Lian Li RB Series Bronze Semi Modular 550W ATX 3.1 Power Supply

Power your mainstream PC build with the reliable and budget-friendly Lian Li RB Series 550W power supply. This 80 PLUS Bronze certified PSU delivers up to 85% efficiency under typical loads, ensuring reduced energy waste and minimal heat output. It is designed with native ATX 3.1 compliance for compatibility with modern hardware and supports continuous full-power output at 40°C. The RB Series features a unique built-in cable management system with a grooved channel and included velcro straps, making it easy to achieve a clean and organised build with improved airflow. For quiet performance, it utilises a 135mm hydraulic bearing fan, which is larger and quieter than typical 120mm fans found in similar units. This semi-modular design includes fixed essential cables like the 24-pin and CPU EPS, while SATA and peripheral cables are modular to reduce clutter. Built with high-quality 105°C electrolytic capacitors and a DC-to-DC design, the RB Series ensures stable, long-lasting performance and clean power delivery, and peace of mind with a full suite of industrial-grade protections.

Features

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Lian Li RB Series 550W Power Supply - Smart Routing, Cleaner Builds

Compact Size For High Compatibility

With a compact 150mm depth, the RB Series fits easily into most ATX cases, making it a great choice for space-conscious or minimalist builds without compromising on power.

Built for the Latest ATX 3.1 Standard

Fully compliant with the latest ATX 3.1 standard, this PSU supports next-gen hardware demands with native 12V-2x6 PCIe connectors for improved safety and power delivery. Engineered to handle high transient loads with greater efficiency, it's ready for the most demanding GPUs and future upgrades.

Note: The 12V-2x6 connector features a dual-color housing design on both sides. Ensure the blue part is fully inserted for a secure connection.

Smart Cable Management

The RB Series features a built-in deep routing channel and Velcro straps on three sides of the PSU housing to keep cables securely in place. Excess cables can be easily tucked away, while thick CPU and GPU power lines are neatly organised. This improves airflow, reduces clutter, and results in a cleaner and more professional build.

Unique Three-Sided Cable Routing and Bundling

Designed to perfectly accommodate back connectors and compact cases, the RB Series features key cables such as the CPU (4+4 pin), main power (20+4 pin), and SATA/peripheral connectors neatly secured with Velcro straps on three sides of the PSU housing. This smart cable management design not only enables clean and efficient cable routing but also frees up valuable space inside the case, resulting in a tidier and more professional-looking build.

Unique Cable Management System

The RB Series features a semi-modular design that offers flexibility without unnecessary clutter. While essential cables like the 24-pin and CPU EPS, PCIe 6+2 and 12V-2×6 are fixed, the SATA and peripheral cables are modular and can be connected only when needed. This allows users to eliminate unused cables from their build, reducing cable mess, especially helpful in cases with limited space or for users who don’t require legacy device support.

High-Quality 105°C Capacitors

Built with premium 105°C capacitors, a robust single 12V high-amperage rail, and reliable DC-to-DC architecture, this PSU delivers stable and consistent power output. These high-quality components form the foundation of stability—reducing voltage fluctuations and noise to ensure smooth performance, extended component lifespan, and dependable reliability even under continuous operation at up to 40°C.

Quiet Cooling, Stable Operation

Equipped with a 135mm HYB smart temperature-controlled fan, larger than the standard 120mm, the PSU delivers superior cooling performance even at lower fan speeds. This design not only improves heat dissipation but also helps reduce noise levels, ensuring efficient, quiet cooling for everyday tasks and stable operation under heavy workloads.

Reliable Efficiency, Everyday Savings

Certified 80 PLUS Bronze, the RB Series offers up to 85% energy conversion efficiency. It reduces heat and power consumption, making it an ideal and economical solution for everyday systems.

Enhanced Durability with Full Protection

Built to operate at up to 40°C, the RB Series features six industrial-grade protections: OVP, UVP, OCP, OPP, OTP, and SCP, ensuring stable power delivery even under harsh conditions.

Certified Safety & Protections

The RB Series is backed by international safety certifications, including CE, FCC, TUV, BSMI, and CB, ensuring reliable protections and consistent performance.

Included Cables