My generator has two main breakers. When you overload it they are the first thing to trip. They are located on the side of the generator. One is a 20 amp and one is a 30 amp. I realize that some gennys have just one what I call "main breaker" but this one has two. That's why I have been referring to them at 'breakers'. Everyone that I have asked about this, that's their first question they ask me is if I checked them. To my knowledge and based on the Onan manual that I have, there are no other breakers on the genset itself.