The C233EHR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 500 V, Breakover Current 250 A, Gate Trigger Voltage 0.2 to 2 V, Gate Trigger Current 9 to 20 mA, Temperature Operating Range -40 to 100 Degree C. Tags: Stud Mount. More details for C233EHR can be seen below.