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

[Don Wilhelm]

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?
>