AC Variable Speed Controller, 120V~220V 15A 4000W SCR Voltage Controller for Router Fan Electric Motor Rheostat

I have two Westinghouse table fans from the 1950s. They move a lot of air but they tend to be a bit noisy. When I want a lot of moving air or I want white noise for a sleep, those fans are great. For TV I want much less airflow and much less noise. This controller works perfectly to slow the fan, reduce the air and cut the noise dramatically. I can use the ON/OFF switch without changing the speed setting and the fan returns to the preset speed from the night before. That's just what I wanted. The watt meter on the controller does not show what wattage of this fan. I don't know why and I really don't care. The controller does what I want it to do.

I had some issues getting this working, the way I wanted it to. But working with the manufacturer I was satisfied with the solutions they provided.

This AC Variable Speed Controller delivered exactly one thing reliably: failure at the most inconvenient possible moment. The on/off switch lasted just long enough to outlive the return window, then immediately gave up. No warning, no gradual decline—just a clean, decisive break the very next day. You almost have to respect that level of precision. If there isn’t a built-in expiration timer, it’s doing an excellent impression of one. While it technically worked for a short period, that now feels more like a trial run than actual ownership. At this point, calling it a “controller” seems optimistic—it’s more of a temporary suggestion. Buy it if you enjoy perfectly timed disappointment and the strong suspicion you’ve been outplayed by a piece of hardware.

Got this and was surprised at how lightweight it is. Weight-wise, it feels like the controller is empty, and feels like it was made very cheaply. Was skeptical, but plugged it in to run a large shop fan. This fan has 2 speeds - tropical force and hurricane force winds! Works well for outside and a large shop, but we wanted to use it indoors when doing repairs around the house as well. Hooked this controller up, and it definitely slows the fan speed down. The fan doesn't even start to work until the dial on the controller is at about 60% (less than that the fan does nothing), and goes up from there. When using the controller the fan speed never gets to full speed, even at 100%. Not a problem because if we want the fan to run at full speed, we just unplug the controller, and use the fan as-is. We wish the speed control was better at controlling the fan between 0-100%, but at least it does make the fan usable indoors, whereas it wasn't before. With the build quality, I'm not really sure how long it will last, but time will tell.

We purchased this AC variable speed controller for use with a motor that powers our waterfall, and it works exceptionally well! The controller allows for smooth and precise adjustments, providing great flexibility to control the water flow exactly as we want. The performance has been consistent, and it's made a noticeable difference in the operation of our waterfall. One thing to note, however, is that the unit is not waterproof. While this is not a dealbreaker for us, having a waterproof option would be a fantastic addition for outdoor or high-moisture settings. Overall, we're very pleased with the functionality and reliability of this product. Highly recommended for those needing motor speed control!