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Circuit breaker

  1. Jun 14, 2017 #1
    Why does a circuit breaker not show which terminal is IN and OUT?
  2. jcsd
  3. Jun 14, 2017 #2


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    Gold Member

    Because it's irrelevant. Circuit breakers have no polarity. That is, there IS no "in" and "out". You can hook it up either way.
  4. Jun 15, 2017 #3
    For AC breakers, yes.

    DC circuit breakers may have a polarity. Those that do oppose quenching and direct the arc into the switching mechanism rather than aid quenching, and point it into the arc chute when they are wired backwards.
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