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If the designer of a low current devise like a pre-amp calculates for a fuse of 200ma would it then be ok, safe, kosher to ignore that number and put in a 500ma fuse which is 2.5 times the current rating the one the designer of the amp thought appropriate? Thanks, Tweaker456
"The loaded carry does more to expand athletic qualities than any other single thing I've attempted in my career as a coach and athlete. And I do not say that lightly." Dan John
Follow Ups:
If circuit stayed perfect forever, you would NOT need a fuse.
I'd personally try to get the fuse recommended by the designer / builder.....but that's just me.
Too much is never enough
just get a small supply of the correct value.
Well, if you have a legitimate failure you'd probably pop either fuse.
Sizing fuses on equipment can be more tricky than it might seem. You want to provide protection, but you also don't want nuisance openings during turn-on either. It's an iterative process, somewhat.
Cross-posting into another area so you could needle Duster is funny.
Dave.
If I recommended a fuse 2.5 times what the designer calculated for I would have been nail to a cross. I can tell you that!
"The loaded carry does more to expand athletic qualities than any other single thing I've attempted in my career as a coach and athlete. And I do not say that lightly." Dan John
No, but you probably would have been questioned about it. :)
I'm not sure why you're twisted up about this. I quit taking Duster seriously years ago.Dave.
Edits: 07/14/21
+1
"The loaded carry does more to expand athletic qualities than any other single thing I've attempted in my career as a coach and athlete. And I do not say that lightly." Dan John
Fast Blow fuse, use 2x current draw. Slow Blow fuse, use 1.25 times the current draw. Fuses can operate up to 1.5x the fuse current rating for up to 20 minutes.
Personally, I use Slow blow at as close to current draw as possible with capacitor input power supplies. Choke input power supplies not having a high input charging surge, I use Fast Blow at as close to current rating as possible. Never had a fuse fail.
Probably maybe but not definitely.
"The loaded carry does more to expand athletic qualities than any other single thing I've attempted in my career as a coach and athlete. And I do not say that lightly." Dan John
fuses are NOT brick walls. A 1 amp fuse doens't pop at 1.01 amps instandtly.
You'll have to look at the time / current charts on the LITTLEFUSE website.
Also? As near as I can figure, you have 3 types of fuse.
Standard.....in MOST equipement regardles of current
Slo-Blow....Maybe the next most common, and will withstand higher current / time before fusing
And
FAST blo, used in some delicate electronics. Thsese pop as nearly instantly as they can engineer.
NEVER over curren the fuse. A POSSIBLE but not recommended exception? Gear requries a 2 amp slo-blo. I dont' know, but you MAY get away with a slightly larger, standard type-fuse.....But I have never heard of anyone actually DOING SO......You may want to write to an applications guy at one of the big fuse companies.
Too much is never enough
No, you shouldn't exceed the current rating recommended by the manufacturer. Otherwise, you run the risk of doing serious damage to the component if a fault occurs in the component and the fuse doesn't blow at 200-ma to provide the required protection.
Good luck,
John Elison
Hum, that funny. Over at Tweaker's Asylum duster is recommending a 500ma fuse in a pre-amp that came with a 200ma fuse.
"The loaded carry does more to expand athletic qualities than any other single thing I've attempted in my career as a coach and athlete. And I do not say that lightly." Dan John
Most circuits have multiple components. Consider that, with a 200 mA fuse, for example, you may lose one component before the fuse pops, but still protect other components in the circuit. With a 500 mA fuse, you may still be protected from starting a fire, but end up losing multiple components in the circuit before it pops.
Since you're the owner, you can actually use any size fuse you want that's equal to or greater than 200-mA. So long as no circuit faults occur, you'll be just fine. But, if anything should happen to go wrong, there's greater risk of serious damage when using a fuse larger than 200-mA.
Best regards,
John Elison
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