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Primary Transformer Circuit Breaker Tripping on in Rush

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    #16
    Originally posted by ATSman View Post
    Paul
    You said the tripping breaker is in a NF series panelboard.
    What is the breaker frame? EDB, EGB, EJB etc........?
    Can you remove the panel cover and take a closeup pic of breaker front?
    We need to find out if the inst (mag trip) setting is fixed or adjustable and
    what that value is.
    AKAIK all NF breakers have fixed magnetic trip.
    I live for today, I'm just a day behind.

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      #17
      Originally posted by kwired View Post
      AKAIK all NF breakers have fixed magnetic trip.
      Methinks @ATSman is asking what the circuit breaker interrupting ratings are. Type EDB has an interrupting rating of 18kA, EGB = 35kA and EJB = 65kA.

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        #18
        Originally posted by topgone View Post
        Methinks @ATSman is asking what the circuit breaker interrupting ratings are. Type EDB has an interrupting rating of 18kA, EGB = 35kA and EJB = 65kA.
        That is how much the breaker can interrupt and is supposed to not be destroyed in the process. Magnetic trip setting is what level does it trip at when there is a rapid rise as in a short circuit, ground fault, or when an inductive load is turned on and has a temporary surge of high current. I know it is not adjustable on the EDB breakers, don't know that I have ever seen EGB or EJB so don't know if they have field adjustable settings.
        I live for today, I'm just a day behind.

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