The MDC320-30io2 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 3000 V, Breakover Current 327 A, Gate Trigger Voltage 1.15 V, Gate Trigger Current 765 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MDC320-30io2 can be seen below.