I'm trying to design a solid state circuit breaker using bi-directional switch modules with IGBTs. (Rating: 3phase: 690V AC, 1000A) The problem here would be the transient voltage spikes across the switch and the solution would be to use some kind of voltage suppressors.
Now, I know that MOVs usually wear out with time. However, the switching events are not going to occur very frequency. The switch is only turned off during fault conditions. Usually how long does an MOV last in this scenario? I mean to ask, Can I go ahead only with an MOV or do I need to include an RC snubber as well keeping in mind the fault levels of current as well?
Assume that the MOV needs to be turned off about 2000 times? (Assuming it's life span to be about 15-20 years.)