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Small black 4 cm PWM cooling fan with four wires

TSUJ

TSUJ Kepler-C72J-OYS-0391 2 in 1 accessory

SKU CH-24QN-66NKV

A 4 cm, 4-wire PWM cooling fan running at 12 V and 0.67 A for 2-in-1 laptop thermal management

  • Key featuresDC12 V 0.67A W40S12BS3D5-57T03A3 4028 4 cm 4-Wire PWM Coolin
  • 12 V DC power with 0.67 A current draw
  • 40 mm 4-wire PWM fan for precise speed control
  • 4028 model fits compact 2-in-1 cooling slots
  • New condition ensures reliable out-of-box operation

Compact 4 cm PWM cooling fan for 2-in-1 devices

This TSUJ accessory is a 40 mm square fan built for DC 12 V systems that require a 4-wire PWM connection. It suits technicians and owners of compatible 2-in-1 laptops who need a direct replacement or a spare cooling module. The unit is supplied new and identified by part number Kepler-C72J-OYS-0391.

Low-speed operation at 0.67 A keeps noise

Rated at 0.67 A, the fan draws only a small fraction of a 12 V rail while the PWM control adjusts speed to thermal demand. In typical use the motor runs quietly and the 4-wire interface allows the host system to regulate airflow without running at full speed continuously.

How it compares

Measured against everything we stock in 2-in-1 Device Accessories, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 96% of the 7,473 comparable items (median $56.99).

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Specifications

Product
Brand nameTSUJ
Part numberKepler-C72J-OYS-0391

Questions about this item

How do I connect the 4-wire PWM fan to the 12V header and which pin is the PWM signal?

Plug the 4-pin connector into a 12V PWM header; the fourth wire carries the PWM control signal while the other three deliver 12V power and ground.

When should I replace the 4028 cooling fan and what signs indicate bearing wear?

Replace the fan if RPM drops below spec, noise increases, or vibration appears; the 0.67A draw at 12V should remain steady during normal operation.

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