The guru on fuses:


For two years, I have asked why and how fuses could possibly matter. All I got was arguments of faith, pro or con. I needed a real audio guru who actually knows. Here is a link from John Curl’s discussion on Parasound’s website. He engineered and designed some some great equipment, including some Mark Levinson gear, The Grateful Dead’s 30 plus McIntosh amp powered Wall of Sound, and his admittedly, somewhat price compromised Parasound designs. He discusses the electrical properties of standard fuses, showing how they are compromised. The entire article is quite enlightening, but to skip to the fuse section, go to the bottom half of page 6. https://www.parasound.com/pdfs/JCinterview.pdf

danvignau
bluemoondriver,

Yes, negligible to voltage as well.

A fuse is a current device. It reacts to the current flow in it. It is not voltage dependent. The only reason they MAY put a voltage rating on it is to make sure that you do not use it in a circuit which may be above its maximum INSULATION voltage, for safety. But its blowing parameter is ALWAYS in Amperes, not volts.

Having said that, a typical device, assuming it can operate with multiple voltages, will usually draw HALF as much current when used with 240 Volts as it does when used with 120 Volts.

So, if you are using .. say a 1200 watt power consuming amplifier, at 120 Volts, it will draw 10 amperes when operating at its maximum volume and will need a 10 amp fuse. When you take this device to the UK for example (assuming it DOES work there and has a voltage selector on it to allow that), the same device will now need only a 5 amp fuse, since it is now connected to 240 Volts.

NONE OF THE ABOVE IN ANY WAY WILL AFFECT THE SOUND. IT IS ALL FOR SAFETY.

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Of most importance now, is to use two fuses in line (one following another) .... like we are supposed to now wear two masks. For utmost safety. Oh wait, now media is suggesting THREE masks .. 🙄
Why is this still a thing?
Because BS must be stamped out at all costs in this industry, to keep this hobby honest.