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    A Masterpact NW or Powerpact P or R frame circuit breaker has gotten wet and is nuisance tripping; what should be done?

    Issue:
    Water damaged Masterpact and Powerpact breakers

    Product Line:
    Circuit Breakers

    Environment:
    Masterpact and Powerpact circuit breakers

    Cause:
    Circuit breakers may become wet for a variety of reasons including spray, rain, snow, condensation in outdoor enclosure, and begin nuisance tripping

    Resolution:
    Masterpact and Powerpact P and R breakers which have gotten wet are prone to nuisance tripping.  Water will interfere with normal operation of the current sensors, reporting more current to the trip unit than actually exists, resulting in tripping with Ir, Ii, Ig, Ap indication, or no indication.  Which function trips depends on the magnitude of phantom current reported to the trip unit. 
    It is also possible for water to compromise the trip unit causing nuisance tripping.
    Once a circuit breaker has become wet enough to nuisance trip, it cannot be restored to reliable operation and the recommendation of NEMA and of Schneider Electric is to replace the breaker.

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