Support rail made of steel + polymer, support rail made of profiled, torsion-resistant sheet steel, pre-galvanized, blind cover and rail connector for SRT quick assembly system module length /500, feed-out via plug and cable with 2-way plug-in connection terminals 11x1.5-2.5mm², suitable for connecting flexible and rigid supply cables as a central feed with feed-in adapter SRTA-7E, the support rails are connected with screwless, self-locking quick connector SRTV by simply pushing it into the rail, or with the detachable connector SRTVL by pushing it in and locking it by screwing. The connection between two rails is made without tools using a built-in plug-in coupling, five-, seven- or eleven-pin. Support rail made of profiled, torsion-resistant sheet steel, pre-galvanized, blank cover and rail connector for SRT quick assembly system module length /500, feed-out via plug and cable with 2-way plug-in connection terminals 11x1.5-2.5mm², for connecting flexible and rigid supply cables as a center feed with feed-in adapter SRTA-7E suitable for SRT.