Device carrier insert with integrated universal three-phase power rail with Dali (usable length 680 mm) made of galvanized, profiled sheet steel for combining accent and general lighting, surface coated with polyester resin paint, with two twist locks for quick insertion into the support rail. Heat-resistant cables including fixed 7-pin quick-assembly plug with tool-free phase preselection and locator finger. Suitable for luminaires with 3-phase power switch adapter (ET) from Regiolux, Global Trac, Eutrac, Iguzzini, Ivela, Powergear, Reggiani, Targetti, Zumtobel and 5-phase power switch adapter (DALI) from Regiolux, Global Trac.