[AMRadio] Breaker Info

Mike Dorworth, K4XM k4xm at arczip.com
Mon Dec 4 13:01:32 EST 2006

There are so many " What if's" that only guessing works well. There are also
" Shunt Trip" breakers that break with say 50 mills to cut a 20 amp circuit.
Usually we think of a  breaker with a bi-metal strip heating and curling out
of the way at a certain temp caused by over current. Some even reset by
themselves!. The shut trip can be configured to trip if a overvoltage
condition occurs instead of over current. Even if a interlock door is
opened. I have a Heinemann that has extra coils that sense the current while
the contacts only open or close the circuit without regard to actual current
through contacts.Think it is called hydraulic, but I would bet there is no
oil.. Just another $0.01 worthless.. 73 Mike

Bi-metal is very interesting stuff. Since all metals have a different
thermal coefficient of expansion, two metals of different types bonded
together will curl when it gets hot or cold.Makes dandy breakers, and

----- Original Message ----- 
From: "John Lawson" <jpl15 at panix.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Monday, December 04, 2006 12:40 PM
Subject: Re: [AMRadio] Breaker Info

> On Mon, 4 Dec 2006, Jack Schmidling wrote:
> > I need some help understanding the main power switch on my powersupply.
> >
>    Here is some info on current (no pun intended) Hienemann/Eaton
brakers -
> http://www.circuitbreakersinc.com/cirguide.pdf
> it's possible you have one of the "dual-rating" devices - with two
> different ranges that will trip the breaker.
>    The diagrams show 38 different configs - a bit more tracing and/or
> voltmeter work might narrow this down some.
>    Cheers
> John
> DM90fg
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