Is there a fuse on the converter? YES. But
Converters (for this discussion) come in 2 types. one is built into the power distribution center. Typically this type will have both fuses and breakers behnd a common door.. And the fuse, is typically one of the two fuses on the fuse panel (they will be the largest fuses (Typically 30 anmp)
The other type the converter is a box all by itself.. In this type it will have fuses ON BOARD.. may be hard to find without tools though.
On my RV, the converter is a good 15 feet from the fuses, stand alone and PLUG IN.. It has failed several times.. All for the same reason........
Some stupid idiot knocked the plug out of the socket (As to who.... Well I'm the only one rummaging around in that area so.....)