The MCR22-4HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 200 V, Breakover Current 15 A, Gate Trigger Voltage 0.8 to 1.2 V, Gate Trigger Current 30 to 500 µA, Temperature Operating Range -40 to 110 Degree C. Tags: Through Hole. More details for MCR22-4HR can be seen below.