Not sure of your skill level, but read
this.
It contains a lot of information, but the key is that it tells you what limits the short circuit current of an IGBT (essentially its gain). And thus this figure is the maximum current that could flow across the device.
Also note that there is a related parameter, "maximum short circuit time" which gives some indication about how long this current can flow before the device gets so hot it starts to fail.
There are many other related issues that the link above covers.