The C228D3HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 300 A, Gate Trigger Voltage 0.2 to 3 V, Gate Trigger Current 40 to 80 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Stud Mount. More details for C228D3HR can be seen below.