The BT137-800D from Continental Device India is a Triac with Breakover Voltage 800 V, Breakover Current 65 to 71 A, Gate Trigger Voltage 0.4 to 1.5 V, Gate Trigger Current 5 to 70 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for BT137-800D can be seen below.