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Square black 40 mm case fan with three wires

Fans

Fans 4028E12B-13 DC 12V 0.35A 3-wire 40x40x28mm case fan

SKU CH-F3BN-1CTS3

A 40 mm square, 28 mm thick DC fan running at 12 V and 0.35 A with a three-wire connection for speed monitoring

  • 12 V DC power for direct PSU connection
  • 35 A draw keeps system power budget low
  • 40 × 40 × 28 mm frame fits tight server chassis
  • 3-wire lead enables RPM monitoring by motherboard

Compact 40 mm server fan for tight builds

This 40x40x28 mm DC fan runs on 12 V and draws 0.35 A through a three-wire connector. It is designed for server chassis and small-form-factor cases where a 4028 profile is required. The slim frame fits narrow ducting and 1U spaces that larger fans cannot occupy.

Simple three-wire mounting with polarity care

The three-pin plug connects directly to a standard motherboard or fan-controller header; align the keyed connector to avoid reversed polarity. No PWM signal wire is present so speed control relies on voltage regulation only. Verify the header supplies 12 V before powering on to prevent start-up failure.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 67% of the 8,339 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the 12 V 0.35 A fan is spinning correctly after connecting the 3-wire header?

Check the motherboard BIOS or monitoring software for an RPM reading on the corresponding fan header; a steady value means the tachometer signal is working.

What comes in the box with the 40x40x28 mm cooler fan and do I need extra screws or a power adapter?

The package contains only the fan unit; standard 40 mm mounting screws and a 3-pin 12 V header on the board are required for installation.

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