I do not have a Magnum, but there are 3 overcurrent protectors (Well 4 technically) on my Prosine.
For current incoming: there is a 30 amp breaker in my main box.. If your Magnum is capable of 30 amps, and your RV is 30 amps. trust me it's protected. If you have a 50 amp rv you likely have a breaker, same as I do, in the main breaker panel.
Since my Prosine does not have internal breakers there is a sub panel, Three 15 amp breakers.. That said.. The prosine is only capable of about 20 amps (that is rounded) with 3 15's I can easily exceed that (it can pass 30). so if it is in inverter mode and I'm sucking say 23 amps... It will simply shut down as it's electronic limiters kick in. I do not know if the Magnum has that ability.
