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Thread: Breaker Fire Reverse Polarity

  1. #1
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    Breaker Fire Reverse Polarity

    Why would reverse polarity do this? What makes a DC breaker need + & -?



    https://www.youtube.com/watch?v=Cup5fMGaE2g
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    Probably for the same reason a switch is sometimes marked. A magnet is used to help extinguish the arc.
    Advise is a dangerous gift, even from the wise to the wise.

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    Quote Originally Posted by SG-1 View Post
    Probably for the same reason a switch is sometimes marked. A magnet is used to help extinguish the arc.
    Physics? Anyone have pics of the internals?
    I'm in over my head...

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    Quote Originally Posted by mbrooke View Post
    Physics? Anyone have pics of the internals?
    The individual charge carriers in an electric arc immersed in a magnetic field perpendicular to the plane of the arc will be moved by magnetic forces in one direction (perpendicular to both current path and field lines). If that direction is toward an open area (arc chute?) which allows the arc to lengthen and become easier to extinguish, an arc with the opposite current flow will be pushed in the opposite direction (possibly against a supporting surface which will keep the arc from lengthening.)

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    Quote Originally Posted by GoldDigger View Post
    The individual charge carriers in an electric arc immersed in a magnetic field perpendicular to the plane of the arc will be moved by magnetic forces in one direction (perpendicular to both current path and field lines). If that direction is toward an open area (arc chute?) which allows the arc to lengthen and become easier to extinguish, an arc with the opposite current flow will be pushed in the opposite direction (possibly against a supporting surface which will keep the arc from lengthening.)
    Had not thought about it that way- makes sense.
    I'm in over my head...

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