Screw fittings with accessories

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Screw Connectors with Accessories

Electrical connectors are a large group of fittings used in electrical installations to connect sections of wires by screwing (screw connectors), as well as snapping (spring connectors) the ends of wires in the current path of connectors.

Taking into account the function of connectors in electrical engineering, we can divide them into installation connectors, i.e. used for connecting directly in the installation, and terminal blocks, used in electrical switching stations, as well as in control cabinets and rack cabinets. While the installation connectors can be mounted using a screwdriver, or completely without the help of tools, and they do not require the use of additional elements, a number of accessories are helpful in the installation of terminal blocks, allowing the creation of complete sets.

Bolt & Accessories - Plumbing & Bar Fittings

Screw connectors are the most traditional solution in connection technology. They are an alternative to compression connectors and despite the fact that they are more time consuming to install and require the use of a screwdriver, they are still widely used in the electrical industry.

Installation screw connectors

Installation screw connectors, so called. A screw terminal block is a small plastic component which allows wires to be easily connected together in connectors, junction boxes or splitters. There are connectors available on the market with a specific number of tracks (e.g. 2, 3, 5), as well as connectors in the form of so-called 12-track, which allow for easy division of strips with the use of an assembler's knife according to the current needs. Many manufacturers offer lighting connectors designed specifically for making connections in lighting fixtures, as well as floor installation connectors, which allow for more complex connections.

Connecting in installation cubes is carried out with small screws - in the holes of current armature, after partial removal of screws, the ends of wires are inserted and tightened to form an electrical connection.

Screw terminal blocks

Terminal blocks are used in switchgear and control cabinets. They are usually designed for mounting on a TH 35 rail and thanks to their use, both assembly, connection and extension of the switchboard become much easier and require much less time. In addition, they allow you to save space and bring order and clarity to the connections in the cabinet. Available on the market screw terminal blocks can be divided in terms of their application and distinguished, among others, connectors:

  • separating, which are used for simple connection and disconnection,

  • separating,

  • through,

  • fuses - together with fuse sockets are used for protection of circuits,

  • grounding

  • bunkers - save space in the enclosure due to the possibility of two-level assembly,

  • railless - designed for mounting on the plate.

Accessories for screw connectors

When installed in electrical switchboards and control cabinets, screw terminal blocks with accessories form complete sets for the relevant applications. Some of the most common items to help create connections using strips are:

edge plates (end walls), i.e. thin sheets of properly profiled plastic, matched in terms of shape, type of fastening and material parameters to the specific type of terminal blocks of a given manufacturer,

baffles - similar to endplates, but used to separate groups of current paths of terminal blocks,

Holders (end blocks) - similarly to terminal blocks they are used for terminating terminal blocks, however they are mounted to TH35 rail and thus they have both masking and supporting function,

jumpers - are used for electrical connection of terminals. Thanks to them it is possible to achieve almost unlimited number of connections, thanks to the possibility to break the chosen ending and thus skip a specific current path,

connector markers - are used for addressing circuits and are usually made of insulating material, with or without ready-to-use print, e.g. for marking with a marker.

The above examples of connector accessories do not exhaust the entire available range, but they are among the most popular and most used by electricians.