Amps are amps...right?
Be nice ok? Size of wire determines current capacity (amps) as I believe. Recently had to replace a 30 amp fuse(U shaped). Had small size about same as a dime but needed next larger, about size of...
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mike-s wrote:ScottG wrote:As I said above, an AGS-30 fuse will have a voltage drop of about 0.12 V @ 30 A current. That works out using Joule's Law (which is commonly combined into Ohm's law), to be 3.6 W which the fuse has to dissipate. Go to 100 A, and you're closer to 100 W, which melts the link in under a second.
Someone else said it had to do with ohms law - it doesn't. It is soley the heat caused by current that melts the fuse.
Those that are suggesting voltage has something to do with it need to read up on the current/coulombs relationship with special attention to what is not included.
But yes, the circuit voltage doesn't make any difference to when the fuse blows, only the current.
To that end, I've seen where a person put way too small of a fuse in a circuit and while the current was insufficient to blow said fuse, the fuse acted as a current limiting resistor and limited the divices output.
