does support a small water pump? I already have a similar one in my water pump, but this one,in the description says it doesn't support it, why?

You have to start the motor at 100% and then back it down to the desired RPM. I am running a one horsepower buffer on mine and you can definitely tell when you put too much pressure on it that the motor wants to stall. I would think a water pump would take a lot of amps and not like being slowed down.

so i could use this to control the speed on a bench sander / grinder or a bandsaw?

I don't think so...I will control things like a shop vac or router...something this is a DC motor that is supplied with AC...

I have an angle grinder, will this work with it? Thanks

Yes, the voltage of the angle grinder can be adjusted If you have any questions, please contact our email: Bosun128888@outlook.com

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⚙️ Master your motor speed with industrial-grade precision and power!

SAFETY FIRST - Zero hysteresis & peak absorption circuit protect against spikes and overheating—work worry-free.
BUILT TO LAST - Premium SMD thyristors and FR-4 heat-resistant circuit boards ensure long-term reliability.
POWERHOUSE PERFORMANCE - Handles up to 4000W resistive load & 15A current for serious industrial-grade control.
VERSATILE COMPATIBILITY - Perfect for fans, routers, heaters, and motors—ideal for hands-on pros, not smart appliances.
PRECISION VOLTAGE CONTROL - Smoothly adjusts output voltage from 0 to 220V, giving you exact motor speed tuning.

This AC Variable Speed Controller supports 120V/220V input with a max current of 15A and output power up to 4000W resistive load. Featuring high-quality SMD thyristors, an all-aluminum heat sink, and advanced safety circuits, it delivers precise voltage control (0-220V) for fans, routers, heaters, and small motors. Designed for durability and reliability, it’s a must-have for professionals seeking robust, adjustable motor speed control in industrial and workshop settings.

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Item Weight	490 g
Manufacturer	SDRGEEK
Color	Black
Shipping Weight	0.52 Kilograms
Item Model Number	SD-4000W-01
Item Part Number	SD-4000W-01
Primary material	Metal
What is in the box?	1 x Fan Speed Controller
Country of Origin	China

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

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