The 5SGA20H2501 from ABB is a Gate Turn off Thyristor with Breakover Voltage 2500 V, Breakover Current 2000 A, Gate Trigger Voltage 1 V, Gate Trigger Current 2.5 A, Temperature Operating Range -40 to 125 Degree C. Tags: Disc. More details for 5SGA20H2501 can be seen below.