The BTX18-200 from Comset Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 240 V, Breakover Current 10 A, Gate Trigger Voltage 2.0 V, Gate Trigger Current 5.0 mA, Temperature Operating Range 0 to 125 Degree C. Tags: Through Hole. More details for BTX18-200 can be seen below.