--- product_id: 4482741 title: "RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, ..." brand: "riorand" price: "£13.28" currency: GBP in_stock: true category: "Rio Rand" url: https://www.desertcart.co.uk/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob store_origin: GB region: United Kingdom --- # 12V-40V wide voltage range 10A max current with reverse polarity protection 13kHz PWM for ultra-quiet speed control RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, ... **Brand:** riorand **Price:** £13.28 **Availability:** ✅ In Stock ## Summary > ⚙️ Control Your Motor, Command Your Craft – Quiet, Safe, and Effortless! ## Quick Answers - **What is this?** RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, ... by riorand - **How much does it cost?** £13.28 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/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 - • **Plug & Play Simplicity:** Clearly labeled terminals and intuitive knob control make installation and operation effortless. - • **Versatile DIY Essential:** Compact, rugged design perfect for RVs, garage projects, pumps, fans, and robotics—upgrade your gear now. - • **Smooth & Silent Speed Adjustment:** Linear 10%-100% speed control at 13kHz frequency eliminates noise and jerky starts. - • **Built-In Safety for Peace of Mind:** Reverse polarity and overcurrent protection plus a replaceable 10A fuse safeguard your investment. - • **Power Your Projects with Precision:** Supports up to 400W for versatile DC brushed motor control across 12V to 40V systems. ## Overview The RioRand 12V-40V 10A PWM DC Brushed Motor Speed Controller is a robust, user-friendly module designed for precise speed regulation of brushed DC motors up to 400W. Featuring advanced safety protections including reverse polarity and overcurrent safeguards, it ensures reliable, quiet operation with a high-frequency 13kHz PWM signal. Ideal for DIY enthusiasts and professionals working on fans, pumps, RV ventilation, and garage projects, this compact controller offers seamless installation and durable performance. ## 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 | #53,487 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 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 | | Number of Items | 1 | | Number of Packs | 1 | | 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 ![RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, ... - 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.co.uk/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob](https://www.desertcart.co.uk/products/4482741-riorand-12v-40v-10a-pwm-dc-motor-speed-controller-knob) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-08-27*