We build systems to your specification

Total Price:

Exc. VAT : £ 35.90
Inc. VAT : £ 43.08

Seasonic 250Su 1u Slim Flex Psu

Sold Out

Exc. VAT : £ 35.90
Inc. VAT : £ 43.08

The Seasonic industrial level switch mode power supplies offer a reliable source for a wide range of setups. Our Flex ATX range with its full range AC input comes in 250 W and 200 W versions and is the ideal choice for workstations, standard or advanced servers and various automation or communication applications. These units comply with the latest PFC harmonics and are protected against short circuit, over voltage and over power. Their super low noise fan control makes them a pleasant companion in any industrial system.

  • Flex ATX v1.0 compliant
  • Forward converter circuit
  • High efficiency and reliability
  • Zero minimum load on 3.3 V rail
  • 40 mm double ball bearing fan
  • Super low noise fan control
  • Short circuit protection on all outputs
  • Over voltage protection
  • Over power protection
  • 100 % HiPot test
  • 100 % Burn-in, high temperature cycled on/off
  • PFC harmonics compliance: EN61000-3-2: 2006 + A1: 2007 + A2: 2009
Model DC Outputs
+3.3 V +5 V +12 V Combined -12 V +5 Vsb Total continuous power Input Type
(80 PLUS® Bronze)
14 A 17 A 18 A 0.8 A 2 A 250 W Full range
110 W (max.) 216 W
Input frequency 50 / 60 Hz
Efficiency (at normal input voltage) > 80 % (250SU only)
Dielectric withstand, input to frame/ground 1800 VAC, 1 sec
Dielectric withstand, input to output 1800 VAC, 1 sec
Line regulation ± 1 % (typical)
Load regulation ± 5 % (typical)
Cross regulation ± 5 % (typical)
MTBF, full load @ 25 °C ambient (excl. DC fan) > 100,000 hours
Active Power Factor Correction 99 % (typical)
Customer Reviews
4.2 Based on 5 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
    Matthew H.
    United Kingdom
    Expensive for what it is, but worth it.

    It's a seasonic supply which is good news, given the form factor I can appreciate that they're not so common but it felt a bit dear, especially since the 12V output is sadly spread over two rails, for boards which actually utilize the provided 8-Pin CPU power connector, you'll undoubtedly be cutting it thin despite the generous power ratings. As for noise, I didn't have any expectation for this PSU to be quiet, it's not super loud which is good meaning it might be suitable for a small SOHO rackmount PC. I put this PSU in an x-case 10" deep 1U chassis, which fit perfectly and it is being used as a firewall appliance for a home office. I added an expansion card and an SSD, the board is a low power chip (10W TDP) so I'm certainly not stretching this PSU at all, I wouldn't be comfortable running a modern i7 or E3 chip inside this board though. Especially if there were a few drives installed.

    A X-Case.co.uk Ltd Customer
    Lester C.
    United Kingdom
    Service as expected

    So hassling to get useless reviews is pointless

    Dave P.
    United Kingdom
    Fantastically quiet little PSU

    Not only was this a great value replacement for the PSU that had failed on my HP Microserver but it is a greater capacity than the original and is near silent running too. Noise is not normally a huge concern for server PSU's but when it's running at home 24/7 I was really pleased that I can now barely hear that the machine is running - a huge improvement to the old supply. Delivery and service from X-Case was excellent too. Thank you! Dave

    Jamie S.
    United Kingdom
    Fantastic little power supply! Super quiet!

    I'm really pleased with this power supply, fits great in a super short 1U mini-ITX case. I can barely hear it even if I put my ear next to it which I'm really impressed with. I was worried it would be really loud. Reasonable mix of connectors. 24 pin ATX, 4+4 EPS, 2x SATA, 1x Molex.

    X-Case.co.uk Ltd Seasonic 250Su 1u Slim Flex Psu Review
    Very Good

    Very Good, Very Good, Very Good, Very Good, Very Good, Very Good

    X-Case.co.uk Ltd Seasonic 250Su 1u Slim Flex Psu Review