AC 220V 4000W SCR Electronic Voltage Regulator Speed Controller Control Board High Power Governor Dimmer Module Resistive Load
https://www.vogueparade.com/shopping/EN/4001/1/1005002469855834/ac-220v-4000w-scr-electronic-voltage-regulator-speed-controller-control-board-high-power-governor-dimmer-module-resistive-load//