It is a control circuit that contains a bta41600b thyristor (scr) that you can use in the power control of your devices operating with ac voltage.

Using this circuit, you can control the brightness of your normal incandescent and halogen bulbs, adjust the power of your heaters, and control the speed of your single-phase ac motors (not all motors may operate smoothly).

Can be used with a maximum resistive load of 4000w.

Allows you to control 220vac from 10-220v.