Quick blow fuses ?

L

little billy

Guest
Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?
 
"little billy" <littlebilly@btinternet.com> wrote in message
news:24fcdb4a.0408030449.15e0c2e6@posting.google.com...
Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?
Click to expand...
The fuse blows at the same current regardless of the voltage but the
enclosure is designed to provide containment of the arc at 250v.
So the answer is yes :)

--
Regards ........... Rheilly Phoull
 
In article <24fcdb4a.0408030449.15e0c2e6@posting.google.com>,
littlebilly@btinternet.com (little billy) wrote:

Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?
Click to expand...
It doesn't care about the voltage. It'll blow if something manages to
draw more than an amp (or close to it - fuses are pretty accurate, but I
doubt that one has ever been made that's *EXACT*) through it at anywhere
from a voltge that's barely measurable, on up through 250 volts (And
beyond, but read on) The 250 rating is all about "When this puppy blows,
there's gonna be an arc that we don't want hitting anything else - This
fuse is designed to soak up, contain, or otherwise safely handle the arc
that a 250 volt source would produce." Which means that for a 9 volt
application, the "anti-arc" capability is overkill. It won't do any
harm, but it's "wasted effort", in a manner of speaking. Particularly if
you can get a 1 amp, closer-to-9-volts fuse for lower cost. (Not that
the cost of the fuse means much in a one-off situation like yours, but
even a penny difference in the cost of a part can make a significant
difference when talking about a production run of
who-knows-how-many-million units)

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
 
Rheilly Phoull wrote:

"little billy" <littlebilly@btinternet.com> wrote in message
news:24fcdb4a.0408030449.15e0c2e6@posting.google.com...
Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?

The fuse blows at the same current regardless of the voltage but the
enclosure is designed to provide containment of the arc at 250v.
So the answer is yes :)
^^^
Click to expand...
s/yes/no/

(he said "only ... 250")

Cheers!
Rich
 
"Rich Grise" <null@example.net> wrote in message
news:qNSPc.1151$P16.1043@nwrddc04.gnilink.net...
Rheilly Phoull wrote:


"little billy" <littlebilly@btinternet.com> wrote in message
news:24fcdb4a.0408030449.15e0c2e6@posting.google.com...
Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?

The fuse blows at the same current regardless of the voltage but the
enclosure is designed to provide containment of the arc at 250v.
So the answer is yes :)
^^^
s/yes/no/

(he said "only ... 250")

Cheers!
Rich
Click to expand...
Hmm, still havent found something to do Rich ?? :)

--
Regards ........... Rheilly Phoull
 
"little billy" <littlebilly@btinternet.com> wrote in message
news:24fcdb4a.0408030449.15e0c2e6@posting.google.com...
Hello all,

A question about fuses:

If a Quick Blow (glass type, 20mm) fuse is rated 250V 1A
can I use it to protect a 9v ni-mh battery as well, or
will it only blow if the voltage is 250 ?
Click to expand...
Hi,
You already got your answers but I would like to add:
The fuse that you describe is probably expecting AC. You would be better off
with an automotive fuse, they are usually rated 32VDC.
There is a slight difference in performance, probably not of any concern to
you now but I mention it just for you education since your previous posts
indicate to me that you want to learn.
Best Regards,
Tom
 
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