ASUS Prime 550B 80+ Bronze ATX 2.0 Non Modular Power Supply ( 550W )

The ASUS Prime 550B is a 550W ATX non-modular power supply built for reliable, efficient desktop PC builds. Carrying an 80 PLUS Bronze certification, the unit delivers enhanced energy efficiency by converting AC power with reduced heat generation inside the chassis, which in turn supports a quieter acoustic profile during everyday use. At the heart of the cooling system is a 135 mm fan mounted on dual ball bearings. Dual ball bearings are rated for up to 80,000 hours of operational life — approximately twice the lifespan of sleeve bearing designs — making this an enduring choice for long-term system builds. The fan runs without 0 dB passive mode, maintaining active airflow to keep internal temperatures stable under load. The Prime 550B ships with etched, pliable cables that bend easily during routing and cable management. These cables are rated to operate at temperatures up to 50 °C below the safety limit and comply with UL1581 flame-test and UL758 certifications. The 4+4-pin CPU power connector features a distinct integrated clip and colour coding that simplifies identification and ensures a secure, confident connection to the motherboard’s CPU power header. Protection is comprehensive: the unit incorporates Over Power Protection (OPP), Over Voltage Protection (OVP), Under Voltage Protection (UVP), Short Circuit Protection (SCP), Over Current Protection (OCP), and Over Temperature Protection (OTP). The design is RoHS-compliant, and Active PFC supports a wide AC input range of 100–240 V, making it compatible with Indian mains supply. ASUS backs the Prime 550B with a 6-year warranty, reflecting confidence in the long-term durability of its components. Verified Specifications: – Model: PRIME-550B-BLACK – Total Output: 550 W – Form Factor: ATX12V – Efficiency: 80 PLUS Bronze – PFC Type: Active PFC – AC Input Range: 100–240 Vac – DC Output Rails: +3.3 V / +5 V / +12 V / -12 V / +5 Vsb – +12 V Max Load: 45.5 A (546 W combined) – Fan Size: 135 mm (dual ball bearing) – 0 dB Technology: No – MTBF: >120,000 hrs @ 25 °C – Protection: OPP, OVP, UVP, SCP, OCP, OTP – Dimensions: 150 × 150 × 86 mm – PSU Weight: 2.2 kg – Cable Connectors: 24/20-pin ATX × 1, CPU 4+4-pin × 1, PCIe 8-pin × 2, SATA × 5, Peripheral × 3 – Compliance: RoHS, UL1581, UL758 – Warranty: 6 years