I installed a Victron Orion 24/12-70 stepdown converter into my RV within the last month and it initially worked as intended. I had it fused on the 24V input side with a 30-amp inline fuse. Today the fuse was blown. I attempted to replace the fuse and it immediately sparked. I confirmed all 12-volt loads were off and I removed the remote on/off connector from the Orion, then attempted to replace the fuse again. It again immediately arced and destroyed the fuse. I am assuming there must be an internal short-circuit in the Orion. Any other possibilities I might be missing?