The 5STP 45Y8500 is an 8.5kV Thyristor hockey-puck type manufactured by ABB. It has an Ifmax, or maximum forward current, of 6.99kA, a 4.45kA Igt, or gate trigger current, and a 400mA Igt. This part is suitable for high power applications such as AC drives, motor control, HVDC conversion, and welding power supplies.