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Fuses in power cable

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Gary K9GS

Fuses in power cable

Just completed building my K3 this week and taking a break from SB80M LP.

Something occurred to me.....There are no fuses in the K3 power cord. I
use a commercial lab quality power supply. Does anyone use in-line fuses?

--

73,

Gary K9GS

Check out K9NS on the web: http://www.k9ns.com
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com

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Matt Zilmer

Re: Fuses in power cable

I use 30A inline fuses for K3/100. These are the same as used with
the Motorola two-way radios (Micor, Syntor / X). Fuses and the
holders are also available from Mot parts. They are very robust (and
also not cheap!). They splice directly inline with up to 6 AWG cable.

And congrats on your shiny new K3!

matt W6NIA

On Sat, 19 Feb 2011 19:16:33 -0600, you wrote:

>Just completed building my K3 this week and taking a break from SB80M LP.
>
>Something occurred to me.....There are no fuses in the K3 power cord. I
>use a commercial lab quality power supply. Does anyone use in-line fuses?
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Phil Kane-2

Re: Fuses in power cable

On 2/19/2011 5:52 PM, Matt Zilmer wrote:

> I use 30A inline fuses for K3/100. These are the same as used with
> the Motorola two-way radios (Micor, Syntor / X). Fuses and the
> holders are also available from Mot parts. They are very robust (and
> also not cheap!). They splice directly inline with up to 6 AWG cable.

They are also available from any well-stocked auto or RV supply
store at a price much less than what The Big Emm charges.

-- 73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402

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Matt Zilmer

Re: Fuses in power cable

Thanks for that Phil. I bought the fuses at a swap meet for $4.50 for
a box of 12, but had to buy the inline MOT holders from MOT itself.
Will look in RV supply stores from now on. Or at least if I ever burn
one of these 30A or 40A cartridges.

matt W6NIA
K3 #24

On Sat, 19 Feb 2011 18:10:26 -0800, you wrote:

>On 2/19/2011 5:52 PM, Matt Zilmer wrote:
>
>> I use 30A inline fuses for K3/100. These are the same as used with
>> the Motorola two-way radios (Micor, Syntor / X). Fuses and the
>> holders are also available from Mot parts. They are very robust (and
>> also not cheap!). They splice directly inline with up to 6 AWG cable.
>
> They are also available from any well-stocked auto or RV supply
> store at a price much less than what The Big Emm charges.
>
>-- 73 de K2ASP - Phil Kane
> Elecraft K2/100 s/n 5402
>
>______________________________________________________________
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Don Wilhelm-4

Re: Fuses in power cable

In reply to this post by Gary K9GS

Gary,

The K3/100 has a circuit breaker which will protect the K3 itself. Any
fuse added will be to protect the power cord itself. Use whatever seems
appropriate for you - 30 amps comes to mind.

73,
Don W3FPR

On 2/19/2011 8:16 PM, Gary K9GS wrote:
> Just completed building my K3 this week and taking a break from SB80M LP.
>
> Something occurred to me.....There are no fuses in the K3 power cord. I
> use a commercial lab quality power supply. Does anyone use in-line fuses?
>
>
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Matt Zilmer

Re: Fuses in power cable

Hi Don,

I thought the CB protects only the HPA on the K3. I'll go back to the
manual to be sure (but I'm pretty sure of this).

Isn't there a resettable fuse for the non-HPA subs? Going back in
memory, I seem to remember that. Sheesh! How could I forget?

matt W6NIA
K3 #24 seems a long time ago....

On Sat, 19 Feb 2011 22:01:13 -0500, you wrote:

> Gary,
>
>The K3/100 has a circuit breaker which will protect the K3 itself. Any
>fuse added will be to protect the power cord itself. Use whatever seems
>appropriate for you - 30 amps comes to mind.
>
>73,
>Don W3FPR
>
>On 2/19/2011 8:16 PM, Gary K9GS wrote:
>> Just completed building my K3 this week and taking a break from SB80M LP.
>>
>> Something occurred to me.....There are no fuses in the K3 power cord. I
>> use a commercial lab quality power supply. Does anyone use in-line fuses?
>>
>>
>______________________________________________________________
>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

Don Wilhelm-4

Re: Fuses in power cable

Matt,

You are correct, there is a resettable fuse for the non-KPA3 power. And
those resettable fuses operate quickly. Still a fuse near the power
supply is a good idea to protect the wire - but if the power supply has
current limiting, and that current limit is reasonable for the wire
size, a fuse may not be necessary. Like everything else -- it all depends.

73,
Don W3FPR

On 2/20/2011 12:16 AM, Matt Zilmer wrote:

> Hi Don,
>
> I thought the CB protects only the HPA on the K3. I'll go back to the
> manual to be sure (but I'm pretty sure of this).
>
> Isn't there a resettable fuse for the non-HPA subs? Going back in
> memory, I seem to remember that. Sheesh! How could I forget?
>
> matt W6NIA
> K3 #24 seems a long time ago....
>
> On Sat, 19 Feb 2011 22:01:13 -0500, you wrote:
>
>> Gary,
>>
>> The K3/100 has a circuit breaker which will protect the K3 itself. Any
>> fuse added will be to protect the power cord itself. Use whatever seems
>> appropriate for you - 30 amps comes to mind.
>>
>> 73,
>> Don W3FPR
>>
>> On 2/19/2011 8:16 PM, Gary K9GS wrote:
>>> Just completed building my K3 this week and taking a break from SB80M LP.
>>>
>>> Something occurred to me.....There are no fuses in the K3 power cord. I
>>> use a commercial lab quality power supply. Does anyone use in-line fuses?
>>>
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
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>
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>