 120 mm Fan

At 140 mm deep the supply fits tight mini-tower cases, and the 120 mm sleeve-bearing fan keeps acoustic output low under load. Black finished steel housing and standard ATX mounting holes allow drop-in installation in any compatible chassis.

Punti di forza

  • 80 PLUS Bronze certification cuts energy waste and lowers running costs
  • 120 mm low-noise sleeve-bearing fan keeps temperatures down quietly
  • DC-to-DC circuit design with single 12 V rail delivers stable voltage to components
  • Full protection suite OCP OVP SCP OPP OTP safeguards hardware from power faults
  • Compact 140 mm depth fits tight cases while supplying 550 W continuous power

Caratteristiche tecniche

BrandMSI
ModelMAG A550BN
ColorBlack
TypeATX12V
Maximum Power550 W
Fans120mm
PFCActive
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector2 x 6+2-Pin
SATA Power Connector5
Max PSU Length140 mm
Energy-Efficient80 PLUS BRONZE Certified
Over Voltage ProtectionYes
ProtectionOCP / OVP / OPP / OTP / SCP
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current115Vac/8.0A max. 230Vac/4.0A max.
Output[email protected] , [email protected] , [email protected] , [email protected] , [email protected]
Dimensions5.91" x 5.51" x 3.39"
Peso di spedizione2.72 kg
Dimensioni del pacco254 × 203 × 152 mm

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Domande su questo articolo

Will this unit fit in a compact case with limited depth?

The housing measures 140 mm long, so it fits most standard ATX cases and many compact builds that accept a full-size PSU.

Can it power a mid-range graphics card with a single 8-pin connector?

Yes, the unit includes two 6+2-pin PCIe cables and a single 12 V rail rated for the full 550 W output.

Does the fan run quietly under typical gaming loads?

The 120 mm sleeve-bearing fan is designed for low-noise operation while maintaining adequate cooling.

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