Power Supply Unit Seasonic SSP-300SUB 300 W

The Seasonic SSP-300SUB is a 300 W Flex ATX switch-mode power supply designed for server and industrial applications. It supports a full-range AC input (100–240 V), provides a 20+4 pin ATX motherboard connector, and uses an active cooling system with a 40 mm fan in a 1U form factor. Certified 80 PLUS Bronze, the unit targets efficient, compact power delivery for workstations, standard or advanced servers, and automation or communication systems.

Advantages

The SSP-300SUB delivers stable 300 W output with 80 PLUS Bronze efficiency and full-range AC input for worldwide operation. Its Flex ATX compact 1U design fits space-constrained server chassis and industrial enclosures, while the active cooling with a 40 mm fan and a low-noise fan control reduces audible disturbance in server rooms. The unit includes the standard 20+4 pin ATX connector for broad motherboard compatibility and a silver finish that suits professional installations.

Suitable for

• Rack or tower servers requiring a compact 1U Flex ATX PSU
• Workstations and small industrial PCs
• Automation and communication equipment with 100–240 V AC supply

Key specifications

• Total power: 300 W
• AC input voltage: 100–240 V (full range)
• Efficiency / certification: 80% (80 PLUS Bronze)
• Motherboard connector: 20+4 pin ATX
• Cooling: active, 40 mm fan
• Form factor: 1U Flex ATX
• Colour: Silver

How to use

Install the SSP-300SUB into a compatible Flex ATX or 1U chassis following the chassis manufacturer’s instructions. Connect the 20+4 pin ATX connector to the motherboard, secure any additional peripheral connections as required by your system, and connect the unit to a 100–240 V AC mains supply. Ensure adequate airflow around the PSU and confirm fan operation during initial power-up. Observe standard anti-static precautions when handling internal components.

Recommendations

Place the PSU in a chassis with unobstructed ventilation and avoid operating at ambient temperatures beyond the server manufacturer’s specified limits. For long-term reliability, operate the PSU below its maximum continuous load and ensure periodic dust removal from the fan and vents.