The YZPST-2P4M from Yangzhou Positioning Tech is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 20 A, Gate Trigger Voltage 0.6 to 0.8 V, Gate Trigger Current 0.0002 A, Temperature Operating Range -40 to 110 Degree C. Tags: Surface Mount, Through Hole. More details for YZPST-2P4M can be seen below.