rails 200 as an electrical connection for energy distribution and the data bus the mounting direction of the bridging module is perpendicular to the plane spanned by the supporting profiled rails 200 the terminal block 500 as the clamping element fixes the entire system to a fixed point on the supporting profiled rail 200 in the x direction with this configuration the system structure can freely distend in the x direction from a fixed point such as for example upon a thermally induced longitudinal expansion the mechanical clamping of this fixed point is at the same time the central electrical grounding and connection to the supporting profiled rail of the system assembly fig3 shows a perspective view of a supporting profiled rail 200 with the bridging module 300 the bridging module 300 comprises the plug contacts and a module locking device 301 for latching the bridging module 300 onto the supporting profiled rail 200 when the bridging module 300 is being seated the bridging modules 300 are freely displaceable along the supporting profiled rail 200 after being latched on fig4 shows a further perspective view of the supporting profiled rail 200 with multiple bridging modules 300 the bridging modules 300 can be realized in different widths so that the bridging modules 300 dictate the distance between joined functional components 400 this spacing defines a ventilation channel between the functional components 400 which for example comprises a metallic housing upper part 421 1 as a heat sink fig5 shows a view of the supporting profiled rail 200 with multiple bridging modules 300 the bridging modules 300 are laterally displaceable in the.