# Power supply unit Lian Li RB0550B.B 550 W, 24-pin ATX, 80 PLUS Bronze, 135 mm fan, black

**URL:** https://aio.lv/en/product--lian-li-g9prb0550bb000eu--11656774
**Data updated:** 2026-01-16 17:58 (EET)
**Category:** Power Supplies (PSU)
**Manufacturer:** lian li
**Manufacturer code:** G9P.RB0550B.B000.EU
**EAN:** 4718466019264
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 60.49 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 49.99 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lian-li-g9prb0550bb000eu--11656774

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

The Lian Li RB0550B.B is a 550 W ATX power supply designed for desktop PCs. It delivers up to 550 W total power with 85% efficiency and 80 PLUS Bronze certification. Features include a 24‑pin ATX motherboard connector, 60 cm motherboard cable, 65 cm CPU cable, a 135 mm cooling fan and wide AC input (100–240 V, 50/60 Hz). Certified to CE/CB/cTUVus/TÜV/FCC/BSMI/CCC/KCC/SAA+RCM standards. Suitable for mainstream builds requiring reliable, efficient power and active cooling.

## Long description

The Lian Li RB0550B.B is a 550 W ATX power supply in classic black, designed for desktop systems that need stable, efficient power. It supports ATX 3.1 and includes a 24‑pin motherboard connector, a 135 mm temperature‑controlled fan, and a wide AC input range for compatibility with global power standards.
Advantages
The RB0550B.B combines compact dimensions with built‑in cable management to simplify PC builds: a 150 mm depth fits most ATX cases while integrated routing channels and Velcro straps on three sides keep CPU, main power and peripheral cables neatly secured. With native 12V‑2×6 support for modern GPUs, high‑quality 105°C capacitors, a robust single +12V rail and DC‑to‑DC architecture, it provides stable output and reduced voltage fluctuations. The 135 mm HYB smart fan provides effective cooling at lower RPMs for quieter operation, and 80 PLUS Bronze certification delivers up to 85% efficiency for everyday energy savings.
Suitable for
Mainstream desktop PCs and office systems
Compact ATX or minimalist case builds with limited depth
Users seeking tidy cable management and improved airflow
Systems with midrange GPUs and future GPU upgrades
Key specifications
Total power: 550 W
Efficiency: up to 85% (80 PLUS Bronze)
Form factor depth: 150 mm (compact ATX size)
Motherboard connector: 24‑pin ATX
CPU connector: 4+4 pin
PCIe support: native 12V‑2×6 to 6+2 PCIe (supports up to three 8‑pin GPU connectors on higher wattage models)
Fan: 135 mm temperature‑controlled HYB fan (0–1300 RPM)
Capacitors: rated 105°C
Operating temperature: up to 40°C
Protection features: OVP, UVP, OCP, OPP, OTP, SCP
AC input: 100–240 V, 50/60 Hz
Colour: black
How to use
Install the PSU into a compatible ATX case ensuring the 150 mm depth fits the chassis. Connect the 24‑pin ATX cable to the motherboard, attach the 4+4 CPU connector to the CPU power header, and use the modular SATA and peripheral cables only as needed. Route cables through the built‑in grooved channel and secure them with the Velcro straps on the PSU housing to maintain airflow and a neat interior layout. Verify all connections before powering on the system.
Usage recommendations
For reliable performance, allow adequate case ventilation and avoid operating the PSU above the specified 40°C ambient temperature. Use the modular cables supplied for peripherals to reduce clutter and ensure that GPU power demands do not exceed the unit’s rated 550 W when configuring high‑power components.

## Specifications

### Power

| Feature | Value |
|---|---|
| Total power | 550 W |
| Efficiency | 85 % |
| Power Factor Correction (PFC) type | Active |
| Power protection features | Under voltage, Under temperature, Short circuit, Over voltage, Over power, Over current |
| Combined power (+3.3V) | 100 W |
| Combined power (+12V) | 549.6 W |
| Combined power (+5V) | 100 W |
| Combined power (-12V) | 3.6 W |
| Combined power (+5Vsb) | 15 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V) | 45.8 A |
| Max output current (+5V) | 20 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 3 A |
| Input current | 10 |
| AC input frequency | 50/60 |
| AC input voltage | 100 - 240 |

### Ports & interfaces

| Feature | Value |
|---|---|
| Motherboard power connector | 24-pin ATX |
| ATX Power connector (24-pin) | Yes |
| Floppy disk drive connector | Yes |
| Floppy drive power connector | 1 |
| Number of SATA power connectors | 8 |
| Peripheral (Molex) power connectors (4-pin) | 3 |
| EPS power connector (8-pin) | Yes |
| CPU power connector (4+4 pin) | Yes |
| PCI Express power connectors (6+2 pin) | 4 |
| Cabling type | Non-Modular |
| Number of PATA power connectors | 3 |
| Motherboard power cable length | 600 mm |
| CPU power cable length | 650 mm |
| EPS power connector (4+4 pin) | Yes |
| Number of SATA power cables | 3 |

### Performance

| Feature | Value |
|---|---|
| Purpose | PC |
| 80 PLUS certification | 80 PLUS Bronze |
| Mean time between failures (MTBF) | 100000 h |
| Noise level | 33.2 dB |
| ATX version | 3.1 |
| Power supply unit (PSU) form factor | ATX |

### Design

| Feature | Value |
|---|---|
| Fan diameter | 135 mm |
| Number of fans | 1 fan(s) |
| Fan speed | 0 - 1300 |
| Product colour | Black |

### Certificates

| Feature | Value |
|---|---|
| Certification | CE/CB/cTUVus/TÜV/FCC/BSMI/CCC/KCC/SAA+RCM |

### Weight & dimensions

| Feature | Value |
|---|---|
| Height | 150 mm |
| Width | 86 mm |
| Depth | 150 mm |

## FAQ

### How much does the Lian Li RB0550B.B 550 W ATX PSU cost, and is it available for purchase?

The price is 60.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 239 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All lian li products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized lian li service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: total power, efficiency, motherboard power connector, 80 plus certification, fan diameter, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Lian Li RB0550B.B 550 W ATX PSU?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/11656774/66994608_large.webp