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What is the difference between the following trip units (TMD and TMG trip units) used with NSX MCCB (100-160 -250) A ?

For NSX MCCB with ratings 100/160/250 A:

TMD: it is a thermal magnetic trip unit used for distribution networks (D: Distribution)

TMG: it is a thermal magnetic trip unit used for Generation plants (it has extra different protection functions for generation phase that are not found in TMD)
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