SORRY but this part has now been replaced by the SSP-250SUB, same size and spec. You can order this part by following this link here

SS-250SU 1U Flex power supply by Seasonic.

Manufacturer part number: SS-250SU APFC F0

Fitted with unique pluggable peripheral connector loom. Therefore if you only need the 20 + 4 way motherboard connection, you don't need to fit the peripheral connector loom as it unplugs. See picture.

80 Plus Bronze efficiency

Output Specifications

• Specification compliance Flex ATX v1.0 
• Forward Converter circuit
• Zero Minimum Load on 3.3v Rail 
• High Efficiency and Reliability Min 82% 100K hours
• Low Ripple and Noise
• Super Low Noise Fan Control (Temperature controlled)
• Short Circuit protection on all outputs
• OVP
• Over Power Protection
• 100% High Pot Test
• 100% Burn in, high temperature cycled on / off
• PFC harmonics compliance: EN61000-3-2 +A1 +A2
• 3 years from manufacting date warranty
• Same power supply as used in Synology NAS DS1812+, cable extension H-000092 would be required.

DC Outputs.

3.3v@14A, 5v@17A (110 watt combined)

12v@18A

-12v@0.8A

+5VSB@2A

Total Power= 250 Watt

Connections.

•  20 + 4 way Main Connector: 1

•  4-Pin Molex Peripheral 5.25 Connectors: 1

•  Floppy Drive Connectors: 1

•  SATA: 2

•  2 x 4 way connectors (Put together 1 x 8 way PCIE type) 

Size

150 x 81.5 x 40.6mm

Safety: cUL, TUV, CB, CCC, BSMI, GOST-R

EMC: CE, FCC,

MTBF: >100K hours

Efficiency: >82% (80 Plus Bronze)