The MS T174S10UB from MS Power is a Silicon Controlled Rectifier with Breakover Voltage 1000 V, Breakover Current 4000 to 5000 A, Gate Trigger Voltage 3.0 V, Gate Trigger Current 200 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Stud Mount. More details for MS T174S10UB can be seen below.