---
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: "Bs.245"
currency: BOB
in_stock: true
url: https://www.desertcart.bo/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob
store_origin: BO
region: Bolivia
---

# High Efficiency Reverse Polarity Protection Low Heat Generation 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:** Bs.245
**Availability:** ✅ In Stock

## Summary

> ⚙️ Power Your Passion with Precision!

## 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?** Bs.245 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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

- • **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

![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)

## 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.

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.bo/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob](https://www.desertcart.bo/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-01-22*