Push-in fittings

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Push-in Fittings

Modern electrical installation is based on fast assembly elements. These include quick installation couplings, especially press couplings. They enable simple and fast connection of electrical wires with different cross-sections. Unlike traditional screw connectors, the clamping element in push-in connectors is a lever or a spring. It presses the wire and permanently connects electrical circuits. Push-in connectors make it possible to connect all types of cables, from stranded, single or multi-stranded, and with sleeve endings. An important aspect of using this type of connection is lowering the cost of installation connected with the possibility of multiple use of push-on connectors.

Wago - the standard in modern electrical installation

The company Wago has developed and introduced a modern system of connecting electrical cables several decades ago. The snap-in and push-in connection systems allow multiple and fast cable connections in installation boxes, on mounting strips with the help of accessory installation bases or directly in electrical distributors and at the equipment itself. The installation of a cable is done only by removing a part of the insulation on the appropriate section of the cable end, which is usually 10 to 12 millimeters, and pressing it into the connector socket.

Electrical connector design

Typical push-in connectors have between two and five sockets and can also come in two-track variants. The row of sockets has an opening for inserting the test probe of an electrical measuring device. This allows to check the proper functioning of the installation and to measure the current value, without the necessity of dismantling the installation. Press connectors usually have transparent body, which allows to visually check the state of cable connection and to evaluate the correctness of its fixing. Push-in connectors usually have bridging elements made of silver-coated copper. Due to the mechanism of holding the cable, push-in connectors can be divided into two categories:

  • spring clamp connector where the wire holding element is a spring inside the socket. The whole mechanism is inside, which reduces its size and influences the ergonomics of the installations. This type of connector allows to disconnect the cabling after it is rotated and pulled out a few times. So it is possible to adjust the length of the cabling at any time. At the same time the mechanism is strong enough to hold the cable firmly and resistant to accidental disconnection. The spring loaded push-in connectors allow secure connection of wire type cables with cross-sections from 0.5mm2 to 2.5mm2. Connecting wires is not possible with this type of connectors. Available in 2, 3, 4, 5 and 8 hole versions.

The + lever crimp connector has a reusable external latching mechanism. It allows connection of both wire and cable construction. Cable diameters range between 0.08 mm2 and 4 mm2. Their limitation is just this maximum wire size. Wago universal connectors have an arrangement from 2 through 3 to 5 holes. Each of them also has a hole for measuring and controlling the current flow in the individual terminals.

Push-on connectors are made of thermoplastic material resistant to temperatures up to 105 degrees Celsius. Their construction allows to conduct direct or alternating current in appropriate ranges for a given group of products. The current characteristics of Wago 221 series universal connectors allows for using them in installations with the rated current up to 32A and value up to 450V.

Other compression connectors

There are also various types of devices available on the market with a push-in wire connection system. These are installation push-on connectors for indoor connections and industrial electrical line construction. Universal lighting connectors are used for lighting installation. They can be used for connecting control circuits of light sources and shutter drives in all types of electrical lines. They have one or two connection sockets. They do not require any additional tools and the cable is fixed with a spring clip. For applications in connecting cables of smaller cross-sections, micro series connectors are used, usually available with the number of outputs from 2 to 8. There is also another group of service connectors for connecting damaged and interrupted electrical cables. This makes it possible to repair by re-connecting cables with cross-sections from 0.5 mm2 - 2.5 mm2.