4000W Adjustable AC Speed Controller

Rated for 100–120V AC input; supports up to 4000W resistive load (e.g., incandescent lamps, heating elements) and 1500W inductive load (e.g., universal motors in angle grinders, blowers, exhaust fans); maximum current capacity 15A, rated continuous current 9A. Housing made from high-temperature flame-retardant material — resists deformation and maintains structural integrity under sustained thermal stress. Features precision single-turn pressure-regulating knob for smooth, stable, repeatable speed adjustment. Equipped with independent input/output switch control and built-in overload protection. Compatible with standard North American Type A and Type B plugs. Designed for direct plug-in use — no wiring or installation required. Not suitable for devices containing internal circuit boards, capacitors or sensitive electronics (e.g., LED drivers, variable-frequency drives, modern power tools with electronic speed control). Ideal for angle grinders, marble cutting machines, electric furnaces, tungsten-filament bulbs, blowers and exhaust fans.