MSI

MSI MAG A550BN 550W ATX Power Supply 80 PLUS Bronze

AC input voltage100 – 240 V
Cooling typeActive
Width150 mm
Motherboard power connector20+4 pin ATX

The MSI MAG A550BN is a 550W ATX desktop computer power supply built around 80 PLUS Bronze efficiency certification , making it a solid, no-nonsense foundation for a first-time PC build or a budget-conscious upgrade.

Description

Stable, Efficient Power Without the Complexity

550W output with a single 12V rail delivers clean, consistent power to your components
80 PLUS Bronze certified efficiency reduces wasted energy and keeps electricity costs in check
DC-to-DC circuit design tightens output voltage regulation for improved system stability
Active PFC improves power factor and helps protect against input voltage fluctuations
120mm low-noise fan with sleeve bearing keeps thermals under control without adding distracting sound

The MAG A550BN suits builders putting together an entry-level gaming PC, a home office desktop, or any mid-range ATX system where reliable, efficient power delivery matters more than modular cables or extreme wattage headroom.

Specifications

General

Brand	MSI
Model name	MAG A550BN
Product colour	Black
Purpose	PC
Efficiency	85
Cabling type	Non-Modular
Fan diameter	120
Number of fans	1
EAN	4719072849603

Processor

CPU power connector (4+4 pin)	Yes

Ports

EPS power connector (8-pin)	No
Floppy disk drive connector	Yes
Motherboard power connector	20+4 pin ATX
ATX Power connector (24-pin)	No
Floppy drive power connector	1
EPS power connector (4+4 pin)	Yes
ATX power connector (20+4 pin)	No
Number of SATA power connectors	5
PCI Express power connectors (6+2 pin)	2
Peripheral (Molex) power connectors (4-pin)	2

Keyboard & controls

On/off switch	Yes

Battery & power

AC input voltage	100 – 240 V
AC input frequency	50 – 60 Hz
Total power	550
Combined power (+5V)	110
80 PLUS certification	80 PLUS Bronze
Combined power (+12V)	546
Combined power (-12V)	3.6
Combined power (+3.3V)	110
Combined power (+5Vsb)	12.5
Max output current (+5V)	20
Max output current (+12V)	45.5
Max output current (-12V)	0.3
Power protection features	Over current/Over power/Over voltage/Overheating/Short circuit
Max output current (+3.3V)	20
Max output current (+5Vsb)	2.5
Maximum input current (@110V)	8
Maximum input current (@220V)	4
Motherboard power cable length	600
Power Factor Correction (PFC) type	Active
Power supply unit (PSU) form factor	ATX