The SKT 40/04D from Semikron Danfoss is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 600 to 700 A, Gate Trigger Voltage 3 V, Gate Trigger Current 150 mA, Temperature Operating Range -40 to 130 Degree C. Tags: Screw Mount. More details for SKT 40/04D can be seen below.