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Multimeter fuses

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Berni:
I looked in to it a bit and i see that the small HRC fuses found in good multimeters tend to have about 20kA breaking capacity. So my capacitor bank does not have nearly enough grunt to cause a genuine HRC fuse to fail catastrophically.

Issue is that you need a low voltage cap bank for the test to be valid as the fuses tend to be rated up to 400 VAC. So to get 20kA of peak current out of it the cap bank has to have both low resistance and inductance along with quite a bit of jules to sustain that for one 50Hz cycle.

If anyone thinks they have a cap bank that fits the bill id love to see some testing.

JackM:
Where can one buy genuine HRC fuses in Canada? Digikey.ca offers no alternatives aside from the Bussman/Eaton brand which they sell for $47 CAD (440mA) and $57 CAD (10A) each... Mouser has a cheaper Schurter brand 10A fuse, but I'm having a hard time finding alternatives for the 440mA fuses from a reputable source.

retiredcaps:

--- Quote from: JackM on July 12, 2016, 02:18:09 pm ---Where can one buy genuine HRC fuses in Canada?

--- End quote ---
Littlefuse also makes 440mA fuses that are used in high end meters.

A quick search shows Newark sells the 440mA fuse for $9.80 CDN.

http://canada.newark.com/fluke/943121/fuse-replacement-440ma-fast-acting/dp/52F4514

Newark has the 11A fuse for $13.02 CDN.

http://canada.newark.com/fluke/803293/fuse-only-replacement-11a/dp/20C4137

I have NO IDEA what Newark charges for shipping and what courier they use.

Fungus:

--- Quote from: retiredcaps on July 13, 2016, 02:56:49 am ---
--- Quote from: JackM on July 12, 2016, 02:18:09 pm ---Where can one buy genuine HRC fuses in Canada?

--- End quote ---
Littlefuse also makes 440mA fuses that are used in high end meters.

--- End quote ---

And SIBA: http://www.ebay.com/itm/201613339114


joeqsmith:

--- Quote from: Berni on July 12, 2016, 10:22:58 am ---I looked in to it a bit and i see that the small HRC fuses found in good multimeters tend to have about 20kA breaking capacity. So my capacitor bank does not have nearly enough grunt to cause a genuine HRC fuse to fail catastrophically.

Issue is that you need a low voltage cap bank for the test to be valid as the fuses tend to be rated up to 400 VAC. So to get 20kA of peak current out of it the cap bank has to have both low resistance and inductance along with quite a bit of jules to sustain that for one 50Hz cycle.

If anyone thinks they have a cap bank that fits the bill id love to see some testing.

--- End quote ---

None of the 10mm ones I have seen were rated for 400V. 

SIBA, 50-199-06, 10A, 1000V 30kA, made in Germany, solid
Littlefuse, FLU 11A, 11A, 1000V 20kA, assembled in Mexico, woven
Littlefuse, FLU 44/100A, 440mA, 1000V 10kA, assembled in Mexico, woven
Cooper Bussmann, DMM-B-44/100, 440mA, 1000V, 10kA, woven
Fluke packaged Bussmann, DMM-44/100, 440mA, 1000V, 10kA, assembled in Mexico, woven

That large cap Photonicinduction shows to blow one apart would be the ticket.  Best to know what your doing if you wanted to buy one to play with.   I know my tiny half cycle generator would not come close to making any of them explode.   

If I could get some of these fake Amazon fuses, these may actually come apart by the sounds of it. 

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