unibar M, 400A, center feed with cable grommet (for multi-conductor cables). Center feed box for installation on a 5-pole busbar system for a type-tested low-voltage switchgear assembly in accordance with IEC/EN 61439-1 and -6. Feed box consisting of sheet steel housing (galvanized and painted), busbars, cable bushings and connection bolts. In the feed box, the connecting cables are connected to the busbars using connection bolts. Note: The center feed boxes can be used upright or flat. The position of the PE rail can be changed.