The X0405G-6-A-AA3-R from Unisonic Technologies is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 30 to 33 A, Gate Trigger Voltage 0.8 V, Gate Trigger Current 200 uA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for X0405G-6-A-AA3-R can be seen below.