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Thanks for the info Mark. It had already been noted that the vigi unit was fully adjustable (time delay & trip current) but the setting dial was indicating that no time delay had been set on the unit. Oddly thou when testing with the 1720 in RCD time delay mode a trip time was recorded. I...

When testing the trip times on a merlin MCCB 100mA vigi-unit. The instrument dosn't record the disconnection times just simply displays a trip message. Anyboby have a similar issue or can shed any light on the problem?