Amp -Silicon Controlled Rectifier Highlights Generic Brand Silicon Controlled Rectifier Description: 1 piece AC 220V 4000W SCR Voltage Regulator Motor Speed Controller Dimming Modulation Note that the load must be connected before voltage regulation . High quality materials, imported SCR; Special design with 1.6 thick FR - 4 thick circuit board. It is safe and reliable to deal with large current. 1.5 thickness aluminum and stainless steel housing, more suitable for family temperature control or speed control and industrial enterprises to use. It will not rust after a long time of use. If you use it for a long time, pls reduce the power to use. It is recommended to use the resistive load at room temperature within 2000W specification: Dimensions: 85x 55x38mm / 3.35x2.17x 1.50 (LxWxH), button hole 6mm. Maximum power: 4000W (resistive load limit power), power should be reduced for a long time. Validity: more than 90% Working voltage: AC 220V Regulation voltage: AC 10-220V. Package includes: 1 Piece Electronic Voltage Regulator Note: For the first time, adjust the potentiometer counterclockwise at the bottom before powering it on. If not, connected with low resistance value heating wire and other load, energize immediately and easily.