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Please note that if the current exeeds the pick up current, the non tripping time is the time of the micrologic unit that will not respond below it
i.e , if we have a fault current value which exceeds the pick up current so the micrologic trip unit will not be able to respond in a duration less than the non tripping time.
but to be noted that in case of reflex tripping , the breaker mechanism will takes the protection action
Please check the attached PDF from the glossary of the NSX MCCB which explains this .