The 4MBI300VG-120R-50 from Fuji Electric is a IGBT with Gate Emitter Voltage -20 to 20 V, Saturated Collector Emitter Voltage 1.85 to 2.35 V, DC Collector Current 300 to 600 A, DC Forward Current 300 to 600 A, Junction Temperature 150 Degree C. More details for 4MBI300VG-120R-50 can be seen below.