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Square 40mm cooling fan with black frame and four-wire power connector

Ruth's sister

Ruth's sister W40S12BS1D5-07 40mm 12V 1.05A 4-line internal power cable

SKU CH-CCMM-ASKAM

40 mm 12 V 1.05 A 4-line server cooling fan delivers large airflow for power supplies

  • 40 mm frame fits tight server bays
  • 12 V 1.05 A delivers strong airflow
  • 4-line connector enables PWM speed control
  • 4028 model built for continuous cooling duty

40 mm 4-line server cooling fan

The Ruth's sister W40S12BS1D5-07 is a 40 mm internal cooling fan designed for server power supplies and compact enclosures. It operates at 12 V and draws 1.05 A through a four-wire power connection. The 4028 frame size fits standard 40 mm mounting points. This new component targets system builders who need reliable airflow in dense chassis.

Replaces worn or undersized 40 mm units

Install this fan when an existing 40 mm cooler has failed, become noisy, or cannot move enough air for the thermal load. The four-line interface supports speed monitoring and PWM control where the host hardware provides it. The upgrade is worth it when the original fan lacks the 1.05 A current rating or the 4028 form factor. Builders who need a different voltage, a larger frame, or a two-wire connector should look elsewhere.

Highlights

  • 40 mm frame fits tight server bays
  • 12 V 1.05 A delivers strong airflow
  • 4-line connector enables PWM speed control
  • 4028 model built for continuous cooling duty

Specifications

No published specifications for this item yet.

Questions about this item

What mounting hole spacing does the 40 mm fan need?

The 40 mm frame uses the standard 4028 mounting pattern with holes spaced for a 40 mm square footprint.

How is the 4-line power cable connected and what step is often missed?

Plug the 4-line connector into a 12 V header; the step often missed is seating all four pins fully so the 1.05 A circuit locks.

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