Need to know the amperage for a 12 volt circuit breaker

[Barry1]

I am replacing my 12 volt circuit breaker that is between the battery and the converter on my 2006 FR Surveyor (model SV210). My problem is that the old breaker has no amperage identification on it. I was told by a local RV repair center that it should be a 20 amp. I would just like to get the forums opinion on this.

[Bama Rambler]

On our 2006 GS280 the resettable breaker was a 40 amp. On the SV210 it's probably a 30 amp though it could be a 40 amp. I'd be surprised if it's just a 20 amp.