For DPS-250AB-44B 250W 1U Power Supply — Compatible with NAS 531 / 1815 / 1515

Replacement power supply unit for NAS models 531, 1815 and 1515. Part number DPS-250AB-44B (also listed as DPS-250AB-44 B) delivers 250W in a 1U form factor. Designed as a direct-fit replacement to restore power to compatible NAS systems — confirm the DPS-250AB-44B part number matches your device before purchase.