Signal output, visual status display Can be connected in parallel or in series Self-cooling via natural convection when installed in a horizontal position Connection technology with direct plugin technology and tool-free lever operation Galvanically isolated output voltage (SELV/PELV) in accordance with EN 61010/UL 61010 Label holder (2789-1233, not included) for WAGO labelling cards (WMB) and WAGO labelling strips