The MCO741-22io1 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 2200 V, Breakover Current 2110 A, Gate Trigger Voltage 0.85 V, Gate Trigger Current 29000 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MCO741-22io1 can be seen below.