An installation for equipping DIN rails, according to an order, with components, including at least one of terminal blocks, electrical devices, and end holders, that are intended to be subsequently installed in switch cabinets, includes at least one main cell. The at least one main cell includes at least one supply unit for supplying the components to be fitted; at least one supply unit for supplying DIN rails, the DIN rail being equipped with the components in the main cell; and a writing, device designed to wirelessly transmit data, in order for said data to be saved, to a memory unit that is arranged on each DIN rail equipped with components and has an integrated wireless communications interface, the data containing order-specific information.

A support rail for luminaires or electrical units (60) has a support rail profile (50), which encloses an elongated receiving space, along with at least one busbar (55), arranged in the receiving space, with contactable conductors (58), wherein the support rail (50) further has, on its outside, display means (10) for visually representing the function of the conductors (58).

A terminal block marker designed to identify a terminal block. The terminal block marker includes a rigid base and a flexible film insert. The rigid base includes a top with a first arm having a first inwardly extending projection and a second arm having a second inwardly extending projection. The rigid base also includes a bottom with legs extending in a direction opposite the arms to hold the terminal block marker in the terminal block. A flexible film insert with identification markings is installed on the rigid base. The flexible film insert is positioned under a first projection of the first arm and rotated downward until the flexible film insert snaps under the second projection of the second arm. The first and second projections retain the flexible film insert on the rigid base to form the terminal block marker.

A terminal block assembly is provided, comprising a plurality of terminal blocks mounted on a common horizontal support member, including a supply terminal block connected with a voltage source, and a plurality of distribution terminal blocks connected with a plurality of loads, respectively, characterized in that the length and height dimensions of the terminal blocks are the same, but the width of the supply terminal block is greater than that of the distribution terminal blocks, and that the supply conductor contact arrangements of the supply terminal block are designed for connection with a supply conductor having a relatively large cross-sectional area, while the distribution conductor contact arrangements of the distribution terminal blocks are designed for connection with distribution conductors having a relatively small cross-sectional area. A conductive comb member extends transversely across the assembly to interconnect the electrical circuitry contained within the terminal block housings.