Busbar connection kit, 1-pole, 185mm busbar system, cabinet-cabinet . (Horizontal N-housing) . 630 A, for 30 x 10mm Cu. Height 3. Rated current (A) 630 (573) . PU 1. Copper bars. Pre-assembled copper bars in the sizes . 12 x 5, 20 x 5, 30 x 5, 12 x 10, 20 x 10, 30 x 10mm in the following variants:. Horizontal design: . Field width. Extended on one side (perforated from 20/30mm copper). Extended on both sides (perforated from 20/30mm copper). Shortened field width. Vertical design in field height.