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You are correct, there is no typical circuit breaker on the 831 for the power to the lugs. The inverter monitors the current load on L1 & L2 coming out of the inverter. If the current monitor detects current in excess of the rated current it causes the contactor to open. There isn't any way to...

In general motor driven items draw about 4X the nameplate current at startup until they get up to speed. That high startup current is what's tripping the 831.