You will soon find an assortment of circuit breakers on your coach. Some are thermal reset (they trip and reset on their own) some are the Klixon type (similar to airplane ones), some are as you described, the 110-220vac load center type and then there are these monster push botton breakers all over the coach, especially if you have OTR air. In the engine comparment, in the bays, in all kinds of assorted places, or at least in the Royale conversion.
The bigger the amperage, the bigger the button and I guess the harder to reset. I have enclosed a photo of a small 4 amp, so the corresponding 90 amp is 5 or 6 times as big.