The BRY55-400HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 8 A, Gate Trigger Voltage 0.1 to 1.2 V, Gate Trigger Current 200 µA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for BRY55-400HR can be seen below.