The FS0203MA00BU from Fagor Electronica is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 22.5 to 25 A, Gate Trigger Voltage 0.8 V, Gate Trigger Current 20 to 200 uA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for FS0203MA00BU can be seen below.