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Black USB cable with inline 3-speed controller and 4-pin fan connector, 50cm length

AJMRTC

AJMRTC USB 5V to 12V Step-Up Fan Cable 3-Speed 4-Pin 50CM

SKU CH-88QD-WC7MF

Converts USB 5V to 12V with inline three-speed control and off switch for 4-pin fans

  • Cable Length50CM

option 50CM

  • 50CM
  • 100CM

Struck-through versions exist but are not stocked here.

  • Boosts USB 5V to stable 12V for fan power
  • Three fan speeds plus off switch on inline controller
  • Universal 4-pin connector fits most PC and cabinet fans
  • 50 cm short cable keeps compact builds tidy
  • Durable PVC jacket with moulded housing for long life

USB 5V to 12V Step-Up Fan Cable

This cable converts a standard USB 5V port into a stable 12V supply to drive 12V cooling fans. It features a built-in boost chip and an inline controller with three speed settings plus an off switch. The 50cm length suits compact wiring inside small cases or cabinets. It connects via a universal 4-pin fan header for plug-and-play use.

DIY cooling and off-grid fan power

Ideal for builders powering case fans from power banks, laptop ports or USB chargers where no 12V header exists. The three-speed controller lets users balance airflow and noise, while the dedicated off button cuts power without unplugging. Not suited for setups requiring PWM speed signals or motherboard fan monitoring. Buyers needing longer reach should consider the 100cm variant.

50cm cable with 12V boost conversion

The integrated step-up module delivers constant 12V output from any 5V USB source, comfortably running typical 12V DC fans. The short 50cm length keeps cable clutter minimal in tight chassis or audio cabinets. Headroom depends on the USB port's current limit; high-draw fans may exceed what a standard port can supply. For extended routing across larger enclosures, the 100cm version provides extra slack.

Highlights

  • Boosts USB 5V to stable 12V for fan power
  • Three fan speeds plus off switch on inline controller
  • Universal 4-pin connector fits most PC and cabinet fans
  • 50 cm short cable keeps compact builds tidy
  • Durable PVC jacket with moulded housing for long life

Specifications

Cable Length50CM

Questions about this item

Which USB power sources can run this cable's 12 V boost converter?

Any standard USB-A port supplying 5 V — laptop, power bank, phone charger or wall adapter — feeds the built-in step-up chip that outputs a steady 12 V for the fan.

Will the 4-pin connector work with a PWM fan I already own?

Yes, the universal 4-pin male header fits mainstream PWM case and cabinet fans; the inline controller then lets you choose HIGH, MIDDLE, LOW or OFF regardless of the fan's own PWM curve.

How do I confirm the boost circuit is delivering 12 V after I plug everything in?

The fan spins at the selected speed — HIGH, MIDDLE or LOW — and stops instantly when you press the OFF button, proving the 5 V-to-12 V conversion and speed control are both active.

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