The FS0403DD00TR from Fagor Electronica is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 30 to 33 A, Gate Trigger Voltage 0.8 V, Gate Trigger Current 20 to 200 uA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for FS0403DD00TR can be seen below.