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rabat
Commentator

Join Date: Sep 2009
Posts: 59

Fuse Question

06/03/2010 7:41 PM

Does a fuse care if 120VAC or 24VDC is applied to it?

It is my understanding the fuse block dictates the voltage because of the LED inside them not the actual fuse.

Please correct me if I am wrong.
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Good Answers:

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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: Fuse Question

06/03/2010 7:44 PM

"Does a fuse care if 120VAC or 24VDC is applied to it?"

No.

What LED?
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rabat
Commentator

Join Date: Sep 2009
Posts: 59
#2
In reply to #1

Re: Fuse Question

06/03/2010 7:50 PM

Some fuse blocks come with LED indicator to indicate a blown fuse. Like Allen Bradley 1492-H4 or H5 series fuses blocks.
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4
Tornado
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#3

Re: Fuse Question

06/03/2010 7:51 PM

Fuses typically have a maximum voltage rating, and they can't be used for higher voltages. Thus a 120 volt fuse could work at 24 volts, but a 24 volt fuse could not be used for 120 volts.

If a blown fuse indicator light is used, its voltage must match the voltage on which the fuse is used.

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lyn
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#4
In reply to #3

Re: Fuse Question

06/03/2010 7:59 PM

Oh, that. Sorry.
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redfred
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#5
In reply to #3

Re: Fuse Question

06/03/2010 8:19 PM

Absolutely correct. Using an under voltage fuse (24V fuse in a 120V circuit) can be very dangerous. What happens is that in the event of an overcurrent condition the piece of metal that is supposed to vaporize does this. But instead of breaking the circuit connection an arc forms inside the fuse from the metal vapor and current continues to flow. Next the unintended fuse will burst into flames somewhere.

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kvsridhar
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#6

Re: Fuse Question

06/03/2010 11:12 PM

A 120 VAC fuse may not bother if it is asked to break a 24VDC circuit, but it will care whether it sees 120VAC or 120VDC..since there are no current zeroes, breaking a DC current is that much harder than AC. Severity also depends on the L/R of the load circuit.

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redfred
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#7

Re: Fuse Question

06/03/2010 11:31 PM

There are definitely foolish children running around CR4 lately making many Off Topic votes on correct threads. I suspect that this is in retaliation for refusing to help them with their homework.

At this time Tornado's Good Answer has had two OT votes to cancel the GA.

As proof that Tornado's answer is correct one just has to look at this link on fuse voltage ratings.

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Anonymous Poster
#8
In reply to #7

Re: Fuse Question

06/03/2010 11:37 PM

Yes, i have seen this trend and have been a victim too...i voted GA to Tornado ..let's see if enough right thinking people can neutralise these nuts.
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Tornado
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#9
In reply to #7

Re: Fuse Question

06/03/2010 11:42 PM

Thanks for rising to my defense! Perhaps my occasional truculence has antagonized a couple folks? I'm about to blow my 24 volt fuse.

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redfred
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#10
In reply to #9

Re: Fuse Question

06/03/2010 11:46 PM

It also just didn't seem right that your 100th GA would disappear due to a petulant child. Congratulation Tornado.

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kvsridhar
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#11
In reply to #10

Re: Fuse Question

06/03/2010 11:49 PM

Second that cheers

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kvsridhar
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#12
In reply to #9

Re: Fuse Question

06/04/2010 6:25 AM

Here is an extract from CR4 FAQ on ratings:

"Off-topic should not be used in cases where you disagree with a poster's point of view, nor should they be used to punish another user. Posters who engage in such activity will lose their ability to rate comments and may have their account closed.

Over time, you may see your running tally fluctuate up or down. This is a normal occurrence as other users may see the value of your posts or feel they lack merit. If you feel you have lost good answer votes unfairly, please contact the CR4 Admin and they will investigate. If your case is founded, you will have your GAs returned"

Good opportunity for getting those foolish children off the park.

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TVP45
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#13
In reply to #7

Re: Fuse Question

06/04/2010 3:00 PM

Yes, and I'll give you a GA for pointing that out (since Tornado has already gotten those back and more). What the devil's going on? There's absolutely no question about Tornado being correct. Would it do any good to report these ratings to the mods?

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casteer17
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Location: Troy, NY
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#14
In reply to #13

Re: Fuse Question

06/04/2010 4:00 PM

If a user feels like they are being attacked with OT votes, reporting it to admin allows them to track down the culprit (if there is one), and limit the user if necessary. Does that help?

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redfred
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#15
In reply to #14

Re: Fuse Question

06/04/2010 7:17 PM

Already done.

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Users who posted comments:

Anonymous Poster (1); casteer17 (1); kvsridhar (3); lyn (2); rabat (1); redfred (4); Tornado (2); TVP45 (1)

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