Features:1. Special design with 1.6 thick FR - 4 high temperature resistant circuit board， it is safety and reliable to cope with large current.2. Double capacity design:Safety capacitor and Metal film capacitor to protect SCR more effective and efficiency .3. 1.5 thick aluminum and stainless steel case， more suitable for family temperature control or speed control and industrial enterprises to use.4. Good quality， It will not rust after long time using.Specification:Working Voltage: AC 220VMax Power: 4000W (resistive load)Efficiency: 90%Working Voltage: AC 220VRegulation voltage: AC 10-220VDimensions: 91 x 59(do not include knob) x 34MMModule Weight: About 150gPackage included:100% Brand New1x 4000W AC220V High Power SCR Electronic Volt Regulator