Cooler Master MasterWatt 550 550W 80 Plus Bronze Semi-Modular Power Supply

BH #COMPX5501AMA • MFR #MPX-5501-AMAAB-US
Cooler Master
Cooler Master MasterWatt 550 550W 80 Plus Bronze Semi-Modular Power Supply
Key Features
  • 550W Single +12V Rail
  • 120mm Cooling Fan
  • Intel ATX 12V Version 2.4
  • 2 x PCI-e Connectors
The MasterWatt 550 550W 80 Plus Bronze Semi-Modular Power Supply from Cooler Master is a standard ATX-sized power supply designed to provide your system with stable and reliable power. It can output up to 550W of power and includes all the cables you need for a regular single graphics card build. Moreover, it operates quietly and features multiple protection technologies to keep things operating smoothly.
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Cooler Master MasterWatt 550 Overview

  • 1Description
  • 280 Plus Bronze
  • 3Durable LDB Bearing Fan
  • 4Semi-Fanless Operation
  • 5Dual Forward & DC-to-DC Circuit Design
  • 6More Conductive PCI-e Cables
  • 7Protection

The MasterWatt 550 550W 80 Plus Bronze Semi-Modular Power Supply from Cooler Master is a standard ATX-sized power supply designed to provide your system with stable and reliable power. It can output up to 550W of power and includes all the cables you need for a regular single graphics card build. Moreover, it operates quietly and features multiple protection technologies to keep things operating smoothly.

80 Plus Bronze
The 80 Plus Bronze certification guarantees that MasterWatt delivers an average efficiency of 85% at full load.
Durable LDB Bearing Fan
This power supply is built with a Cooler Master 120mm Silencio FP fan, which combines sealed LDB (Loop Dynamic Bearing) bearings with quiet fan blades for durable, quiet cooling.
Semi-Fanless Operation
The MasterWatt operates silently at 0 dB when under 15% load. Past that, the fan starts spinning to dissipate heat.
Dual Forward & DC-to-DC Circuit Design
The Dual Forward and DC-to-DC circuit design offers reliable and stable power that's especially significant in +3.3 V and +5 V outputs.
More Conductive PCI-e Cables
The MasterWatt uses 16 AWG PCI-e cables for less resistance and better efficiency.
Protection
  • OCP (Over Current Protection)
  • OVP (Over Voltage Protection)
  • UVP (Under Voltage Protection)
  • OPP (Over Power Protection)
  • OTP (Over Temperature Protection)
  • SCP (Short Circuit Protection)
UPC: 884102034978

Cooler Master MasterWatt 550 Specs

Connectivity
Total Connectors1 x 20+4-Pin ATX Motherboard
1 x 4+4-Pin EPS CPU
6 x 15-Pin SATA
2 x 4-Pin Peripheral / Molex
1 x 4-Pin Floppy
2 x 6+2-Pin PCIe
Cable DesignSemi-Modular
Electrical
Total Wattage550 W
Combined Power for +12 V550 W
Max Load for +12 V45.8 A
Combined Power for +3.3/+5 V110 W
Max Load for +3.3 V20 A
Max Load for +5 V20 A
Max Power for +5 Vsb15 W
Max Load for +5 Vsb3 A
Max Power for -12 V3.6 W
Max Load for -12 V0.3 A
Peak Power750 W
AC Input Power100 to 240 VAC, 50 / 60 Hz
General
Efficiency Rating80 PLUS Bronze
Active Power Factor CorrectionYes
Efficiency85%
Hold up Time16 ms at 80% Load
Power-Good Signal100 to 500 ms
Cooling
Fan Size120 mm
Bearing TypeLoop Dynamic Bearing (LDB)
Environmental
Operating Temperature32 to 72°F / 0 to 40°C
Physical
Form FactorATX
ComplianceATX 12 V v2.4
ProtectionOver-Current Protection, Over-Power Protection, Over-Voltage Protection, Short-Circuit Protection, Under-Voltage Protection
CertificationsBSMI, CB, CCC, CE, EAC, FCC, RCM, TUV, cTUVus
*as per Manufacturer
Mean Time Between Failures (MTBF)100,000 Hours
Dimensions5.9 x 5.5 x 3.4" / 150 x 140 x 86 mm
Packaging Info
Package Weight5 lb
Box Dimensions (LxWxH)10.6 x 7.8 x 4.5"

Cooler Master MasterWatt 550 Reviews

Solid PS

By Ian
Rated 5 out of 5
Date: 2022-04-08

It seems to be working well so far.

Works

By Matthew
Rated 5 out of 5
Date: 2020-08-04

Good fan, blows air. Works well

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