The MCR100-8R from Kexin is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 10 A, Gate Trigger Voltage 0.1 to 1.2 V, Gate Trigger Current 200 uA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MCR100-8R can be seen below.