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header-product Power supply unit Seasonic SS-400 H2U 400 W, 20+4 pin ATX, 80 PLUS Gold, stainless steel

Power supply unit Seasonic SS-400 H2U 400 W, 20+4 pin ATX, 80 PLUS Gold, stainless steel

Seasonic SS-400 H2U 400 W ATX power supply Photo 1
Seasonic SS-400 H2U 400 W ATX power supply Photo 2
Seasonic SS-400 H2U 400 W ATX power supply Photo 3
Seasonic SS-400 H2U 400 W ATX power supply Photo 4
Seasonic SS-400 H2U 400 W ATX power supply Photo 1
Seasonic SS-400 H2U 400 W ATX power supply Photo 2
Seasonic SS-400 H2U 400 W ATX power supply Photo 3
Seasonic SS-400 H2U 400 W ATX power supply Photo 4
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Short description

Seasonic SS-400 H2U is a 400 W ATX power supply with a 20+4 pin motherboard connector and Active PFC. Certified 80 PLUS Gold for high efficiency, it supports AC input 100–240 V at 50–60 Hz. Compact stainless steel housing with a single 60 mm fan provides cooling. Designed for desktop PCs requiring reliable, efficient DC power delivery.
Warranty: 2 Years
SKU: 2077437
Manufacturer: SEASONIC
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Product information

Description

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.

Usage 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.

Specifications

Total power:
400 W
Motherboard power connector:
20+4 pin ATX
80 PLUS certification:
80 PLUS Gold
Fan diameter:
60 mm
Product colour:
Stainless steel
All features

Power

Total power:
400 W
Combined power (+3.3V):
130 W
Combined power (+12V):
348 W
Max output current (+3.3V):
20 A
Max output current (+12V):
29 A
Max output current (+5V):
21 A
Max output current (-12V):
0.8 A
Max output current (+5Vsb):
3 A
AC input frequency:
50 - 60
AC input voltage:
100 - 240

Ports & interfaces

Motherboard power connector:
20+4 pin ATX

Performance

Purpose:
PC
80 PLUS certification:
80 PLUS Gold

Design

Fan diameter:
60 mm
Number of fans:
1 fan(s)
Product colour:
Stainless steel

Weight & dimensions

Height:
70 mm
Width:
225 mm
Depth:
100 mm

Description

Machine translation. Load original

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Customer reviews

Customer questions

FAQ

What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All SEASONIC products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized SEASONIC service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: total power, motherboard power connector, 80 plus certification, fan diameter, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.
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14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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Quality Since 2008 AiO.lv has been on the market for over 18 years and has earned trust — with more than 6000 genuine positive reviews on Google.