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Author Topic: CB550 Fuse voltage?  (Read 935 times)

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Offline BogdanZ

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CB550 Fuse voltage?
« on: February 01, 2018, 04:37:09 pm »
Hey guys,
I need to replace my 3 fuses which I know are 5A, 7A, and 15A. My question is what voltage should I replace them with? The website I'm buying them from has a 7 Amp fuse in both 125V and 250V, for example.

Thanks for your help!
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1976 CB550

Offline Bodi

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Re: CB550 Fuse voltage?
« Reply #1 on: February 01, 2018, 05:01:44 pm »
Technically you should use a 32V automotive fuses, but any voltage should be acceptable. The metal used and internal resistance is different but they will work.
Essentially 32V fuses are designed for a lower voltage drop, with a 12V system you want minimal drop. Higher voltage fuses must blow in a way that does not create arcing, with 12V the possibility of arcing is next to nonexistent. A 32V 15A fuse usually has a fairly larger "I" shaped link probably made of low melting point metal, a 15A 120/240V fuse has a thin wire that gets red hot before it blows. 20,000V fuses are as long as your arm and packed with arc suppressing stuff. Still, they will all blow when overloaded.
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Offline FuZZie

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Re: CB550 Fuse voltage?
« Reply #2 on: February 01, 2018, 10:13:06 pm »
Quote
Higher voltage fuses must blow in a way that does not create arcing, with 12V the possibility of arcing is next to nonexisten

They have to look after arcing in fuses for 12v too it does happen. :)
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Offline TwoTired

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Re: CB550 Fuse voltage?
« Reply #3 on: February 02, 2018, 01:00:57 am »
I just posted this in another thread...
This is an excerpt from:http://www.littelfuse.com/~/media/electronics/product_catalogs/littelfuse_fuseology_selection_guide.pdf.pdf
Pg 4

"As mentioned previously (See RERATING section), fuses
are sensitive to changes in current, not voltage, maintaining
their “status quo” at any voltage up to the maximum rating
of the fuse. It is not until the fuse element melts and
arcing occurs that the circuit voltage and available power
become an issue. The safe interruption of the circuit, as it
relates to circuit voltage and available power, is discussed
in the section on INTERRUPTING RATING.
To summarize, a fuse may be used at any voltage that is
less than its voltage rating without detriment to its fusing
characteristics. Please contact the factory for applications
at voltages greater than the voltage rating."
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Offline BogdanZ

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Re: CB550 Fuse voltage?
« Reply #4 on: February 06, 2018, 02:58:50 pm »
O interesting! Thanks for the info everyone. So I guess 125V and 250V should both work. It's been very hard to find the 1" glass fuses that these bikes use (most are 1.25") so it's very helpful to know you can use either voltage.

If anyone is looking, I finally found the right fuses at AllFuses.com

Like the name implies, they have all the fuses haha
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1976 CB550

Offline FuZZie

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Re: CB550 Fuse voltage?
« Reply #5 on: February 06, 2018, 03:12:12 pm »
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