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    What is the function of an SDX switch?


    Issue:
    What is the function of the SDX relay module for Powerpact H J and L circuit breakers?

    Product Line:
    Powerpact H, J, and L circuit breakers with advanced Micrologic trip units

    Resolution:

    Circuit breakers equipped with Micrologic 3, 5, and 6 trip units can take the optional SDx Module.
    The SDx Module receives data from the trip unit through a fiber optic link.

    Default alarms are as follows
    • Micrologic 5 trip unit:
    — Output 1 is the thermal fault indication (SDT).
    — Output 2 is the long-time pre-alarm (PAL Ir).
    • Micrologic 6 trip unit:
    — Output 1 is the thermal fault indication (SDT) for electrical distribution applications.
    — Output 1 is None for motor-feeder applications.
    — Output 2 is the ground-fault indication (SDG).
    • For Micrologic 3 trip units, the SDx is nonconfigurable and indicates thermal trip alarm

    • For Micrologic 5 and 6, SDx can be configured for different alarms.
    Note that the SDX can be used for ground fault alarm on non configurable 6 (LSIG) trip units, but it will not provide ground fault alarm on a Micrologic 5 (LSI) trip unit.  Therfore, GF alarm without tripping is not possible.
    All alarms on a trip, failure, and maintenance event and all alarms associated with a measurement previously activated in the Alarms tab can be assigned to an SDx Module output.
     For complete list, refer to Alarms section of  manual 48940-312-01.
    To set alarms, access the SDx Module output settings using the RSU software under the Output tab.

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