The YZPST-BT151 from Yangzhou Positioning Tech is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 100 A, Gate Trigger Voltage 0.7 to 0.8 V, Gate Trigger Current 1 to 20 µA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for YZPST-BT151 can be seen below.