The NTE5502 from NTE Electronics is a Silicon Controlled Rectifier with Breakover Voltage 100 V, Breakover Current 200 A, Gate Trigger Voltage 0.25 to 3 V, Gate Trigger Current 0.25 A, Temperature Operating Range -65 to 125 Degree C. Tags: Stud Mount. More details for NTE5502 can be seen below.