---
product_id: 4482741
title: "PWM module for speed governor"
brand: "riorand"
price: "169 kr"
currency: DKK
in_stock: null
reviews_count: 8
url: https://www.desertcart.dk/products/4482741-pwm-module-for-speed-governor
store_origin: DK
region: Denmark
---

# High Efficiency Reverse Polarity Protection Low Heat Generation PWM module for speed governor

**Brand:** riorand
**Price:** 169 kr
**Availability:** ❌ Out of Stock

## Summary

> ⚙️ Power Your Passion with Precision!

## Quick Answers

- **What is this?** PWM module for speed governor by riorand
- **How much does it cost?** 169 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/4482741-pwm-module-for-speed-governor)

## Best For

- riorand enthusiasts

## Why This Product

- Trusted riorand brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Equipped with reverse polarity and high current protection for peace of mind.
- • **Standby Efficiency:** Static current of just 0.02A ensures energy savings when not in use.
- • **Robust Power Handling:** Effortlessly manage up to 400W of control power across a wide voltage range of 12V to 40V.
- • **Stay Cool Under Pressure:** Designed for high torque applications while generating minimal heat.
- • **Unleash Precision Control:** Experience seamless speed adjustments with a PWM duty cycle of 10% - 100%.

## Overview

The RioRand 12V-40V 10A PWM DC Motor Speed Controller is engineered for high efficiency and torque, featuring advanced technology that ensures low heat generation and robust safety measures, including reverse polarity and high current protection. With a versatile voltage range and precise control capabilities, it's the perfect solution for your motor speed management needs.

## Description

RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, High Torque, Low Heat Generating with Reverse Polarity Protection, High Current Protection

## Features

- Powered by RioRand advanced technology
- From left to right they are motor-, motor+, power-, power+
- Working voltage: dc 12V - dc 40V, control power: 0.01 - 400W
- Static Current: 0.02 A ( Standby ),PWM Duty Cycle: 10% -100%
- PWM frequency: 13 kHz

## Product Details

- **Color:** 12V-40V-10A-400W
- **Brand:** RioRand
- **Voltage:** 12 Volts
- **Material:** Metal, Plastic
- **Item Weight:** 59 Grams

## Images

![PWM module for speed governor - Image 1](https://m.media-amazon.com/images/I/718ncGYNzZL.jpg)

## Questions & Answers

**Q: is there any on/off switch in this?**
A: there is not on/off switch

**Q: I have a Battery is UB1250 12VDC 5Ah and connect to Fan that is 12DC 3.90A, 
is your item does the same application as Rheostat? if this is Not the right One?
which one you recommend please I look forward to your reply.**
A: It is similar in function to a rheostat, however, it does not waste energy by dropping the current across a resistor. This devise uses Pulse Width Modulation. If you are not familiar with this function, it basically chops the voltage in order to regulate the current output. You will be able to control the fan speed, without loosing current through a resistor in a rheostat and wasting your battery. I use it to control 12 and 24 volt wiper motors for animatronic devices. I use power supplies instead of batteries and have digital meters for output voltage, current, and motor rpm feedback by attaching a 10 tooth sprocket to the motor shaft and sensing by means of PNP proximity sensor. All of this gives me the ability to monitor and control functions of the motor quite precisely. You can also purchase versions of this controller that allow PWM control of the speed instead of the potentiometer which will then allow programmed speed patterns with a micro controller such as Arduino. This will be my next project.

**Q: Are there ports to screw the wires in or do they need to be soldered on?**
A: There are four screw ports on the side opposite the controller knob.  A pair for +/- power and another for motor.  They are clearly marked on the under side of the board.

**Q: How can I connect this to an Arduino to control a 12V motor?**
A: I did it the brute-force way.  I drilled a hole in the knob and inserted the shaft of a servo.  I then controlled the servo via the Arduino.  Not very elegant, to be sure, but nonetheless, effective.

## Customer Reviews

### ⭐⭐⭐⭐⭐ I used two of these as a means to control the blowers on my fog setup last Halloween.
*by B***E on March 17, 2025*

I used two of these as a means to control the blowers on my fog setup last Halloween. They did a fantastic job of regulating the blower speed. I mounted them inside a wather tight box for protection. Conection were super easy and they worked flawlesly.

### ⭐⭐⭐⭐⭐ Works great.  gives smooth speed control of DC motor.
*by K***C on September 28, 2014*

Nothing wrong with this! Its a PWM speed controller so it enables you to control the speed of these little DC gear motors smoothly. I used one on a DIY motorized camera slider/dolly to get the slider moving at the exact right speed and another on a turntable - both worked great.If you want a small 12v motor with speed control then this takes care of the speed control part. The motors I used with it are both the "HOSSEN® 30RPM Mini Gear Box Electric Motor 12V DC 37MM High Torque", and the "RioRand® DC 12V 0.07A 3.5RPM High Torque Gear Box Electric Motor 37mm". Both of these motors are on Amazon as well, so for the price I think its a good deal to get something motorized. They both ship from the USA and arrived fast, so just watch out for the ones that ship from "overseas" that take weeks to arrive - if you are concerned about getting it soon.There's no instructions with it, but there are 4 screw terminals to attach the wires - 2 for the power supply and 2 go to the motor, and once you connect them you have speed control of the motor. One thing worth noting - the screw terminals are not clearly marked when you are looking at it from the angle shown in the image above, but if you see where the screw terminals are and then turn the board upside down you will see it is written on the reverse side under each terminal. If you are going to screw it down before you attach wires its worth writing down which wire goes where as you won't be able to see it once the board is screwed down!Summary, good product for the price.

### ⭐⭐⭐⭐ Had to figure out a way to mount this
*by W***Z on March 22, 2024*

Works well to turn down the 12 volt fans on our fireplace, which crank out great volumes of hot air, but are pretty loud, so I added this to be able to turn them down when the fire's not real hot. Only challenge was figuring out a way to mount this device in an electrical box. It would have been nice if it came with a simple cover to protect the electronics.

## Frequently Bought Together

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-20*