The KK400A from Huajing Rectifier is a Silicon Controlled Rectifier with Breakover Voltage 600 to 2500 V, Breakover Current 8500 A, Gate Trigger Voltage 0.9 to 2.5 V, Gate Trigger Current 40 to 250 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Disc. More details for KK400A can be seen below.