The C147EHR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 500 V, Breakover Current 910 to 1000 A, Gate Trigger Voltage 0.25 to 3.5 V, Gate Trigger Current 150 to 300 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Stud Mount. More details for C147EHR can be seen below.