Montech APX550 power supply unit 550 W 20+4 pin ATX ATX Black

The Montech APX550 power supply unit delivers up to 550 W of continuous power in an ATX form factor designed for standard desktop PCs. It accepts a wide AC input range (100–240 V) with 50/60 Hz frequency compatibility and provides a 20+4 pin ATX motherboard connector. The unit comes in a black finish, includes a single 120 mm fan for thermal management, and holds 80 PLUS White certification for basic efficiency standards. Compliance certificates include CB, CE, EAC, FCC, RCM, RoHS, UKCA and cTUVus.

Advantages

The Montech APX550 combines a compact ATX design with a 550 W total power rating suitable for typical office, home and entry-level gaming systems. The broad AC input range supports international voltage standards, while the 20+4 pin ATX connector ensures compatibility with a wide range of motherboards. A single 120 mm fan provides active cooling without adding excessive noise, and the black exterior integrates unobtrusively into most PC builds. The 80 PLUS White certification verifies baseline energy efficiency and the listed safety and regulatory certificates confirm compliance with common regional requirements.

Suitable for

• Office and home desktop computers
• Entry-level or budget gaming builds
• System upgrades where a reliable 550 W supply is required
• Small form factor ATX cases that accept standard ATX PSUs

Key specifications

• Total power: 550 W
• AC input voltage: 100–240 V
• AC input frequency: 50/60 Hz
• Motherboard connector: 20+4 pin ATX
• Form factor: ATX
• Efficiency certification: 80 PLUS White
• Cooling: 1 × 120 mm fan
• Colour: Black
• Compliance: CB, CE, EAC, FCC, RCM, RoHS, UKCA, cTUVus

How to use

Install the Montech APX550 into a compatible ATX PSU bay in your PC case, aligning screw holes and securing the unit with the supplied screws. Connect the 20+4 pin ATX connector to the motherboard main power socket, and attach any additional peripheral or CPU power connectors if present and required by your system. Ensure the AC mains cable is unplugged during installation. After all connections are secure, plug the AC cable into a properly grounded outlet and switch on the system while observing normal safety precautions.

Recommendations

For stable operation, match the Montech APX550 to systems whose combined component power draw remains comfortably below 550 W. Maintain adequate case airflow to complement the PSU's single 120 mm fan, and use a grounded power source or surge protector to reduce risk from voltage spikes. Periodically clean dust from the fan and vents to preserve cooling efficiency and prolong service life.