A supporting rail is a structural shape made of out metal which is generally used in electrical engineering in order to adjust components in distribution cabinets, control cubicles, connection cabinets and other similar products. Several electronic operating funds such as relays, impulse switches, time-switch clocks or automatic cutouts can be shelved on sideways or mounted and arrested from the font. These mounting possibilities enable simple wiring within a row or between several rows.

Steel, copper and aluminium are used to produce them. In addition to their holding function, supporting rails made out of copper or aluminium can be applied as protective earth conductors. Steel is due to its characteristics a bad conductor and inapplicable for this function.

DIN-mounting rails are supporting rails with a U-shaped respectively hatlike profile.

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