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    What is the difference between the STR28D and STR28DP trip units for the MP Masterpact breaker?

    Product Line:
    Circuit Breakers
    Masterpact
    Trip Units (STR)

    Environment:
    Electrical Distribution Equipment

    Resolution:
    The D trip unit has an Io and Ir dial which together set the rated current of the breaker.
    The DP trip unit has a rating plug (ratings from 50% to 100% of the sensor rating) which together with the Ir dial set the rated current.

    STR28D (long-time = 0.4x1 sensor rating)

    STR28DP (long-time = 0.8x1 plug rating)
     

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