they are probably IGBTs.
can you identify if the gate drive is bypolar? if the gate is sucked down to -15 or even -5 during turn off they are most likely igbts. of course you can check the on resistance yourself without a lot of work.
the part number itself doesn't look like a typical fet part number but i can't find anything.
in any case, 4 of those would make a nice 6kw inverter.