The 400RK140S from RIR Power Electronics is a Silicon Controlled Rectifier with Breakover Voltage 1400 V, Breakover Current 9500 A, Gate Trigger Voltage 1.8 to 3.0 V, Gate Trigger Current 90 to 200 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Stud Mount. More details for 400RK140S can be seen below.