Perfect for bench testing, experiments, and industrial applications, this variable speed motor controller provides precise control of fan speed and voltage regulation. The maximum power of this voltage regulator is 4000W, AC 120-220V input, adjustable voltage output (0-220V), rated current is 9A, and can withstand a maximum current of 18A. This motor speed controller is equipped with a bidirectional high-power SCR inside. You can easily control the motor speed to the desired level using a rheostat. [Powerful Functions]Powerful 4000-watt AC motor speed regulator with variable thyristor and electronic voltage regulator. Equipped with a universal socket and power light, and equipped with heat dissipation connectors for quick heat dissipation. [High Quality]Using a metal shell structure, it is high temperature resistant, flame retardant and not easy to rust. The core chip uses high-power thyristors. With adjustable button, stepless voltage adjustment can be achieved. NOTE: The maximum power limit is 1500W for inductive loads (fans, routers, soldering irons, small motors) and 4000W for resistive loads (kettles, stoves, tungsten lights, etc.). Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, the United States, the Philippines, Taiwan and so on. voltage: AC220V Material: ABS colour: As Shown Package Contents: 1 x controller