High-power rectifier assemblies in rolling mills and continuous casting lines rely on this thyristor to switch and regulate the massive DC currents that drive the main motors. Inside the drive cabinet, the device sits between the AC supply and the motor armature, converting incoming three-phase power into precisely controlled DC output. Operators adjust speed and torque by varying the thyristor’s firing angle, allowing the mill to accelerate smoothly from standstill to full production speed or to hold exact tension on the strip during coiling. When the line reverses direction, the symmetrical design ensures the same switching performance in both forward and reverse bias, eliminating the need for separate components and simplifying the drive’s control logic. In paper mills, the same thyristor controls the large DC motors that pull the web through the drying section, maintaining constant speed despite variations in moisture content and roll diameter. The part’s ability to block voltage in both directions also protects the drive against regenerative energy spikes when the motor decelerates, preventing over-voltage damage to the power electronics.