I found this circuit in an older post. I was thinking about using this in place of a contactor to break under load. The load would be at 500V 300A DC. There would be overcurrent protection in line with this. I do realize that this would be less efficient than a contactor and maybe more expensive. What am I missing? There seems to be little information out there about using an IGBT as a relay or contactor and I assume it's for a reason. What forums I have found people have said it would be too dificult but the explination stops there.
I'm currently using this IGBT (FZ600R12KE3) in a small setup switching 350V 30A about 20-30 time a day and have not seen any issues yet.