They are also circuit breakers installed in pairs depending on their position in the distribution panel. For example, I just replaced a combination one and it was a 15a/20a combination. My rig also has 15a/15a and single 15amp or 20 amp. That's a lot of spares possibilities. Fortunately, they are readily available at most hardware stores.
I had to take my IOTA panel off to tell, but just a few screws and a look-see should do it. There is a cover you remove, then there are screws in the panel to remove and that should do it. If you don't have to remove any breakers then you can do this without shutting off the power, just don't touch anything.
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