Is it required to remove the rating plug in Micrologic E of Masterpact NW/NT & Compact NS 630b … 1600 A circuit breakers while performing megger test.
The Micrologic E has a different technology than that of Micrologic A, P and H.
The Micrologic E measures the voltage through a high impedance input and that input has a high dielectric withstand,
so it is not required to take off the rating plug while performing a megger (isolation / dielectric) test.
The Micrologic P, H and 7.0A take line voltage to power the trip unit, so they use a low-impedance and low dielectric withstand
input to take power and in this case it is required to take out the rating plug while performing a megger (insulation) test.