The FZ1800R12HP4_B9 from Infineon Technologies is a IGBT with Gate Emitter Voltage -20 to 20 V, Saturated Collector Emitter Voltage 1.70 to 2.10 V, DC Collector Current 1800 A, Peak Collector Current 3600 A, DC Forward Current 1800 A. More details for FZ1800R12HP4_B9 can be seen below.