---
product_id: 4482741
title: "12V-40V 10A PWM DC Brushed Motor Speed Controller, Linear Governor Module with Reverse Polarity & Over Current Protection for DIY Fans, Pumps, RV and Garage Projects"
brand: "riorand"
price: "Bs.386"
currency: BOB
in_stock: true
category: "Rio Rand"
url: https://www.desertcart.bo/products/4482741-12v-40v-10a-pwm-dc-brushed-motor-speed-controller-linear
store_origin: BO
region: Bolivia
---

# 8A continuous current, 10A max 13kHz PWM for ultra-quiet operation Built-in reverse polarity & overcurrent protection 12V-40V 10A PWM DC Brushed Motor Speed Controller, Linear Governor Module with Reverse Polarity & Over Current Protection for DIY Fans, Pumps, RV and Garage Projects

**Brand:** riorand
**Price:** Bs.386
**Availability:** ✅ In Stock

## Summary

> ⚙️ Master your motor’s speed with silent precision and bulletproof safety!

## Quick Answers

- **What is this?** 12V-40V 10A PWM DC Brushed Motor Speed Controller, Linear Governor Module with Reverse Polarity & Over Current Protection for DIY Fans, Pumps, RV and Garage Projects by riorand
- **How much does it cost?** Bs.386 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/4482741-12v-40v-10a-pwm-dc-brushed-motor-speed-controller-linear)

## 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

- • **Compact Versatility:** Robust yet compact, ideal for garage, RV, marine, robotics, and home repair applications—upgrade your gear with confidence.
- • **Safety-First Design:** Integrated reverse polarity protection, overcurrent safeguard, and replaceable 10A fuse keep your projects safe and reliable.
- • **Plug & Play Simplicity:** Clearly labeled terminals and intuitive knob control make installation effortless—no technical headaches required.
- • **Whisper-Quiet Precision:** Smooth linear speed adjustment from 10% to 100% with 13kHz frequency ensures noise-free, jump-free motor control.
- • **Powerhouse Compatibility:** Seamlessly controls 12V to 40V DC brushed motors up to 400W, perfect for versatile DIY and industrial projects.

## Overview

The RioRand PWM Speed Governor is a professional-grade DC brushed motor controller supporting 12V to 40V inputs with up to 10A peak current and 400W power. It delivers smooth, noise-free speed control via 13kHz PWM frequency, featuring built-in reverse polarity and overcurrent protection alongside a replaceable fuse. Designed for easy installation with labeled terminals and a simple knob, it’s perfect for DIY enthusiasts and light industrial use across diverse applications like fans, pumps, and garage projects.

## Description

RioRand 12V-40V 10A PWM DC Brushed Motor Speed Controller, Linear Governor Module with Reverse Polarity & Over Current Protection for DIY Fans, Pumps, RV and Garage Projects: Electric Motor Controls: desertcart.com: Industrial & Scientific

## Features

- Professional PWM Governor for DC Brushed Motors：Powerful PWM speed control module compatible with 12V, 24V, 36V and 40V DC brushed motors. Rated 8A with 10A max support and up to 400W power capacity. NOT compatible with brushless or three-phase motors to avoid misapplication and damage.
- Smooth Linear Speed Control & Low-Noise Operation：Delivers reliable 10%–100% adjustable speed with 13kHz frequency for quiet performance. Ideal for DIY cooling fans, water pumps, small tools and garage projects, eliminating jumpy or full-speed-only operation.
- Enhanced Safety Features for Long-Lasting Use：Built-in reverse polarity protection, over current protection and a 10A replaceable fuse. Low-heat design with aluminum heat sink reduces burnout risks, ensuring stable performance for heavy-duty DIY and light industrial use.
- Clear Wiring & User-Friendly Installation：Labeled terminals (Motor-, Motor+, Power-, Power+) prevent wiring errors. Simple knob control requires no complex setup, making it perfect for hobbyists, students, and home repair replacements.
- Versatile for Garage, RV, Marine & DIY Projects：Compact and sturdy structure fits a wide range of applications including RV ventilation, water pump control, small equipment repair, robotics, and garage builds. A cost-effective replacement for old or broken speed controls.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007TH4EN6 |
| Best Sellers Rank | #56,708 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #29 in Motor Speed Controllers |
| Brand Name | RioRand |
| Color | 12V-40V-10A-400W |
| Customer Reviews | 4.1 4.1 out of 5 stars (599) |
| Display Type | PWM DC motor speed controller |
| Global Trade Identification Number | 00645195917568 |
| Item Weight | 2.08 ounces |
| Manufacturer | RioRand |
| Material Type | Plastic |
| Model | RRPDMSCSGSPC |
| Part Number | RRPDMSCSGSPC |
| UPC | 645195917568 619636102455 |
| Unit Count | 1 Count |
| Voltage | 12 volts_of_direct_current |
| Warranty Description | 3 months |

## Product Details

- **Brand:** RioRand
- **Color:** 12V-40V-10A-400W
- **Item Weight:** 2.08 ounces
- **Material:** Plastic
- **Voltage:** 12 volts_of_direct_current

## Images

![12V-40V 10A PWM DC Brushed Motor Speed Controller, Linear Governor Module with Reverse Polarity & Over Current Protection for DIY Fans, Pumps, RV and Garage Projects - Image 1](https://m.media-amazon.com/images/I/71YDylKM9sL.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

- 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
- BEMONOC Garage Door Motor 12V DC Right Angle Reversible Electric Gear Motor 45 RPM High Torque
- ALITOVE DC 12V 5A Power Supply Adapter Converter Transformer AC 100-240V Input with 5.5x2.5mm DC Output Jack for 5050 3528 LED Strip Module Light

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

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

---

*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-07-26*