The MAC4120NHR from Digitron Semiconductors is a Triac with Breakover Voltage 800 V, Breakover Current 100 A, Gate Trigger Voltage 0.2 to 4 V, Gate Trigger Current 50 to 200 mA, Temperature Operating Range -65 to 100 Degree C. Tags: Stud Mount. More details for MAC4120NHR can be seen below.