PWM DC Fan & Motor Speed Controller 4.5–24V 2A with Switch

PWM DC Motor & Fan Speed Controller — DC 4.5–24V, 2A, 5.5×2.1mm Plug

Take precise control of your DC motors, cooling fans, and LED lighting with this compact PWM Speed Controller. Featuring a wide operating voltage range of DC 4.5V to 24V and a smooth 1%–100% adjustable duty cycle, this versatile module delivers reliable, stepless speed regulation for DIY electronics, cooling systems, robotics, and more. Made in Mainland China.

Key Features

• Wide Voltage Compatibility: Operates stably between DC 4.5V and 24V (input range 3V–28V), making it compatible with a broad range of DC power sources and applications.
• Smooth PWM Control: 22K PWM square wave signal with 1%–100% adjustable duty cycle for precise, stepless speed adjustment of motors or LED dimming.
• Built-In Power Switch: The speed control knob doubles as a power switch — turn it to the minimum position until you hear a "click" to cut power completely to both the controller and the connected motor. Supports up to 3A switch current.
• Self-Recovery Fuse Protection: Integrated 2A PPTC-R self-recovery fuse on the power input automatically limits current during overload, then restores power supply once the fault is cleared — no fuse replacement needed.
• Intuitive Green Indicator Light: The brightness of the green LED indicator adjusts in real time with your speed setting, giving you an instant visual reference of the current output level.
• 5.5×2.1mm Male-Female Barrel Connectors: Standard DC barrel plug-and-socket connectors for easy, tool-free installation into existing setups.
• Dual-Wire (Double-Wire) Design: Simple two-wire connection keeps wiring tidy and installation straightforward.
• Compact & Durable PC Housing: Lightweight polycarbonate enclosure that stands up to everyday workshop and project use.

Technical Specifications

What's in the Box?

• 1× PWM Motor / Fan Speed Controller with Double-Wire Switch

Please Note

• Colors may vary slightly from images due to monitor settings and lighting conditions.
• Please allow ±1–10mm variance due to manual measurement.

Learn More About Electrical Safety

For guidance on safe DIY electrical practices and component handling, visit CPSC Electrical Safety.

Frequently Asked Questions

Q: Can this PWM speed controller be used to dim LED lights as well as control motor speed?

A: Yes! This PWM controller works for both DC motor speed regulation and LED dimming. The adjustable duty cycle (1%–100%) allows you to smoothly control the brightness of LEDs or the speed of DC fans and motors within the DC 4.5–24V operating range.

Q: What does the self-recovery fuse (PPTC-R) do, and do I need to replace it after an overload?

A: The built-in 2A PPTC-R self-recovery fuse automatically transitions to a high-resistance state if the output is overloaded, effectively cutting current to protect your connected device. Once the overload fault is removed and the fuse cools, it automatically resets and restores normal operation — no replacement is required.

Q: How does the built-in power switch work?

A: The speed control knob integrates a power switch. Simply turn the knob down to its minimum position until you hear an audible "click." At this point, the input power is fully disconnected and neither the controller nor the motor receives any power (0 mA static current in the off state). Turn the knob clockwise past the click to restore power and begin speed adjustment.

Q: Is this controller compatible with 12V PC cooling fans?

A: Yes, this controller is well-suited for 12V DC cooling fans. At 12V it supports up to 24W (2A), which covers the vast majority of standard PC and case cooling fans. Simply connect your fan's DC barrel connector to the female plug on the output side.