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Travis S.
Reviewed in Canada on March 12, 2025
This thing is great.. I've bought others but having the readout is super convenient for when you want to go back to that speed after you've changed it up. Also it's nice not to have to add your own cord ends
BobEaseShop
Reviewed in the United States on February 24, 2025
I have used this a few times now and like it. Makes some tools safer and I like adjusting the speed of my bench & die grinder. I made a video on YT: bobeaseshop
Steve Hiebert
Reviewed in Canada on February 13, 2025
I have a makita abrasive saw for cutting steel. I wanted to use a carbide metal saw blade but I needed to cut the speed of the motor by half or more. The SCR voltage controller did the job and saw cuts great.
Benjamin H.
Reviewed in the United States on July 31, 2024
Rated for 15 amps. Make sure it's 15a circuit or that your not pulling more than that. Overload protection failed
Customer
Reviewed in Canada on June 11, 2024
Works great for my pot still, easy to regulate power to heating element. Digital readout easy to see.
Customer
Reviewed in Canada on December 23, 2024
Picture shows the plug for a standard 15amp out let. But the product is something els I can’t use!
Harry Flouhouse sr.
Reviewed in the United States on January 20, 2024
Excellent
HalcyonDaze
Reviewed in the United States on April 2, 2024
This is built for 220V systems and does not perform for 120V, even on a purely resistive load. It cuts out below ~70% and will not provide full voltage even at it's max setting. The device does not match the description on the seller page or the manual it shipped with, which do not match each other.
james richardson
Reviewed in the United States on August 30, 2023
Well built and works great. Got this to slow a motor down and does the job just not quiet heavy enough watt wise for motor. Used it on another project and works great.
Lo so
Reviewed in the United States on August 3, 2023
Awesome Product
Susan
Reviewed in the United States on December 16, 2023
We needed this to control router speed on a router that had lost speed control. This is perfect. It works exactly how we had hoped
Burning sky forge
Reviewed in the United States on December 11, 2023
Kinda works. Kinda not awesome. Would not recommend.
Michael McCool
Reviewed in Canada on December 10, 2023
I am using this to control the speed of the fan in an air filter using a PSC AC motor. Such motors have quadratic torque but fans have quadratic drag so overall the airflow should be linear in voltage. This works ok for that purpose but there are a few caveats: 1. QA issues. My unit arrived with a random screw jammed into the outlet receptacle. It got dropped in there at some point by the manufacturer. I managed to fish it out with needlenose pliers - barely - but very annoying. Also It makes me worry about other quality issues. 2. The voltage is not linear in the dial setting. In particular, setting it to 50% only gives about 30V. Great if you want fine control over voltages at the low end, not so great if you want fine control at the high end. 3. Unit seems designed for 220V systems but works on my 120V system. But 4000W rating is probably for 220V, so scale that down to 2000W for a 120V supply. 4. Needs to have load to regulate voltage. Which probably means you should not use it for systems that need exactly a particular voltage first when turned on, e.g. electronics. This is meant for things like AC motors (at least, certain kinds that can be controlled by voltage) and resistive loads, like (small!) heaters.
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