Busbar support space unit/N for distribution system EP, 60 mm system, rated operational current Ie=630A, poles=1, can be used for 30x5/10, thermoplastic, silicon free, chlorine free, halogen free, distance between busbar supports corresponding to the distribution board's short-circuit strength diagram, expandable to 4- and 5-poles by inserting into the 3-pole SL6303 clamp