The FD300R12KS4 from Infineon Technologies is a IGBT with Gate Emitter Voltage -20 to 20 V, Saturated Collector Emitter Voltage 3.20 to 3.85 V, DC Collector Current 300 A, Peak Collector Current 600 A, DC Forward Current 300 A. More details for FD300R12KS4 can be seen below.