Complete and pre-assembled Terminal Block set for quick wiring of building circuits of an RCD potential in a distribution board, without normative requirements for N separation. The set enables the connection of all building circuits in accordance with DIN 18015 on a DIN rail and also offers reserve capacity for additional connections or future Expansion. Also suitable an extension to set no. 821-180. N and protective conductor distributions (insulated from the DIN rail) with a total of 10 (up to 6 mm²) outputs for connecting the building circuits. Pre-assembled accessories and pre-printed marking for quick and clear installation with clear potential and connection point assignment.