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Small square 40mm server fan with black frame and visible blades

Fans

Fans 4028 40*40*28 12V 4W double ball bearing alarm

SKU CH-XBMQ-X18YS

A 40 × 40 × 28 mm server fan with double ball bearings, 12 V operation and a 3-wire alarm signal

  • 40 × 40 × 28 mm footprint fits tight server bays
  • 12 V 4 W draw keeps power budget low
  • Double ball bearing extends operating life
  • 3-wire alarm signal warns of fan failure

Compact 40 mm server fan

This 40 mm square fan fits the 4028 form factor and runs on 12 V power. It uses a double ball bearing for durable operation in server and workstation chassis. A three-wire connection provides speed monitoring for system management. The integrated alarm signals faults to prevent overheating.

4 W airflow for tight spaces

The 4 W motor delivers focused cooling where larger fans cannot fit. It handles restricted airflow paths in 1U racks and dense storage arrays. Headroom drops when static pressure exceeds the impeller curve or when ambient temperatures push beyond the rated range. Builders needing higher volume or silent running should consider larger frame sizes.

Highlights

  • 40 × 40 × 28 mm footprint fits tight server bays
  • 12 V 4 W draw keeps power budget low
  • Double ball bearing extends operating life
  • 3-wire alarm signal warns of fan failure

Specifications

No published specifications for this item yet.

Questions about this item

Will the 3-wire connector on this 4028 fan work with my older motherboard header?

The 3-wire connector provides power, ground and a tachometer signal so it fits standard 3-pin or 4-pin headers on older boards.

How can I confirm the alarm function on the PMD1204PQB1-A is active after installation?

If the fan stalls or drops below its rated speed the third wire sends a low-speed signal that most BIOS or monitoring software will flag as an alarm.

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