Reddit reviews MidNite Solar Photovoltaic DC Circuit Breaker - 30 Amp, Model# MNEPV30

You'll want their 150 volt model, not the 300 volt. :)
While the 300 volt one would be fine, it's excessive. :P

Keep in mind, your breaker has to be rated for the VoC, not the VmP.
So, 'the absolute max your panels could put out' in voltage, at least. :)

A breaker is an important safety device, and you want it to do it's job, day in and day out, no matter what slight variances occur. That's why I advise the use of a Midnite Solar or similar breaker, rated for DC and rated for a voltage of ~100 - 150 volts.

Trust me when I say, those cheap breakers could really burn your RV down given the right conditions. D:

EDIT:
Here's the breaker I'd recommend:
https://www.amazon.com/MidNite-Solar-Photovoltaic-Circuit-Breaker/dp/B004EQJS1S/

Tip: Get a cheap section of DIN mounting rail from your local hardware store or Amazon. That way you could mount your breaker inside a plastic box with the rest of your splices, and end up with a neat and tidy DIY combiner. :)