[Elecraft] K3 - stuck at MCU LD we upgrading software

[Tom]

Thanks Don.  I though the K3S was protected but I did a quick search of the
manual for fuse and only found a reference to fusing both positive and
negative cables if using a battery.


73,
Tom - KQ5S

On Sun, Jan 29, 2017 at 4:47 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> Tom,
>
> The K3 and K3S 100 watt versions have a circuit breaker - that is the
> round thing with the white center on the back panel of the KPA3.
> The lower power circuits are protected by a resettable fuse.  So the K3 is
> capable of protecting itself from overcurrent.
>
> That being said, there is always the danger of a short or other fault in
> the DC wiring that can cause excessive current in the power wire which can
> spew molten metal around causing injury to anyone nearby or starting fires.
> IMHO, any power supply that does not have overcurrent protection should
> have a fuse located near the power source - that is especially true of
> batteries which can source an enormous amount of current.
>
> That fuse near the power supply is not necessarily for protection of the
> equipment, but rather it is for protection of your home and family.
>
> 73,
> Don W3FPR
>
> On 1/29/2017 5:31 PM, Tom wrote:
>
>> Thanks Ron.  Not sure if my old Astron 35A has built in over-current
>> protection or not.  I know it has the crowbar protection for over voltage.
>>
>> Does the K3S have any kind of internal protection like a resettable fuse?
>>
>>