Feature: 1. WIDE APPLICATION: The voltage regulator is widely used for electric furnace, incandescent lamp, baking lamp, PTC heating plate, electric soldering iron, etc. Most motors with one capacitor can be used. 2. SAFE TO USE: The speed regulator with fuse and housing is safer and more convenient to install, and is more suitable for families and factories and enterprises that are not convenient to install. 3. LARGE CURRENT SAFE: 41A silicon controlled rectifier and high temperature resistant circuit board are used. The circuit design of motor voltage regulator is reasonable, and the thickened welding circuit design is adopted. Even if the high current passes, the regulator is enough to deal with it, and the use is safer and more reliable. 4. RUST RESISTANT: 1.5 thick aluminum plate and stainless steel are used for external molding, which is beautiful, safe, convenient, and rust resistant, ensures a long life span. 5. IDEAL REPLACEMENT: This voltage regulator is an ideal replacement for the old and damaged parts for better regulating performance. Specification: Item Type: Motor Speed Regulator Application: Voltage regulator Product Size: Approx. 8.5 x 5.5 x 3.5cm / 3.3 x 2.2 x 1.4in; Knob inner hole Approx. 6mm / 0.24in Material: ABS, Aluminum, Stainless Steel, 41A Thyristor, FR 4 High Temperature Resistant Circuit Board Maximum Power: 4000W (limiting power of resistive load), the power should be reduced for a long time, and the resistance load for a long time is recommended to be within 2000 Efficiency: More than 90% Working Voltage: AC 220V Regulated Voltage: AC 10-220V Fuse: 5 x 20 20A Speed Regulation Mode: Manual speed regulation. Package List: 1 x Motor Speed Regulator Note: The load must be connected first and then the voltage must be adjusted. Before the first use of power on, the potentiometer should be adjusted to the end anticlockwise. Otherwise, the load such as the electric wire with small resistance value will be easily burned up at the moment of power on.