About 1-3 times per summer the same fuse blows in my AC service disconnect. Always the one on the left. The fuses are 30A and on the panel there are two 30A breakers. The fuse blows typically on a very hot day when the AC runs for quite a while. My guess is that there's just a bit more resistance on that side due to age ( or loose wire or evil spirits?) and that causes the fuse to fail. The breakers never trip.
Given that upstream there are 30A breakers the disconnect fuses don't seem particularly necessary (also the panel is ~5 feet from the disconnect). Is there any reason I shouldn't replace the disconnect with a non-fused model?
Does it even make sense that the disconnect itself could be the culprit, or should I be hunting other issues?