IOTA Circuit breaker Box

Circuit breakers are fairly standardized; there are only a few common residential types, and virtually all RVs use the most common one. If you bring the existing breaker to your big box store or electrical supply place, they should be able to get you an appropriate one. There's a reasonable chance the sticker in the electrical box also gives some specifications.

Iota's web site doesn't appear to have documentation readily available on their old products, unfortunately.