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post #1 of (permalink) Old 06-25-2007, 09:47 PM Thread Starter
 
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Fuses and voltage ratings

So were looking around the store to find a replacement barrell fuse that blew. We know the amperage, say 5 amps. Now the store has 5 amp 32v, 5 amp 500 volt. This is for a 12 volt device. What is the impact of the voltage rating on the fuse? Isn't it just current that burns out a fuse? What's the voltage rating about? Maximum safe rating, or does it in any way impact the amperage at which the fuse blows?
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post #2 of (permalink) Old 06-25-2007, 10:52 PM
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Keeps current from jumping the gap when it blows. Higher voltage can jump a wider gap.

You can use a fuse rated for a higher voltage than you need. Note: Unless it's othewrwise stated, that is an AC voltage rating.

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Last edited by CJ7Taz; 06-25-2007 at 11:04 PM.
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post #3 of (permalink) Old 06-25-2007, 10:56 PM Thread Starter
 
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Is it permissable to any higher voltage rating than the application? A 250 v fuse in a 12 volt circuit? The 250v's are especially common when looking for oddball lengths like 3/4" fuses.
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post #4 of (permalink) Old 06-25-2007, 11:04 PM
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Yep, that’s why my post was edited for that second line. 250V for 12 V is fine.

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post #5 of (permalink) Old 06-26-2007, 11:57 AM
 
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I sure hope taz isn't doing the usual taz thing....
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post #6 of (permalink) Old 06-26-2007, 12:01 PM
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Quote:
Originally Posted by Junk Yard Genius View Post
I sure hope taz isn't doing the usual taz thing....
Indeed I am, giving accurate information.

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post #7 of (permalink) Old 06-26-2007, 10:32 PM
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Quote:
Originally Posted by Junk Yard Genius View Post
I sure hope taz isn't doing the usual taz thing....
Maybe a diode?


Dale

Excellent Bad Example
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post #8 of (permalink) Old 06-26-2007, 10:42 PM
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Quote:
Originally Posted by OlllllllOCJ View Post
Maybe a diode?


Dale
Hey, I was just talking about you and that diode in another thread.

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post #9 of (permalink) Old 06-27-2007, 12:28 PM
 
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Absolutely permitted!!!

...And encouraged/recommended to use higher voltage rated fuses in automotive applications!

As voltage increases, so does resistance of the fuse material as it heats up. The fuse will be accurate to it's rated voltage, in your case, it will be accurate up to a 250 volt current path...
That doesn't mean it will be less accurate at lower voltages.

The 250 volt mark is about standard (so it can be used in 220/240 volt hardware).
Anything under 250 volts is considered 'Low Voltage' in most electronics circles, that's why the 250 volt rating.

Also, most of the worlds electrical utilities supplies are under 250 volts, so the same fuse can be sold in most countries and do the job just as it is.

Your fuse will be accurate in your 12 volt system, no problem.
------------------

Quote:
dale wrote:
"Maybe a diode?"
Again, dale doesn't have a clue what he's talking about.
DO NOT attempt to substitute a diode for your circuit protection!

Since discovering diodes in one of my posts, and finding one at Radio Shack, dale has had a fixation with diodes. Don't ask me why.
Probably because they have 'Magical Powers' he doesn't understand.

dale got spanked here too often, so dale frequents another bbs now...

dale has said in writing he wants to ruin this bbs because he posts on another bbs now, so he's trying to get you to melt your rig down.

Not very nice of dale, and the moderators should ban him for trying to get you to damage your vehicle...
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post #10 of (permalink) Old 06-27-2007, 01:27 PM Thread Starter
 
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Thanks all, that's good to know. When time is short and you know why the fuse blew, its good to have more opportunities to find a replacement or in this case substitute.
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