Platinum 400 Fanless

The Platinum series is the culmination of all the experiences and knowledge base that Sea Sonic has gathered in the field of power supply design and production during its 40 years of history. A fanless power supply is undoubtedly the most innovative design on the market today and it has become extremely popular amongst users who require a silent working environment. The Seasonic Platinum series is a comprehensive and highly efficient product line that has won many international awards. And its Fanless members have been proven to provide unsurpassed silent performance.

SKU: SS-400FL2 Active PFC Categories: ,

80 PLUS®Platinum

The higher the level of efficiency of the power supply, the less power gets wasted in the form of excess heat . The 80 PLUS® Platinum certification guarantees greater than 90 %, 92 % and 89 % efficiency at 20 %, 50 % and 100 % operating loads, respectively. The Seasonic Platinum Series represents the highest level of technology and efficiency achievement of Sea Sonic during its 40 years of commitment to engineering excellence.

Fan Type Fanless-01 


Cooling fans inside the power supply are replaced by passive cooling based on heat dissipation. Silent operation does not only provide a more pleasant working environment but it also results in less power consumption and lower utility bills.

DC to DC Converter Design-01

DC to DC Converter Design

The step down DC to DC converter design allows the power supply to be able to serve system components with various voltage needs. Not only is it a flexible, clean voltage conversion solution but it also maximizes the 12 V DC rail output, delivers superior dynamic response and , ultimately, provides for greater system stability.

7 Years Warranty-01

7 Years Warranty

Our commitment to superior Seasonic quality.

Specifications are subject to change without prior notice.
Note: Since the beginning of 2015, Seasonic has implemented changes in its retail box design and modular cables are now packed in a black cardboard box.

Platinum 400 Fanless
AC InputVoltage: 100 V - 240 V
Current: 6 - 3 A
Frequency: 50 Hz - 60 Hz
DC OutputRail+3.3 V+5 V+12 V-12 V+5 VSB
Maximum Power20 A20 A33 A0.5 A2.5 A
125 W396 W6 W12.5 W
Total continuous power400 W
Platinum 400 Fanless Technical Specifications
Form FactorIntel ATX 12 V
Dimensions150 mm (W) x 160 mm (L) x 86 mm (H)
Fan InformationFan SizeNA
Fan ControlNA
Fan BearingNA
Life ExpectancyNA
Cable InformationModularityFully Modular
Cable typeFlat black cables
Electrical FeaturesOperating Temperature40 °C
MTBF @ 25 °C, excl. fan150,000 hours
AC InputFull Range
ProtectionOPP, OVP, UVP, OCP, OTP, SCP
Safety and EnvironmentalSafety and EMCcTUVus, TUV, C-tick, Gost-R, CB , BSMI, CCC, CE, FCC,
Environmental ComplianceEnergy Star, RoHS, WEEE, ErP Lot 6, REACH
Warranty7 Years
Packaging information
Units per carton4
Individual carton size330 (L) x 130 (W) x 195 (H) mm
Shipping carton size545 (L) x 215 (W) x 360 (H) mm
Specifications are subject to change without prior notice.

ConnectorConnector CountLengths
MAIN-POWER-24-20-PIN-A1610 mm - modular
PCIE-8-PIN-A1650 mm - modular
PCIE-6-8-PIN-1-A2600 mm - modular
600 mm - modular
SATA-5-PIN-A6400 + 120 + 120 + 120 mm - modular
300 + 120 mm - modular
PERIPHERAL-4-PIN-A5400 + 120 + 120 mm - modular
300 + 120 mm - modular
FDD-4-PIN-1-A1101 mm - modular
Specifications are subject to change without prior notice.






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Platinum 400 Fanless
Platinum 400 Fanless
Platinum 400 Fanless
Platinum 400 Fanless
Platinum 400 Fanless