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Small square black 40mm case fan with three wires

SXDOOL

SXDOOL JMC 4020-12 506340-014 40x40x20mm 12V 0.10A 3-wire case fan

SKU CH-W6A8-WP17A

A 40mm square, 20mm deep case fan running at 12V and 0.10A with a 3-pin connector

  • TypeCase Fan
  • Ultra-quiet 3-pin operation for low-noise builds
  • Compact 40x40x20mm frame fits tight chassis spaces
  • Efficient 12V 0.10A draw keeps power use minimal
  • Standard three-wire connector enables speed monitoring
  • JMC 4020-12 506340-014 model ensures exact replacement match

Compact 40 mm case fan for tight builds

The SXDOOL JMC 4020-12 measures 40 by 40 by 20 mm and runs on 12 V at 0.10 A. Its three-wire connector provides speed reporting to the motherboard. The small footprint suits compact chassis, small-form-factor PCs or targeted component cooling where larger fans cannot fit.

Low power draw and reported quiet operation

At 0.10 A the fan draws minimal current from a 12 V header. The manufacturer highlights ultra-quiet performance for normal use. The 3-pin design allows the system to monitor RPM, though voltage control rather than PWM governs speed changes.

Basic three-wire connectivity only

The bundle consists of the fan unit with its integrated 3-pin lead. No mounting screws, adapters, speed controllers or software utilities are included. Builders needing PWM control, RGB lighting or extra wiring length must source those separately.

Highlights

  • Ultra-quiet 3-pin operation for low-noise builds
  • Compact 40x40x20mm frame fits tight chassis spaces
  • Efficient 12V 0.10A draw keeps power use minimal
  • Standard three-wire connector enables speed monitoring
  • JMC 4020-12 506340-014 model ensures exact replacement match

Specifications

TypeCase Fan

Questions about this item

How do I install the 40mm x 40mm x 20mm fan and what is the common wiring mistake?

Mount the fan using the four corner screw holes on the 40mm frame, then connect the 3-pin plug to a 12V motherboard header or fan controller; the frequent error is reversing the three wires so the tachometer signal goes to ground.

What maintenance will the JMC 4020-12 need over time?

Dust the blades and frame every few months with compressed air; the sleeve bearing is not user-serviceable, so plan to replace the entire 4020-12 unit when noise or vibration increases.

What limit appears first when the 506340-014 runs continuously at 12V?

The 0.10A motor draws constant current, so the sleeve bearing’s lubricant life becomes the limiting factor, leading to rising acoustic noise before airflow drops noticeably.

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