The busbars are designed for our DAFDD 1 arc fault detection devices (fire protection switches, AFDD). The third module width of each bar was given a recess for the AFD unit for this purpose. The fork-shaped bars are available in two-terminal and two-terminal-pair designs. The bars establish a quick supply-side connection under the devices and are available in two lengths. They are ready to use immediately in 12 module width units and do not need further modification. They offer space for a total of four DAFDD 1 devices. The busbars which can be cut to length are 60 module width units long and offer space for up to 20 DAFDD 1 devices. They can be shortened to the required length as needed. The open ends of the cut bar are then covered with our 'EK' end caps. Suitable for all bars, the 'EV-S BS' protective caps can be used to cover connections which are not in use. The bars offer an overview of the wiring and provide significant time and cost savings.