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Home >
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Power Supplies>
500W To 550W>
80 PLUS Gold>
BeQuiet! Straight Power 11 550W Power Supply

BeQuiet! Straight Power 11 550W Power Supply

550W, 80 Plus Gold, Fully Modular, up to 17.22 dBA, 5-Year Warranty

BeQuiet! Straight Power 11 550W Power Supply
Only 2 left in stock question tooltip

£89.99 inc vat

£74.99 ex vat

payment types we accept

Order Code: BQ-BN281

Manf.Code: BN281

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Delivery options

Express Delivery

More delivery options including Weekend, timed and European delivery are also available at the checkout.

Finance options

Low Rate 14.9% Finance

Spread the cost of your purchase with a low rate 14.9% APR over 12, 24, 36 or 48 months.

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In the unlikely event that you are unhappy with your purchase, simply return it to us within 14 days for a refund.*

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BeQuiet! Straight Power 11 550W Power Supply overview

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.

SILENT WINGS® 3 FAN

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.

FUNNEL-SHAPED FAN OPENING

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.

WIRE-FREE DESIGN INSIDE THE PSU

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.

FULLY MODULAR CABLE MANAGEMENT

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.

80PLUS® GOLD CERTIFIED

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.

HIGH-CLASS TECHNOLOGIES

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.

JAPANESE 105° CAPACITORS

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.

Output

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 / Cooling technology

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

Protection

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

Safety certification

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

Eco / Efficiency

80PLUS certification Gold
Efficiency (%) at 230V, 20% load 91.4
Efficiency (%) at 230V, 50% load 93
Efficiency (%) at 230V, 100% load 91.2

Environmental directives

ENERGY STAR 6.1
ErP Yes
WEEE Yes
RoHS Yes

Cable management / Connectors

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 -

Casing

Dimensions without cable (L x W x D), (mm) 160 x 150 x 86
Weight (kg) 1.51
Color Black

Accessories

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 -

Service

Warranty (Years) 5
Express replacement service in first year DE, FR
International hotline / free of charge Yes / DE, FR

Logistics data, RRP

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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Delivery Options

Next Working Day Delivery

Get your order delivered the next working day for £5.99, available when ordering Monday - Thursday and before 17:00 on that day if the product is in stock and your payment has cleared.

Pre 12 Next Working Day Delivery

Get your order delivered the next working day before 12:00pm for £10.98, available when ordering Monday - Thursday and before 17:00 on that day if the product is in stock and your payment has cleared. Some orders if via PayPal and the first customer order may not clear in time.

Weekend Delivery - Saturday & Sunday

If you need your order at the weekend, for £12.58, you can specify the day you wish to have it delivered to you, Saturday or Sunday providing your order has been placed by 17:00 on the Friday before.

Economy Delivery

Economy delivery is available on all orders of any value being shipped within the UK.

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BeQuiet! Straight Power 11 550W Power Supply

Order Code: BQ-BN281

£89.99 inc vat

£74.99 ex vat