Is It essential to use the external neutral sensor TCE with Micro logic trip unit "6" for Masterpact ACB of types NT and NW ?

Kindly be informed that the external neutral sensor of type "TCE" is essential to be used with Masterpact ACB of types NT or NW in Micrologic trip unit "6" if the CB is of 3 poles

while it is not used if the NT or NW ACB is 4 poles

Released for:Schneider Electric Saudi Arabia