The T816 4500-20 from Greegoo Electric is a Silicon Controlled Rectifier with Breakover Voltage 2000 V, Breakover Current 65800 A, Gate Trigger Voltage 3 V, Gate Trigger Current 30 to 200 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Disc. More details for T816 4500-20 can be seen below.