Bequiet Straight Power 11 550w Gold Modular Power Supply BN281


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SKU: TT-PSU-0122 Categories: ,

World Class Quiet and Efficiency

be quiet! Straight Power 11 550W raises the bar for systems that demand virtually inaudible operation without power quality compromises. This PSU is clearly the best choice for super silent systems.

  • Virtually inaudible operation thanks to a Silent Wings 3 135mm fan
  • Big funnel-shaped fan opening of the PSU case for high airflow intake
  • Wire-free on the DC side inside the PSU for enhanced cooling and longevity
  • Modular cables for maximum build flexibility
  • 80 PLUS® Gold certification with an efficiency of up to 93%
  • Advanced stability and voltage regulation thanks to LLC, SR and DC-to-DC
  • Four high-performance 12Vrails
  • Two PCIe connectors for powerful GPUs
  • Japanese 105°C-rated capacitors ensure stability and reliability
  • Power signal stability unmatched in its class
  • ErP and Energy Star 6.1 ready
  • Product conception, design and quality control in Germany

General data

Model Straight Power 11 550W
Continuous power (W) 550
Peak power (W) 600
Form factor Version 2.4
Form factor EPS 12V Version 2.92
Modular cable management
Topology LLC + SR + DC/DC
Wire-free design (DC-side)
Voltage (Vac) 100 – 240
Frequency (Hz) 50 – 60
Input current (A) 8 / 4
PFC active
Power factor at 100% load >0.99
Compliant to Intel C6/C7
Power consumption in standby (W) <0.12
Average life time (h / 25°C) 100,000
Operating temperature up to (°C) 40


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 at 100% load (ms) 18
Power good signal 100 – 500ms

Fan / Cooling technology

Fan type Silent Wings 3
Motor technology 6-pole fan motor
Bearing technology FDB
Fan size (mm) 135
Max. fan speed (rpm), temperature-dependent 1500
Temperature control for case fans
dB(A) at 20% load 9
dB(A) at 50% load 9.5
dB(A) at 100% load 17.2


OCP (over current protection)
OVP (over voltage protection)
UVP (under voltage protection)
SCP (short circuit protection)
OTP (over temperature protection)
OPP (over power protection)
SIP (Surge & Inrush Protection)

Safety certification

RCM (Australia)
CU (Russia)

Eco / Efficiency

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

Environmental directives


Cables / Connectors

Nvidia<sup>®</sup> SLI (RTX 3090) ready
Cable management Modular
Sleeved cables Sleeved cables
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)
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
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
Cable ties
Velcro cable ties
Box/Bag for PSU/Cables
User manual languages DE, EN, ES, FR, PL, RU
OCK slot bracket with switch / OCK jumper
SFX-to-ATX adapter bracket


Express replacement service in first year DE, FR
International hotline / free of charge ✓ / DE, FR

Logistics data, RRP

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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Additional information

Weight 2.85 kg

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Bequiet Straight Power 11 550w Gold Modular Power Supply BN281


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