Platinum 520 Fanless

The Seasonic Fanless power supplies are defined by their complete silence, which rightfully makes them the most sought after units on the market today. Building on 80 PLUS Platinum® level of rating and with the use of high-grade components, these fanless power supplies are also extremely efficient. For the fact that they run cool and silent, they are perfect solutions for Home Theater PC (HTPC) or any other application where “silence is golden”. The Seasonic Platinum Series Fanless power supplies are tailored to satisfy the most demanding users who search for the ultimate quiet solution which is matched by a simple, elegant look.

SKU: SS-520FL2 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.

Japanese Capacitor-01

105 °C Japanese Capacitor

Premium quality Japanese capacitors with 105 °C rating increase overall reliability and extend product life.

7 Years Warranty-01

7 Years Warranty

Our commitment to superior Seasonic quality.

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.

Modular Cables-01 

Fully Modular Cables

In Sea Sonic’s patented design feature full modularity comes hand-in-hand with the extensive use of SMD technology to increase the overall performance and reliability of this power supply. The simple and inventive layout scheme helps to attain unsurpassed quality and performance, where efficiency is further enhanced by minimized line resistance, reduced voltage drop and lower impedance. Reduced component count and better space utilization facilitate optimal air flow inside the case and promote heat dissipation, proper cooling and ultimately longer product life.

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 520 Fanless
AC InputVoltage: 100 V - 240 V
Current: 7 - 4 A
Frequency: 50 Hz - 60 Hz
DC OutputRail+3.3 V+5 V+12 V-12 V+5 VSB
Maximum Power20 A20 A43 A0.5 A2.5 A
100 W516 W6 W12.5 W
Total continuous power520 W
Platinum 520 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-A4550 + 100 mm - modular
550 + 100 mm - modular
SATA-5-PIN-A6400 + 120 + 120 + 120 mm - modular
300 + 120 mm - modular
PERIPHERAL-4-PIN-A5400 + 120 + 120 mm
300 + 120 mm
FDD-4-PIN-1-A1101 mm
Specifications are subject to change without prior notice.






TechPowerUp | Editor’s choice

November 14, 2012

“This is not the first time that a Seasonic product manages to amaze me and it surely won’t be the last! The new fanless Platinum 520 W unit is a great performer with ultra-stable rails that deliver very clean outputs. Your choices are pretty limited if you are looking for a fanless PSU, especially if you seek a Platinum efficiency one. The Seasonic SS-520FL’s platform easily allows this unit to confront and eclipse its competition by providing top performance for a price that beats every other fanless Platinum PSU out there, which makes its purchase a no-brainer.”

(Read More)

eTeknix.com | Editor’s Choice

September 23, 2014

“It’s silent, it performs great and it looks fantastic ….so there are no marks for guessing it is made by Seasonic! If you’re in the market for a high quality fanless power supply then Seasonic have got you covered with their Platinum 520.http://www.eteknix.com/seasonic-platinum-fanless-520w-modular-power-supply-review/“

(Read More)

PROHARDVER | Recommended

July 3, 2013

“Seasonic Platinum Fanless: a tápok tápja”

(Read More)

Platinum 520 Fanless
Platinum 520 Fanless
Platinum 520 Fanless
Platinum 520 Fanless
Platinum 520 Fanless