The WCR03-12M from WeEN Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 1250 V, Breakover Current 20 A, Gate Trigger Voltage 0.25 to 0.8 V, Gate Trigger Current 0.09 A, Temperature Operating Range -40 to 150 Degree C. Tags: Through Hole. More details for WCR03-12M can be seen below.