The EZB250MCNS is a main connector from the Schneider Electric EasyPact range, part of the NS100...250 product family. It is rated at 250 A and designed to connect the main incomer to the busbar in a panel.
Schneider Electric has marked the EZB250MCNS as obsolete. No official successor order code exists.
This connector mates the incoming cable or bus to the busbar system inside an NS100...250 panel. The 250 A rating governs the maximum continuous current the connection can carry — sized for the main incomer position, not a branch circuit.