The QNAP SP-469U-S-PSU 250W power supply is designed for select RP models TS-453U-RP, TS-853U-RP, TS-1253U-RP, TS-463U-RP, TS-863U-RP, TS-1263U-RP, TS-469U-SP/RP, TS-470U-SP/RP, TS-873U-RP, TS-453BU-RP, TS-853BU-RP, TS-1253BU-RP, TS-432XU-RP, TS-832XU-RP, TS-1232XU-RP, TS-463XU-RP, TS-453DU-RP, TS-432PXU-RP, TS-832PXU-RP, TS-1232PX RP.