These components for wiring circuit breakers in industrial, commercial and private electrical distribution boards significantly reduce the installation effort. The connecting rails are suitable for the three-pole connection between distribution board rows on the supply side. They are available for mounting rail spacings of 125 mm and 150 mm. Properties: connects two residual current circuit breakers from the DFS series installed one above the other on mounting rails, significant time savings during wiring, type of installation: the rails are plugged into the upper or lower connection terminals of the devices to be connected. Areas of application: connecting rails in this series are used in conjunction with RCCBs in power supplies for residential and commercial buildings as well as industrial plants.