Tired of unstable power that crashes your games or corrupts your files? A reliable Power Supply keeps every component fed with clean, steady electricity, so you can build or upgrade with confidence. The MSI (MAG A550BN) 550 W, 100 - 240 V, 8A, 4A, 50 - 60 Hz, 80+ Bronze ATX PSU delivers exactly that, offering efficient, quiet performance for entry-level builds.
Why Choose an MSI Power Supply
Many first-time builders worry about choosing the right wattage, fearing they’ll either waste money on excess capacity or limit future upgrades. Others are unsure which efficiency rating truly matters. This MSI Power Supply removes the guesswork: its 550 W output comfortably supports mid-range gaming rigs, while the 80 PLUS Bronze certification guarantees lower electricity bills and less heat. With active PFC and comprehensive protection circuits, you avoid common power-related failures without needing extra settings.
Key Features of a 550 W Power Supply
- 80 PLUS Bronze certification: 85 % efficiency. Saves energy and reduces heat output.
- DC-to-DC circuit design: stabilises voltage for consistent component performance.
- 12 cm low-noise fan: sleeve bearing keeps sound low while cooling efficiently.
- Single-rail +12 V: 45.5 A capacity ensures strong power delivery to GPU and CPU.
- Active PFC: improves power factor for cleaner draw from the wall outlet.
- Protection suite: OCP, OVP, SCP, OPP, OTP guard against overloads and short circuits.
- Non-modular cabling: fixed layout simplifies installation for beginners.
- ATX form factor: fits standard cases with dimensions 150 mm × 140 mm × 86 mm.
Usages of a 550 W Power Supply
Ideal for gamers building their first PC, budget-focused workstations, or anyone upgrading a mid-range system that needs reliable power without excess cost.
Benefits of MSI Power Supply
- Energy savings: high efficiency lowers your electricity bill.
- Quiet operation: low-noise fan reduces distraction during work or play.
- Peace of mind: built-in protections prevent damage to expensive components.
- Long-term reliability: five-year limited warranty backs lasting performance.
Specifications
| Power |
| Power protection features |
Over current, Over power, Over voltage, Overheating, Short circuit |
| Efficiency |
85% |
| Max output current (+5Vsb) |
2.5 A |
| Max output current (-12V) |
0.3 A |
| Max output current (+5V) |
20 A |
| Max output current (+12V) |
45.5 A |
| Max output current (+3.3V) |
20 A |
| Combined power (+5Vsb) |
12.5 W |
| Combined power (-12V) |
3.6 W |
| Combined power (+5V) |
110 W |
| Combined power (+12V) |
546 W |
| Combined power (+3.3V) |
110 W |
| Power Factor Correction (PFC) type |
Active |
| Maximum input current (@220V) |
4 A |
| Maximum input current (@110V) |
8 A |
| AC input frequency |
50 - 60 Hz |
| AC input voltage |
100 - 240 V |
| Total power |
550 W |
| Ports & interfaces |
| Cabling type |
Non-Modular |
| Floppy disk drive connector |
Yes |
| Floppy drive power connector |
1 |
| ATX power connector (20+4 pin) |
No |
| ATX Power connector (24-pin) |
No |
| CPU power connector (4+4 pin) |
Yes |
| PCI Express power connectors (6+2 pin) |
2 |
| EPS power connector (4+4 pin) |
Yes |
| EPS power connector (8-pin) |
No |
| Peripheral (Molex) power connectors (4-pin) |
2 |
| Number of SATA power connectors |
5 |
| Motherboard power cable length |
60 cm |
| Motherboard power connector |
20+4 pin ATX |
| Performance |
| 80 PLUS certification |
80 PLUS Bronze |
| Power supply unit (PSU) form factor |
ATX |
| Purpose |
PC |
| Design |
| On/off switch |
Yes |
| Number of fans |
1 fan(s) |
| Fan diameter |
12 cm |
| Cooling type |
Active |
| Product colour |
Black |
| Weight & dimensions |
| Height |
86 mm |
| Depth |
140 mm |
| Width |
150 mm |
