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From my interwebs crash-course in IGBT I think Piotrsko is correct. More specifically the peak values are pulse values (measured in couple of ms). Of course there are a ton of variables that influence the time measure (temp, pulse duration, voltage).
Given that the plan is to run 150V, this will have an influence, but not to the extent that 600V 400A rated IGBTs can be usable in that range of current.
I am hoping to draw 500+ batt amps so looks like I need to source some higher rated ones. Maybe use these for a prototype.
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