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Rectangular black ATX power supply with 120 mm fan and modular cables visible

Cooler Master

Cooler Master MPX-5501-ACAAB-U1 550 W power supply

SKU CH-VMEX-HX6VR MPN MPX-5501-ACAAB-U1

A 550 W ATX power supply with a 120 mm fan, active PFC and 80 PLUS Bronze efficiency, fully modular with two 6+2-pin PCIe and four SATA connectors

  • TypeIntel ATX 12V V2.31
  • Maximum Power550 W
  • Fans1 x 120 mm fan
  • PFCActive
  • Main Connector20+4Pin
  • PCI-Express Connector2 x 6+2-Pin
  • 80 PLUS Bronze certification reduces wasted energy with 85% typical efficiency
  • 550 W continuous output powers mid-range builds through a single 12 V rail at 43 A
  • 120 mm LDB-bearing fan runs quietly while keeping temperatures low
  • Modular cables simplify builds by letting you connect only the 20+4-pin, 4+4-pin CPU, two 6+2-pin PCIe and four SATA leads you need
  • Compact 140 mm depth fits tight cases and leaves room for cable routing

Cooler Master MWE 550 W Bronze PSU

This Cooler Master MWE unit delivers 550 W through an Intel ATX 12V v2.31 design. It targets mainstream desktop builders who need reliable power for mid-range components. The 80 PLUS Bronze rating confirms typical efficiency of 85 %. A single 120 mm fan with a durable LDB bearing keeps noise low while the DC-DC circuit design provides stable voltage rails.

Check case clearance and cable needs before ordering

The power supply measures 140 mm in length so verify that your chassis can accommodate it. Ensure the motherboard accepts the 20+4 pin main connector and the 4+4 pin CPU connector. Two PCIe 6+2 pin cables support most mid-range graphics cards. Four SATA connectors and three peripheral 4-pin connectors cover typical storage and accessory requirements. Input voltage spans 100 to 240 V at 50 or 60 Hz for worldwide use.

Upgrade from older group-regulated

Replacing a group-regulated design with this DC-DC topology improves cross-load stability on the +12 V rail which delivers 43 A. The Bronze certification reduces waste heat compared to unrated supplies. Over-voltage and overload protection add safety for connected hardware. Hold-up time of 16 ms at 80 % load and a power-good signal of 100 to 500 ms meet standard ATX requirements. The MTBF rating exceeds 100 000 hours.

Highlights

  • 80 PLUS Bronze certification reduces wasted energy with 85% typical efficiency
  • 550 W continuous output powers mid-range builds through a single 12 V rail at 43 A
  • 120 mm LDB-bearing fan runs quietly while keeping temperatures low
  • Modular cables simplify builds by letting you connect only the 20+4-pin, 4+4-pin CPU, two 6+2-pin PCIe and four SATA leads you need
  • Compact 140 mm depth fits tight cases and leaves room for cable routing

Specifications

BrandCooler Master
SeriesMWE Series
ModelMPX-5501-ACAAB-U1
TypeIntel ATX 12V V2.31
Maximum Power550 W
Fans1 x 120 mm fan
PFCActive
Main Connector20+4Pin
PCI-Express Connector2 x 6+2-Pin
SATA Power Connector4
Max PSU Length140 mm
Power Good Signal100-500ms
Hold-up Time16ms at 80% load
Efficiency85% Typically
Energy-Efficient80 PLUS BRONZE Certified
Over Voltage ProtectionYes
Overload ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current8 - 4 A
Output+3.3V@22A, +5V@20A, +12V@43A, [email protected] , [email protected]
MTBF>100,000 Hours
ApprovalsTUV-RH, CE, CCC, KC, EAC, RCM, cTUVus, FCC, BSMI
ConnectorsMB 20+4 Pin x 1
CPU 12V 4+4 Pin x 1
SATA x 4
Peripheral 4 Pin x 3
FDD Cable 4 Pin x 1
PCI-e 6+2 Pin x 2
Dimensions5.90" x 5.50" x 3.39"
Weight4.20 lbs.
Shipping weight2.06 kg
Package size269 × 198 × 117 mm

Questions about this item

What cables are included and what must be purchased separately?

The box provides a 20+4-pin motherboard cable, a 12V 4+4-pin CPU cable, four SATA power plugs, three 4-pin peripheral plugs, one floppy-style 4-pin plug and two PCI-e 6+2-pin connectors. No extra cables are needed for a standard build.

How do I choose between the available versions or capacities?

This model is a single 550 W unit; there are no alternative wattage or capacity options to select from.

What does the 550 W rating mean once the unit is installed in a real system?

The 550 W label is the maximum continuous output. The +12 V rail delivers up to 43 A, the +5 V rail up to 20 A and the +3.3 V rail up to 22 A, with typical efficiency of 85 percent under load.

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