Masterpact M16H1 ACB, with STR38S Trip Unit. In=1600A.
I'm aware that the trip unit may not function correctly while detecting currents below 20% of rated current. But my specific question is, could these conditions while causing the STR38S Trip Unit to malfunction, actually cause the unit to trip. As an example, chosen settings Io x In x Ir = approx. 1414A. With average amps per phase at approx. 80A, it is accepted that the Trip Unit may not follow the current/time curve settings. But could these conditions contribute to the unit tripping?

Malfunctioning of processor. Local heating if any to be detected... recommended before replacing.

Should be refreshed the unit. The new version soft can solved the Malfunction.