The 175RK100 from RIR Power Electronics is a Silicon Controlled Rectifier with Breakover Voltage 1000 V, Breakover Current 3900 A, Gate Trigger Voltage 1.8 to 3.0 V, Gate Trigger Current 90 to 150 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Stud Mount. More details for 175RK100 can be seen below.