ITEM NAME:AC 220V 5000W SCR Voltage Regulator Lamp Dimming Speed Controller Thermostat Description: Working voltage: AC 220V ; Regulating voltage: AC 0-220V (From high to low you can to 0, from low to high you can from 20V.) Maximum power: 5000W (impedance load limit power), when used for a long time, should reduce the power, suggest using impedance load 2500W. Effective rate: more than 90% Adjustable Voltage: Close to 0V-220V AC Application: Lamp dimmer, Motor speed control, Thermostat All-aluminum heat dissipation shell 30A high-current terminal Package Includes: 1 Piece SCR Voltage Regulator Note: Note that the load must be connected before the voltage is adjusted..All-aluminum heat dissipation shell.