K3 100W recommended fusing

[Chris Kimball]

I hoping to buy a 100W version of the K3 next year.  I note recommendation that the rig be fused on both sides of the 12 V supply line.  What is the recommended fuse type and rating for this application?

[Robin Moseley]

let me google this for you..
http://bfy.tw/3D2O
25A  fuses for 25A current

http://elecraft.365791.n2.nabble.com/fuse-size-td468967.html


Robin G1MHU
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[k6dgw]

TYPE:  The automotive flat inline-blade type seem to be best [RigRunner
uses them].  Very large [relative to other designs] contact area, very
strong wiping-action on insertion and removal.  Not gas-tight, I pull
and reinsert mine every now and then, when I think about it.

RATING:  Since we're fusing the primary power, I think the old ROT [rule
of thumb] has been 125-150% of the likely normal maximum load current.
That of course depends on the configuration of the K3.  My K3/100 has
been fused at 25A for years.  That's close to 150% of key-down.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org

On 12/9/2015 4:00 PM, Chris Kimball wrote:
> I hoping to buy a 100W version of the K3 next year.  I note recommendation
> that the rig be fused on both sides of the 12 V supply line.  What is the
> recommended fuse type and rating for this application?

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[Rick Tavan-2]

I'll second the motion on automotive blade fuses. And Heath Tech (aka High
Sierra Communication Products) currently has a great special offer on an
assortment of high values (5A and up - $9.73 for 120 fuses). Anyone know of
a similar assortment of low values (<5A) at any reasonable price?

/Rick N6XI

On Wed, Dec 9, 2015 at 6:56 PM, Fred Jensen <[hidden email]> wrote:

> TYPE:  The automotive flat inline-blade type seem to be best [RigRunner
> uses them].  Very large [relative to other designs] contact area, very
> strong wiping-action on insertion and removal.  Not gas-tight, I pull and
> reinsert mine every now and then, when I think about it.
>
> RATING:  Since we're fusing the primary power, I think the old ROT [rule
> of thumb] has been 125-150% of the likely normal maximum load current. That
> of course depends on the configuration of the K3.  My K3/100 has been fused
> at 25A for years.  That's close to 150% of key-down.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the Cal QSO Party 1-2 Oct 2016
> - www.cqp.org
>
> On 12/9/2015 4:00 PM, Chris Kimball wrote:
>
>> I hoping to buy a 100W version of the K3 next year.  I note recommendation
>> that the rig be fused on both sides of the 12 V supply line.  What is the
>> recommended fuse type and rating for this application?
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--

Rick Tavan
Truckee, CA
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