by "Trevor Wilson" <trevor@[EMAIL PROTECTED]
>
Apr 28, 2008 at 12:04 PM
"Phil Allison" <philallison@[EMAIL PROTECTED]
> wrote in message
news:67kk43F2pdepgU1@[EMAIL PROTECTED]
>
> "Trevor Wilson"
> "Phil Allison"
>>
> .
>>>> **Depends on the fuse. I just measured half a dozen 0.25 Amp 3AG
fuses.
>>>> They ranged from 12 Ohms up to 15 Ohms. COLD.
>>>
>>>
>>> ** That is an unbelievably high resistance value - not at all
>>> consistent with a 250mA fuse.
>>
>> **Nevertheless, it is correct.
>
>
> ** What is the brand of the fuses and where did you buy them ?
**UPDATE!
I checked a bunch of the fuses. The ones which measured high were 'Ralmar'
branded. I checked some branded (Littlefuse) ones and found them to be 5.3
Ohms. A couple of unbranded ones in the bottom of the drawer (probably WES
ones) were 5.5 Ohms. The Ralmar fuses have been placed where they belong
(in
the trash). I also checked a Littlefuse M205 type at 4.7 Ohms.
>
> No brand, 1/4 amp 3AG fuses I checked ranged from 3.5 to 4.5 ohms.
>
> These values are at the upper limit for a 250mA rated, fast acting
fuse.
>
>
> These 20mm "T" or delay fuses from Bussman are speced at 0.66 ohms for a
> 250mA size:
>
> http://www.farnell.com/datasheets/81115.pdf
>
> The specs show that R rises to 1 ohm at rated current.
>
>
> ** The cold value is 0.66 ohm - not 12 or 15 ohms.
>
> Your figures are completely non-typical.
**For Ralmar fuses, apparently not. For decent quality fuses - yep.
Trevor Wilson
