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What is the difference between standard and Mission Critical (W) Micrologic trip units?

Product Line:
Powerpact H, J, L with Micrologic trip units

The trip curves and adjustments for the standard and W trip units are the same.  The difference is that the W trip units have been modified to delay longer before tripping (though still within the curve) in order to provide more withstand capability and coordinate with downstream breakers at higher fault levels.
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