The 25NT-120 from Naina Semiconductor is a Silicon Controlled Rectifier with Breakover Voltage 1200 V, Breakover Current 380 to 450 A, Gate Trigger Voltage 3 V, Gate Trigger Current 100 mA, Temperature Operating Range -40 to 130 Degree C. Tags: Screw Mount. More details for 25NT-120 can be seen below.