DROK V 3800W High Power Regulator SCR Adjustable Controller Dimmers Speed Controller Thermostat Working Voltage: AC 220V; Maximum Power: 3800W; Voltage Regulation: AC 0-220V Use STMicroelectronics SCR, can dim, adjust speed, voltage, temperature high efficiency The SCR is two - way and large power, potentiometers are with nuts, easy to use The regulator has Peak voltage absorption circuit to protect SCR, long performance life Application Electric furnace, water heater, lamps, small motor, electric iron etc