[Elecraft] new owner looking for fuses.

[Bob McGraw K4TAX]

Hence the reason for 3AC fuses.  They have a ceramic body and don't explode.  Of course the only way to tell if they are open is to measure them. 

Bob, K4TAX


Sent from my iPhone

> On Jul 15, 2018, at 10:18 AM, K9MA <k9ma at sdellington.us> wrote:
> 
> Also, fuses rated 250 V AC are typically rated only 32 V DC.  That's because, with AC, the current goes to zero twice per cycle, so the arc can go out. Not so with DC. I suspect the standard 28 V DC once used in many aircraft was chosen because that's about the highest voltage which can be switched with a mechanical relay or switch. (Something about the energy required to strip electrons from the metal contacts.) Solid-state switches, of course, don't have that problem, hence the popularity of higher voltage DC systems now.
> 
> Long ago, I put a 3AG fuse in series with the finals' cathodes of a T-4XB. The first step in replacing that fuse when it blew was to shake all the glass out of the radio.
> 
> 73,
> Scott K9MA
> 
> 
> 
>> On 7/15/2018 05:22, Roy Koeppe wrote:
>> One reason 'all fuses' aren't just rated at 250v to be done with it is that a shorter element section in a lower voltage fuse can have a lower resistance, due to the shorter arc gap allowed. Thus lower voltage drop for a low voltage circuit, etc.
>> 
>> 73,   Roy    K6XK
>> 
>> 
>> 
>> 
>> 
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> 
> -- 
> Scott  K9MA
> 
> k9ma at sdellington.us
> 
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