Connection unit without equipment for mounting on a TH35 mounting rail in accordance with DIN EN 60715, for a single module in keystone design, cable access variable at 45° from above or below, plug-in direction inclined 45° downwards, the width of 1TE enables the installation of up to 12 REGs in standard electrical distributors, when installed as a device of protection class I, the potential equalization takes place via an integrated potential equalization plate directly above the mounting rail. The mounting rail must be integrated into the building potential equalization using appropriate measures. The device is protected against direct contact by a cover. When installed in protectively insulated distributors, protection class II is therefore maintained. For this, the equipotential bonding plate must be removed., integrated dust protection flap (also available in color), suitable modules for cable access 45° from above: C6, Amodul K 180°, E-DAT module coupling 180°, UTP module Cat.5e and Cat.6, suitable modules for cable access 45° from below: C6Amodul K 270°, not suitable for modules in modular design and C6, Amodul K 90°!