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Don't worry about the peak amps, size your protection components for continuous current. For the Curtis that's about 200-250A.
The 160V, 250A breaker on this page has been used successfully in many vehicles:

Thanks for the input. I looked at the Airpax and the largest I found is 250 amps.

I running 144 volts and 500 amps and haven't found any circuit breakers (or switches) that handle that much current at that voltage (DC) that doesn't cost a fortune.
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