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Ditto. I would try swapping the breakers. That would eliminate everything in the box except the breaker. I would guess it is a defective breaker. My 003 never trips a breaker, even when pulling a load close to stalling the engine. It will also start my 5 hp compressor without difficulty.

I have an MEP-003A genset and I have never had the main breaker trip, even with large loads. I have an air compressor with a 5 hp motor and it starts fine without tripping the breaker.