These components for wiring circuit breakers in industrial, commercial and private electrical distribution boards significantly reduce the installation effort. In the case of the busbars for arc fault protection devices (fire protection switches, AFDD) of the DAFDD 1 series, the third division unit was provided with a recess for the AFD unit. They are available in two- and four-pole versions and in two lengths that offer space for four or up to 20 DAFDD 1. The rails create a quick supply-side connection on the underside of the devices. Properties: can be used to connect arc fault protection devices (fire protection switches, AFDD) of the DAFDD 1 series, can be cut to length as required, great time savings when wiring, type of installation: the rails are plugged into the lower connection terminals of the devices to be connected. Areas of application: Busbars in this series are used in conjunction with DAFDD 1 in power supplies for residential and commercial buildings as well as industrial plants.