The answer to 'why is my generator tripping breaker' is that there are several common causes, including overloading, short circuits, and faulty electrical components. When a generator's electrical load exceeds its capacity, the circuit breaker will trip to protect the system from damage. Short circuits and malfunctioning parts like the alternator, voltage regulator, or wiring can also trigger the breaker to trip.
If your generator's circuit breaker is tripping, first check the electrical load to ensure you're not exceeding the generator's rated capacity. Unplug any unnecessary devices and try resetting the breaker. If it trips again, there may be an underlying issue that requires professional diagnosis and repair.