Building block, universN, 300x250mm, empty, with transparent panel.univers N empty building block as a space reserve for setting up a low-voltage distribution as a switchgear combination up to 1600A, rated voltage 3AC 690 V /50Hz. Sealable contact protection covers as standard, reinforced using an internal gas pressure process with four quick-release bolts each. VDE mark approval in accordance with DIN EN 61 439 -1 and - 2 and -3 (VDE 0660 Part 600 -1 and -2 and -3), dimension standard: DIN 43 870.