MSI MAG A550BN 550 Watt 80 Plus Bronze SMPS

The MSI MAG A550BN is an ATX form factor power supply unit rated at 550 watts, carrying the 80 PLUS Bronze certification which indicates efficiency up to 85% under typical load conditions. Designed with the DIY PC builder and entry-level gamer in mind, it delivers a stable and reliable power foundation without unnecessary complexity. At the heart of the MAG A550BN is a DC-to-DC circuit design. This topology converts power on secondary rails using dedicated DC-to-DC conversion, reducing output voltage ripple and delivering cleaner, more stable power to your CPU, memory, and storage devices. Paired with Active Power Factor Correction (Active PFC), the unit draws power from the mains more efficiently, minimising reactive power waste — a practical benefit for users on variable-frequency grid power common across India. Thermal management is handled by a 120mm fan equipped with a sleeve bearing. The sleeve bearing design keeps noise levels low during everyday and gaming workloads while maintaining adequate airflow across internal components for sustained heat dissipation. Protection is comprehensive. The MAG A550BN integrates Over Current Protection (OCP), Over Voltage Protection (OVP), Over Power Protection (OPP), Over Temperature Protection (OTP), and Short Circuit Protection (SCP). Together these five mechanisms safeguard connected components against electrical faults and unexpected load spikes. The connector set covers a broad range of mid-range builds: two PCIe 6+2-pin connectors support a discrete graphics card, five SATA connectors accommodate multiple storage drives, and two 4-pin peripheral connectors serve fans, pump controllers, or legacy devices. The unit operates on a universal input voltage range of 100–240 V AC at 50–60 Hz, making it suitable for use across different regions and power environments. MSI backs the MAG A550BN with a 5-year limited warranty, reflecting confidence in the unit's long-term reliability for everyday computing and light gaming use. Verified Specifications: - Model: MAG A550BN - Rated Output: 550 W - Form Factor: ATX - Certification: 80 PLUS Bronze (up to 85% efficiency) - PFC: Active PFC - Circuit Design: DC-to-DC - Fan: 120 mm sleeve bearing - Input Voltage: 100–240 V AC - Input Frequency: 50–60 Hz - Input Current: 8.0 A max at 115 V AC; 4.0 A max at 230 V AC - Dimensions: 150 mm × 140 mm × 86 mm - PCIe Connectors: 2 × 6+2-pin - SATA Connectors: 5 - Peripheral (4-pin) Connectors: 2 - Protections: OCP, OVP, OPP, OTP, SCP - Warranty: 5 Years (limited)