Dual element fuse sizes are selected by different maths than the typical fuse. The ARC fuse is sized closer to the overload trip than the short trip. Single element fuses only do shorts. In this case, the overload trip is the fuse rating and is 5 amps and the short trip is, I dunno, 7 amps. If you substitute a 5 amp single element it will trip since 7 amps is coming through on inrush.
Quick fuse question
Hello guys. I have a quick fuse question. I have a ARC D200 amp that uses a MDQ5A fuse.The MDQ is a dual element fuse. I have purchased some Aucharm fuses for my pre and phono stage and they sound great. What would be the replace size for the MDQ5A fuse? I put in a standard 5Afuse and the amp ate it for lunch. Thanks for your time and effort guys.