The 2N2574HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 50 V, Breakover Current 260 A, Gate Trigger Voltage 0.3 to 3.5 V, Gate Trigger Current 40 mA, Temperature Operating Range -65 to 125 Degree C. Tags: Through Hole. More details for 2N2574HR can be seen below.