Rail and installation fittings

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Fittings for skirting and installation

Connectors are small and uncomplicated passive elements for low and high voltage electrical installations. Their main function is to facilitate and speed up the work of fitters, as well as to save space in the switchboard or control cabinet and to organize the wiring inside it.

Terminal blocks and terminal blocks

Strip and installation fittings are elements used in low voltage electrical installations to connect the wires both inside the switchgear and control cabinets, as well as in installation boxes and distributors.

Bolt and compression type terminal blocks and terminal blocks

In terms of construction, two basic connector groups can be distinguished:

  • screw-type,

  • crimped.

Screw fittings are elements which in electrical installation technology are known almost from its birth, whereas compression fittings, although they can hardly be called a novelty, were introduced to the market relatively late, because only in 1951. They were created as a product of a family company Wago founded in the same year in one of the cities of North Rhine-Westphalia. Initially, they were not very popular among fitters, but as time went by, the ease and speed of joining made with them began to be appreciated.

In terms of construction, compression fittings can be divided into spring-loaded and self-locking elements. The former, known since their introduction on the market by Wago, require the spring to be pulled back in order to be able to insert the cable end into the gap between the contacts. Releasing the spring causes it to return to its original position, i.e. to clamp onto the cable end. This technology is called by the company the Cage clamp. In the second case, the connection is even easier - in the resting state the connectors remain in contact, while inserting the cable between them increases the distance between the contacts only to the distance necessary to properly hold the tip in the connector. This type of terminal, in turn, is the weighted Push-in Cage technology.

Purpose and application of installation connectors

Today, screw and terminal connectors are mainly realized as rail elements, to be mounted in switchboards and cabinets on the TH 35 rail or on the plate, as well as in the form of small "cubes", which inside the boxes or distributors allow the safe connection of wires. Installation box connectors and lighting connectors used for installation of ceiling luminaires and wall lamps take up relatively little space and guarantee good quality of connection. Among the connectors there are also floor connectors, which enable more complicated connections inside distributors or boxes.

Floor connectors - types and applications

Slat connectors are used in switchboards and control cabinets. Their role is to ensure quick and easy connections that take up as little space as possible in the electrical cabinet. In addition, slat connectors allow you to keep order in the switchgear. They are often provided with fields which are used for marking, thanks to which it is easy to identify specific circuits and, for example, their protections.

Depending on the company, the classification of terminal blocks can vary - usually manufacturers group terminal blocks according to their application, which to some extent enforces their construction. So we can distinguish for example:

  • separating connectors - used for simple disconnection and connection,

  • neutral-coupling connectors - to facilitate insulation testing,

  • feed-through connectors,

  • separating connectors,

  • fuse connectors - integrated with fuse sockets,

  • earthing connectors - mounted on the earthing bus, ensuring connection of conductors with the bus,

  • floor connectors - saving space in the enclosure due to two-level mounting,

  • connectors for sensors,

  • connectors for actuators,

  • terminal blocks for arrays,

  • rail-less terminal blocks - designed for mounting on the board.

The above division does not exhaust the available connector types on the market, of course, and is not the only possible one - the originator of the connectors, i.e. Wago groups its products, among others, depending on cable cross-sections into compact Cage connectors (towards miniaturization) and into Power Cage connectors (for large cross-sections - up to 185 mm2).