4000W 220V AC SCR Voltage Regulator Dimmer Electric Motor Speed Controller High power: 4000W(resistive load limit power), power should be reduced for a long time, it is recommended to use it within 2000W of resistive load at room temperature (please pay attention to key parameters). The 4000W voltage regulator can be smoothly adjusted from 10V to 220V, making it more suitable for industrial enterprises that need low voltage to drive heating wires. SCR model: BTA 41600B Working voltage: AC 220V Regulation voltage: AC 10-220V Note that you must first connect the load before adjusting the voltage. SCR is mainly used for resistive loads (electric heating wire incandescent lamps, etc.). Most single-phase AC motors can also be used, but there is no guarantee that they can be used. Other types of loads should be confirmed by the buyer. Fuses are not, they have a reaction time. If the current is too large, in addition to burning the fuse, the module may also burn out. Note that the plastic cover on the joint cannot be completely opened due to the installation of the shell. The screwdriver must be twisted sideways. In addition, be careful when opening it. If you use too much force, it will easily break the cover. It is a wearing part, but it will not affect the use of the module. We will not be responsible for any plastic cover related issues.