<[email protected]> wrote:
>
> Group,
>
> I have an interesting problem with a mains filter
> and fuse. We have a product with a 6 amp filter that
> can draw up to a maximum of about 5.8A. The filter
> has a built in 20mm fuse holder and we would normally
> fit a T type HBC fuse.
>
> The problem is that all fuses appear to be available
> in prefered values, the nearest of which being 5 (too
> small) or 6.3 (too large)
>
> I'm sure that this is not the first time someone has
> encountered this so your comments would be appreciated.
> Ideally we are looking for a 20mm 6AT HBC fuse with
> european and UL approval or recognition. Does anyone
> know where I can obtain such a fuse?
>
> Many thanks is advance,
Personally, I've never fused anything right at it's
normal operating current. I derate fuses due to temp
variations and inrush. There's even a couple of people
right here on the list who have published some very
well written articles on the subject and I hope they
pipe up. About the derating part, I mean.
So, I guess what I'm saying is ... I don't understand
why the 6.3A fuse is "too large" for a nominal of 5.8A.
Maybe there's something about the circuit or the temps
or the inrush I don't understand.
Why is 6.3 too large for a catastrophic fault when
the nominal is 5.8A?
Regards, Doug McKean
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