The 125RK140 from RIR Power Electronics is a Silicon Controlled Rectifier with Breakover Voltage 1400 V, Breakover Current 2570 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 125RK140 can be seen below.