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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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 Posted: Sun Apr 17, 2022 6:08 pm Post subject: CB polarity? |
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I’m not using this type of breaker but curious… why is it marked for polarity?
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_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sun Apr 17, 2022 6:57 pm Post subject: Re: CB polarity? |
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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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nuckolls.bob(at)aeroelect
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| Posted: Mon Apr 18, 2022 9:54 am Post subject: CB polarity? |
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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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