Voeding Seasonic SS-400 H2U 400 W, 20+4 Pin ATX, 80 PLUS Gold, RVS

Seasonic SS-400 H2U is a compact 400 W desktop power supply designed for standard ATX systems that require reliable and efficient DC power delivery. The unit features a 20+4 pin ATX motherboard connector, Active PFC for improved power factor, and 80 PLUS Gold certification that ensures high conversion efficiency across typical load ranges. Housed in a stainless steel chassis and cooled by a single 60 mm fan, this PSU is intended for space-constrained builds where stable power and thermal management are important.

Advantages

The Seasonic SS-400 H2U combines 80 PLUS Gold efficiency with Active PFC to reduce energy losses and improve voltage stability under varying loads. Its compact stainless steel housing provides structural durability and helps with heat dissipation, while the 60 mm fan offers targeted cooling for the internal components. The 20+4 pin ATX connector ensures compatibility with a wide range of motherboards, making the unit a practical choice for standard desktop configurations that need a reliable 400 W power source.

Suitable for

• Office and home desktop PCs with standard ATX motherboards
• Small form factor systems where chassis space is limited
• Systems requiring energy-efficient operation and lower heat generation
• PCs with modest component power demands—single GPU or integrated graphics setups

Key specifications

• Total output power: 400 W
• Motherboard connector: 20+4 pin ATX
• Efficiency certification: 80 PLUS Gold
• Input voltage range: AC 100–240 V, 50–60 Hz
• Cooling: single 60 mm fan
• Enclosure material and color: stainless steel
• Active Power Factor Correction (Active PFC) included

How to use

Install the Seasonic SS-400 H2U into a compatible ATX case, securing the unit with the mounting points provided by the chassis. Connect the 20+4 pin ATX cable to the motherboard main power socket and attach any required peripheral or drive power connectors as per your system configuration. Verify AC input is set to the correct supply and connect the AC power cord. After installation, power on the system and monitor initial operation for stable voltage and normal fan activity.

Recommendations

For reliable long-term operation, ensure adequate case airflow so the 60 mm fan can maintain proper thermal conditions. Use this 400 W power supply in systems with modest power draws and avoid overloading the unit near its maximum continuous output. Regularly check connections and keep dust away from the intake and exhaust areas to preserve efficiency and cooling performance.