The MCC220-28io3 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 2800 V, Breakover Current 235 A, Gate Trigger Voltage 0.9 V, Gate Trigger Current 543 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MCC220-28io3 can be seen below.