Specifications: Product name: 4000W AC voltage regulator Thyristor model: BTA41600B Size: length 85*width 55*height 38mm, the inner hole of the knob is 6mm. Maximum power: 4000W (resistive load limit power), the power should be reduced for a long time. The long-term resistive load is recommended to be within 2000. Efficiency: over 90% Working voltage: AC 220V Regulating voltage: AC 0-220V (from high to low can be adjusted to 0, from low to high is about 10V) Terminal 12 is connected to the input 220V, and terminal 34 is connected to the load. Package Includes: 1PC Note that the load must be connected before voltage regulation. Thyristors are mainly used for resistive loads (heating wire incandescent lamps, etc.), and most single-phase AC motors can also be used, but there is no guarantee that they can be used for other types of loads. Buyers should confirm by themselves. The fuse is not a panacea, there is a response time, if the current is too large, in addition to burning out the fuse, the module may also burn out. _x000D_ _x000D_