BeQuiet! Straight Power 11 550W Power Supply
550W, 80 Plus Gold, Fully Modular, up to 17.22 dBA, 5-Year Warranty
Only 1 left in stock 
£94.99 inc vat
£79.16 ex vat
550W, 80 Plus Gold, Fully Modular, up to 17.22 dBA, 5-Year Warranty
£94.99 inc vat
£79.16 ex vat
5 Year Warranty
80 Plus Gold
Fully Modular
Virtually Silent
Japanese 105°C
be quiet! Straight Power 11 550W raises the bar for systems that demand virtually inaudible operation without power quality compromises.
The high-end SilentWings® 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimized fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise, has a super-long life and minimal power consumption.
The fan inlet of the Straight Power 11 550W is funnel-shaped. It causes an increased throughput of air which benefits to a higher cooling performance.
An absolute innovation: The Straight Power 11 550W is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance, simply because of a lack of wiring, and ultimately pushes the lifetimes of the components to a maximum.
Thanks to the fully modular cable management, cables that serve no purpose in the system are left out. For this reason systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case.
Straight Power 11 550W is certified with 80PLUS® Gold efficiency, reaching up to 93%. This gives less power consumption and a cooler and quieter operation. Truly a benefit for any system.
The use of LLC and Synchronous Rectifier (SR) provides very stable operation and enhanced voltage regulation.The PSU is equipped with DC-to-DC conversion for tight voltage regulation even under heavy cross-loading conditions. This ensures reliable operation with the next generation of processors and graphics cards.
Only the best components are used in Straight Power 11 550W. That is why we have built only high-quality Japanese capacitors into the PSU chassis. They are rated to 105°C, ensuring stability, reliability and a long operating life.
| 12V rails (multi-rail operation) | 4 |
| 12V single rail operation | - |
| Overclocking key | - |
| +3.3V (A) | 24 |
| +5V (A) | 24 |
| +12V1 (A) | 18 |
| +12V2 (A) | 18 |
| +12V3 (A) | 20 |
| +12V4 (A) | 20 |
| +12V5 (A) | - |
| +12V6 (A) | - |
| -12V (A) | 0.3 |
| +5Vsb (A) | 3 |
| Max. combined power 12V (W) | 549.6 |
| Max. combined power 3.3V + 5V (W) | 130 |
| Hold-up time (ms @ 100%) | 18.9 |
| Fan type | be quiet! SilentWings 3 |
| +SilentWings | Yes |
| Motor technology | 6-pole fan motor |
| Bearing technology | FDB |
| Fan size (mm) | 135 |
| Max. fan speed (rpm), temperature-dependent | 1,500 |
| Temperature control for case fans | - |
| dB(A) at 20% load | 9.02 |
| dB(A) at 50% load | 9.46 |
| dB(A) at 100% load | 17.22 |
| OCP (over current protection) | Yes |
| OVP (over voltage protection) | Yes |
| UVP (under voltage protection) | Yes |
| SCP (short circuit protection) | Yes |
| OTP (over temperature protection) | Yes |
| OPP (over power protection) | Yes |
| CE | Yes |
| CB | Yes |
| TÜV | Yes |
| Nemko (N) | - |
| Semko (S) | - |
| Fimko (FI) | - |
| Demko (D) | - |
| FCC | Yes |
| cRUus | - |
| cTUVus | Yes |
| RCM (Australia) | Yes |
| BSMI | Yes |
| CU (Russia) | Yes |
| CCC | Yes |
| 80PLUS certification | Gold |
| Efficiency (%) at 230V, 20% load | 91.4 |
| Efficiency (%) at 230V, 50% load | 93 |
| Efficiency (%) at 230V, 100% load | 91.2 |
| ENERGY STAR | 6.1 |
| ErP | Yes |
| WEEE | Yes |
| RoHS | Yes |
| Multi-GPU ready | Yes |
| Modular cable management | Yes |
| Fully modular | Yes |
| Sleeved cables | Yes |
| Flat cables | - |
| Cable length to mainboard (cm) | 60 |
| Cable length to first connector (cm) | 55 |
| Maximum cable length (cm) | 115 |
| All-in-one cable (SATA/PATA/FDD) | Yes |
| No. of cables | 8 |
| ATX-Motherboard (20+4-pin) | 1 |
| P8 (CPU) | - |
| P4+4 (CPU) | 1 |
| P4 (CPU) | - |
| PCI-E 6-pin (GPU) | - |
| PCI-E 6+2-pin (GPU) | 2 |
| PATA 4-pin | 3 |
| SATA 15-pin (HDD, Drives) | 9 |
| FDD (Floppy) | 1 |
| External fan connectors | - |
| Dimensions without cable (L x W x D), (mm) | 160 x 150 x 86 |
| Weight (kg) | 1.51 |
| Color | Black |
| Thumb screws | - |
| Screws | Yes |
| Cable ties | Yes |
| Velcro cable ties | - |
| Box/Bag for PSU/Cables | - |
| User manual languages | EN, DE, FR, PL, ES, RU |
| OCK slot bracket with switch / OCK jumper | - |
| SFX-to-ATX adapter bracket | - |
| Warranty (Years) | 5 |
| Express replacement service in first year | DE, FR |
| International hotline / free of charge | Yes / DE, FR |
| Range | Straight Power |
| Article number | BN281 |
| EAN code | 4260052185766 |
| Dimensions, package (L x W x H), (mm) | 328 x 248 x 102 |
| Gross weight, package (kg) | 2.76 |
| Pieces per packaging unit | 6 |
| Dimensions, shipping box (L x W x H), (mm) | 651 x 282 x 346 |
| Gross weight, shipping box (kg) | 17.79 |
| RRP (€) | 115.00 |
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Order Code: BQ-BN281
£94.99 inc vat
£79.16 ex vat
