--- product_id: 42937479 title: "7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green" brand: "riorand" price: "115.91 DT" currency: TND in_stock: true category: "Rio Rand" url: https://www.desertcart.tn/products/42937479-7-70v-pwm-dc-motor-speed-controller-30a-low-heat store_origin: TN region: Tunisia --- # 7-70V wide voltage range 30A high current capacity Extra fuse for safety backup 7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green **Brand:** riorand **Price:** 115.91 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Master your motor’s speed with power, precision, and peace of mind! ## Quick Answers - **What is this?** 7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green by riorand - **How much does it cost?** 115.91 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/42937479-7-70v-pwm-dc-motor-speed-controller-30a-low-heat) ## 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, Always:** Includes a spare fuse and passive overcurrent protection for worry-free DIY innovation. - • **Plug & Play Simplicity:** Easy wiring with onboard run/stop/brake switch and detachable potentiometer for instant control. - • **Built to Last, Designed to Cool:** Low heat aluminum housing with high-voltage MOSFETs ensures durability and quiet operation. - • **Versatile Voltage Compatibility:** Operates seamlessly from 7V up to 70V, perfect for a wide range of brushed DC motors and small devices. - • **Power Your Projects with Precision:** Supports 1%-100% duty cycle at 12kHz PWM for smooth, customizable motor control. ## Overview The RioRand 7-70V PWM DC Motor Speed Controller delivers up to 30A current with a wide voltage range, optimized for brushed DC motors. Its low-heat aluminum housing and built-in safety features, including an extra fuse, make it ideal for DIY projects, robotics, and small electric devices. With smooth speed transitions and easy wiring, it’s a reliable choice for professionals and hobbyists seeking precise motor control. ## Description RioRand 7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green - desertcart.com ## Features - 7-70V Wide Voltage & 30A High Current – For brushed DC motors only (not brushless/AC power). Supports 1%-100% duty cycle (12kHz PWM) & 500W max output. Power limits: 12V≤250W, 24V≤350W, 48V≤450W, 60V≤400W. Reserve 5-10V margin (do not overload). - Low Heat & Durable Design – Equipped with high-voltage MOSFET, 3x 100V capacitors & aluminum housing. Low heat generation, easy component replacement, no vibration/noise – reliable for long-term use. Extra fuse included for backup. - Accurate Voltage Measurement Tip – Output voltage must be measured with a loaded motor (no-load readings = input voltage, which is normal). Suitable for DIY robotics, small tools, fans, mini pumps & hobby projects. - Easy Wiring & Safe Operation – Input DC polarity must match (reverse = damage); motor output no polarity (swap wires for direction). On-board run/stop/brake switch + detachable 15cm potentiometer wire. - Trusted Performance & Upgraded Design – Smooth speed transitions, built-in spare fuse delivers passive overcurrent safeguard & stable operation. Modified to address common use issues –Suitable for hobbyists & DIY enthusiasts. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B071NQ5G71 | | Best Sellers Rank | #23,206 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Electrical Motor Controls | | Brand Name | RioRand | | Color | Green | | Customer Reviews | 4.2 4.2 out of 5 stars (5,070) | | Included Components | NO | | Item Type Name | Motor Speed Controller Switch 30A | | Item Weight | 0.28 Pounds | | Manufacturer | RioRand | | Material Type | Iron | | Model | 7-70V PWM DC | | Part Number | RR-MJLK-FBDG | | UPC | 637012215377 | | Unit Count | 1.0 Count | | Warranty Description | 3 months | ## Product Details - **Brand:** RioRand - **Color:** Green - **Item Weight:** 0.28 Pounds - **Material:** Iron - **UPC:** 637012215377 ## Images ![7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green - Image 1](https://m.media-amazon.com/images/I/71tU-B63OCL.jpg) ## Available Options This product comes in different **Set** options. ## Questions & Answers **Q: What does p and m mean? If Have 3 dc fans wired in parallel, which ports would be appropriate to install the wires into. And where to install power?** A: Pwm stands for pulse width modulation. It's a way to take the available power from the battery and mange the power delivery to the device. Instead of the battery discharging at 100% rate, the power is being sent out in on/off pulses. This reduces the battery drain. The frequency of the pulses is selected by the user when turning the control knob. Some devices will work well with this (dc electric motors with this unit) and others may not. The benefits of this are: (1) Battery efficiency - This scheme is commonly used for motors powered by batteries to achieve significant improvements in battery life. I use mine (50 amp version) to run my older trolling motor. My batteries can last even double the amount of time by dialing back the knob so that I'm sending out a smaller percentage of the power than 100%. So, for example, if I chose to have the control set to 40% of max I would achieve a significant improvement in battery life. This also means that the motor would run slower. There is a trade off in performance, but it heavily favors battery efficiency. The way I use it, is with a voltage meter readout to observe it's performance. I've been able to deduce that the most efficient gear to use on my trolling motor is the fastest gear. Once I know that, I turn the dial to achieve the speed I want to go instead of achieving the same speed in a less efficient gear. I watch the battery meter to observe how fast the battery draw down is happening over time and choose a top speed that I'm willing to live with as a trade off of power versus battery life. Why this works is because batteries are most efficient when the discharge rate is the slowest. If I'm maxing the battery discharge rate, I'm reducing the battery run time. There is a sweet spot where the battery is happy and the speed is acceptable. (2) Infinite variable speed. This offers variable speed to a motor that only has one speed or several geared speeds. If you couldn't quite hit the right trolling speed in a fixed gear, you can nail the speed with this variable speed control. (3) Some units also have polarity reversal, which means that I can flip that switch and the motor will go in reverse. If a person fashioned a remote steering system for the trolling motor, the trolling motor tiller handle wouldn't have to be touched. It could operate remotely from another location in the boat. Some newer motors have this feature built in, so this device wouldn't have any benefit. A different application would be to have a 12 volt power supply and a 12 volt motor (old treadmills can sometimes have the motors). Hook up the 12 volt motor to a drill press, lathe, bandsaw, etc. and the device would now achieve variable speed. This is really useful for these tools. In the case of a bandsaw, a typical woodworking bandsaw witht the right blade can run slow enough to cut metal. The simpler way to have this effect for those tools would be to get an AC version of the pwm. This would still work, but would be more ideal for someone willing to retrofit the tool. It would be good for alternative energy users (solar, wind, battery banks). **Q: How many wires come from the potentionmeter and can you add on to them?** A: 3 wires. tiny voltage divider... this is all based on a 555 circuit driving 3 mosfets in parallel. **Q: Will this work with 2 power wheel motors?** A: As long as the power wheels motors are within its voltage range, yes. Just be careful not to feed them more voltage than they are rated for, or use a power supply whose voltage is matched to the spec of the motors **Q: ¿nesecito para regular pulidoras cual es recomendable?** A: Este aparato es muy servisial y creo que si lo puedes usar en las pulidora rregula la belosidad ## Frequently Bought Together - RioRand 7-70V PWM DC Motor Speed Controller Switch 30A - Digital Low Voltage Protector Disconnect Switch Cut Off 12V Over-Discharge Protection Module for 12-36V Lead Acid Lithium Battery Low Voltage Cutoff for Solar Panel Lighting System Camper - for Power Wheel Adapter Compatible with Dewalt 20V Battery Converter Kit with Switch & Fuse & Wire Terminals & 12 AWG Wire for DIY RC Car Toys Robotics --- ## 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.tn/products/42937479-7-70v-pwm-dc-motor-speed-controller-30a-low-heat](https://www.desertcart.tn/products/42937479-7-70v-pwm-dc-motor-speed-controller-30a-low-heat) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-24*