The YZPST-X0405NF from Yangzhou Positioning Tech is a Silicon Controlled Rectifier with Breakover Voltage 800 V, Breakover Current 30 A, Gate Trigger Voltage 0.8 V, Gate Trigger Current 50 µA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for YZPST-X0405NF can be seen below.