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CB polarity?

 
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johnbright



Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA

PostPosted: Sun Apr 17, 2022 6:08 pm    Post subject: CB polarity? Reply with quote

I’m not using this type of breaker but curious… why is it marked for polarity?

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user9253



Joined: 28 Mar 2008
Posts: 1906
Location: Riley TWP Michigan

PostPosted: Sun Apr 17, 2022 6:57 pm    Post subject: Re: CB polarity? Reply with quote

Since the circuit breaker is rated for AC, polarity doesn't matter.
Only the Chinese know the answer to your question about the LINE and LOAD labels.


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PostPosted: Mon Apr 18, 2022 9:54 am    Post subject: CB polarity? Reply with quote

At 09:08 PM 4/17/2022, you wrote:
Quote:
--> AeroElectric-List message posted by: "johnbright" <john_s_bright(at)yahoo.com>

I'm not using this type of breaker but curious… why is it marked for polarity?

There is a constellation of reasons for marking
the input and output connections for breakers,
switches and relays. On of many explanations can
be found here:

https://tinyurl.com/y5zge76c

Standardization specs call for marking terminals
on such devices if it 'makes a difference'. Instances
where it does make a difference includes specialy
breakers with internal features beyond the
rudimentary need to protect a wire from fault
damage.

A manufacturer can choose not to mark inputs and
outputs if their device doesn't care . . . or if
they want to avoid a qualification test that
demonstrates tolerance to a reversed flow.

In small breakers typical of applications
in aviation, the LINE/LOAD labels would be
significant only if there's a third terminal
common to specialized electronics inside the
breaker (soft fault detection, remote trip,
etc).





Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


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