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    What do the indication lights on the Micrologic trip units mean?

    Trip indicator lights on Micrologic

    Product Line:
    Circuit Breakers

    3-Phase, 600V, P and R and Masterpact Breakers with Micrologic Trip Units


    The Ir long-time pickup level was exceeded.

    Isd/ Ii:  The Isd short-time pickup or the Ii instantaneous pickup was exceeded.

    Ig:   The Ig ground fault pickup was exceeded.

    Ap:   The self-protection indicator light (D) lights when the trip unit causes the breaker to trip
    for a reason other than an overcurrent on the Ir, Ii, Isd, or Ig functions. 
    The Ap light can indicate:
    * issue with internal current sensors, usually moisture or corrosion
    * instantaneous override level is exceeded
    * fail-safe protection for circuit in case of trip unit malfunction
    * trip unit temperature approaches 90 deg. C
    * overvoltage on 24 Vdc inputs F1-F2

    Related Links
    FA FA176046: Determining the cause of breaker tripping with Ap light indication on the Micrologic trip unit
    Instuction Bulletin 48049-136-05:  Micrologic 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units


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