The VS-T90RIA from Vishay is a Silicon Controlled Rectifier with Breakover Voltage 100 to 1200 V, Breakover Current 90 A, Gate Trigger Voltage 2.5 V, Gate Trigger Current 0.12 A, Temperature Operating Range -40 to 125 Degree C. Tags: Chassis Mount. More details for VS-T90RIA can be seen below.