The MCD160-30io3 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 3000 V, Breakover Current 170 A, Gate Trigger Voltage 1.2 V, Gate Trigger Current 385 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MCD160-30io3 can be seen below.