[Elecraft] [KPA500] Rear power switch thread

[Richard Fjeld]

The statement below caught my eye, and I thought I would comment FWIW.  A few decades ago, the part of the city I lived in had a momentary open on the power line. When power came back on a moment later, it had a high voltage spike that took out many, many, colored TV sets (and other things) back when color TV sets were relatively new and expensive.

I thought of my ham equipment, so I got a metal box and mounted a 110 Volt relay on it that  fed some outlets attached to boxes on both sides. I bring up the relay with a momentary push switch. The relay then locks up to it's own contacts. To release the relay, I press another momentary switch to open the path to the coil. 

This way, I plug in all equipment I want to protect to the box. If a momentary open hit occurs, the relay drops and powers off all my equipment (which has happened).  It is my master power switch as well.
I power off all my equipment before I release the relay to reduce contact arcing when I re-operate it. The original relay is still in use.

Dick, n0ce

_________________________________________________________________
 Personally, I simply kill the main supply power line to the station. That
> does the same thing with one switch.
>
> 73,
>
> Ron AC7AC


Richard Fjeld, n0ce
rpfjeld at embarqmail.com
E=IR, it's the law.