---
product_id: 4482741
title: "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"
brand: "riorand"
price: "₨8191"
currency: LKR
in_stock: true
reviews_count: 13
category: "Rio Rand"
url: https://www.desertcart.lk/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob
store_origin: LK
region: Sri Lanka
---

# 12V-40V wide voltage range 10A high current with reverse polarity protection 13kHz PWM frequency for smooth speed control 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

**Brand:** riorand
**Price:** ₨8191
**Availability:** ✅ In Stock

## Summary

> 🎛️ Master your motor’s pace with RioRand’s smooth, safe, and powerful control!

## Quick Answers

- **What is this?** 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 by riorand
- **How much does it cost?** ₨8191 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob)

## 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

- • **Precision Speed Control:** Effortlessly dial in motor speed with a tactile knob for seamless adjustments.
- • **Compact & Versatile Design:** Small footprint (73x60x27mm) fits neatly into any DIY or professional motorized system.
- • **Cool & Efficient Performance:** High torque output with minimal heat generation keeps your projects running longer.
- • **Robust Voltage Compatibility:** Operates flawlessly across 12V to 40V DC, perfect for diverse motor setups.
- • **Advanced Protection Circuitry:** Built-in reverse polarity and high current safeguards ensure durability and safety.

## Overview

The RioRand 12V-40V 10A PWM DC Motor Speed Controller offers precise, high-efficiency speed regulation for DC motors. Featuring a wide voltage range, 13kHz PWM frequency for smooth operation, and built-in protections against reverse polarity and high current, it ensures reliable and safe motor control. Its compact design and tactile knob make it ideal for professional and DIY applications requiring fine-tuned motor speed adjustments.

## Description

RioRand 12V-40V 10A PWM DC Motor Speed Controller w/ Knob--High Efficiency, High Torque, Low Heat Generating with Reverse Polarity Protection, High Current Protection From left to right they are Motor-, Motor+, Power-, Power+ Features: Control the speed of a DC motor with this controller High efficiency, high torque, low heat generating With reverse polarity protection, high current protection Size (L x W x H ): Approx. 73 x 60 x 27 mm Material: Plastic, metal Package Including: 1 x RioRand Speed Controller

Review: Works great. gives smooth speed control of DC motor. - 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 desertcart 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.
Review: Works well! - Works well to adjust speed of my harbor freight rotary tool! 3D printed a case I found on thingiverse! The only noise is from the fan I mounted on top of the case but that’s from the vibrations of the fan. I added felt pads to the bottom of the case to help with that!

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007TH4EN6 |
| Best Sellers Rank | #77,413 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #46 in Motor Speed Controllers |
| Date First Available | August 9, 2012 |
| Display Type | LED |
| Global Trade Identification Number | 00645195917568 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.08 ounces |
| Item model number | RRPDMSCSGSPC |
| Manufacturer | RioRand |
| Product Dimensions | 2.36 x 1.97 x 1.18 inches |
| UPC | 645195917568 619636102455 |

## Product Details

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

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/718ncGYNzZL.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71tYD49UzFL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71EN2Csq45L.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71geZBc9tbL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/618ivwE7+pL.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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Works well!
*by T***S on November 22, 2025*

Works well to adjust speed of my harbor freight rotary tool! 3D printed a case I found on thingiverse! The only noise is from the fan I mounted on top of the case but that’s from the vibrations of the fan. I added felt pads to the bottom of the case to help with that!

### ⭐⭐⭐⭐ Potentiometer was dirty.
*by R***S on March 15, 2024*

Tested a small motor with no load. Throughout the rotation of the pot, motor stalls and jumps in speed. Apparently the potentiometer is dirty and needs cleaning. After the pot is cleaned and the device was tested with numerous motors both brushed and brushless. This device is as good as rated, though efficiency could be better.

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-27*