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

Product Line:
Circuit Breakers
Trip Units (STR)

Electrical Distribution Equipment

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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