The MS TF1275C18F2J from MS Power is a Silicon Controlled Rectifier with Breakover Voltage 1800 V, Breakover Current 18.5 kA, Gate Trigger Voltage 3.0 V, Gate Trigger Current 200 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Disc. More details for MS TF1275C18F2J can be seen below.