QNAP PSU f/TS409U power supply unit 250 W Silver

The QNAP PSU f/TS409U is a 250 W internal power supply designed for 1U rackmount and Intel-based 4/5/6-bay NAS and NVR systems. With a non-modular cabling design and compact dimensions (75 mm × 218 mm × 54 mm), this silver unit provides stable power delivery for compatible QNAP models such as the TS-439 Pro and 459 Pro+.

Advantages

This 250 W power supply offers reliable, continuous output suitable for small rackmount NAS and NVR systems. Its compact form factor fits 1U chassis and its fixed (non-modular) cabling reduces internal complexity. The unit’s construction and compatibility with specific QNAP models help ensure straightforward replacement and system stability.

Suitable for

• 1U rackmount NAS and NVR systems
• Intel-based 4-bay, 5-bay and 6-bay QNAP NAS models (example: TS-439 Pro, 459 Pro+)
• Server replacements and spare-parts inventory for compatible QNAP devices

Key specifications

• Total power: 250 W
• Cabling: non-modular (fixed)
• Dimensions (W×D×H): 75 × 218 × 54 mm
• Colour: Silver
• Weight: 0.95 kg
• Manufacturer part number (MPN): SP-4BAY-PSU
• EAN: 4712511121988

How to use

Power down the NAS or NVR and disconnect mains power before replacing the unit. Remove the old power supply according to the device service manual, install the QNAP PSU f/TS409U in the same mounting position, and reconnect the internal cables firmly. After reassembly, restore mains power and verify normal system boot and stable power delivery.

Recommendations

Use the PSU only in compatible QNAP models and follow the device manufacturer’s instructions for safe replacement. Ensure the system firmware is up to date and that cooling and ventilation are adequate to maintain reliable operation.