This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
For ACB either NT or NW, in case the ACB is motorized, it is a must to have the opening and closing coils that take the stored energy in the springs of the CB and convert it to required mechanical force to hit the contacts during opening or closing
So it is a must to have both XF and MX (closing and opening coils) with Motorized ACB NT or NW .