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    Can a Micrologic Series B trip unit be changed or replaced?

    Issue:
    Can a Micrologic series B (or older) trip unit on a legacy breaker be replaced, changed, or upgraded in the field?

    Product Line:
    LX, LXI, LE, MX, ME, NX, NE, PX, PE, and SE circuit breaker frames

    Environment:
    Electrical Distribution Systems

    Cause:
    Need to add ground fault sensing to existing breaker or replace bad trip unit

    Resolution:
    The SE trip units can be changed by Field Services (see Supplemental Digest for availability).  
    The ground fault function cannot be added to or deleted from an SE breaker.
    A replacement trip unit may be installed ONLY in the breaker it is identified for.

    The other breakers with Micrologic Series B and earlier trip units CANNOT be replaced.  These include LE, LX, LXI, ME, MX, NE, NX, PE, and PX type breakers.

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