Terminal blocks – U type terminals – screw terminal blocks
Terminal blocks (terminal blocks) are used in any work on the installation of wires and cables. Their purpose is to ensure the uninterrupted and safe operation of the entire circuit.
To achieve safety, special cases and junction boxes are used. Smooth operation is ensured through the use of terminal clamps - simple devices that even an inexperienced electrician can handle.
Terminal block types
Connecting blocks are divided into screw and spring (screwless) according to the type of conductor installation. Both types are manufactured in plastic, carbolite or nylon cases, which contain a contact group - a mechanism that connects the wires. The connection takes place using the metal part of the specified mechanism. This products for electrical work are marked with current and voltage limits.
In most cases, before using the terminal block to connect wires, it is necessary to complete the wire termination procedure, except for those conductors that have solid conductors.
Advantages of screw terminals
The efficient operation of the terminal blocks is manifested in the almost complete absence of losses and heating due to the following factors.
- The optimal combination of a pair of metals, i. E. the correct choice of metals from which the contact group will be made. Wires are often made of copper or aluminum. Accordingly, to ensure good contact with these metals, the contact block must be made of, for example, steel or brass.
- Absence of oxide on the surface of metal conductors due to the use of special lubricants. Although the use of lubricants is often neglected, some manufacturers, such as, for example, «Wago», provide for lubricants at the manufacturing stage or supply them in a set.
- Fixing the wire directly in the contact group due to the design of the Terminal blocks.
Assortment of the online store of industrial hardware RZ
On our site are presented indivisible screw clamps ZVI, with a fixed number of poles (12). Designed for conductors with a cross-section from 2.5 to 40 mm2, for currents from 3 to 150 A, voltage 400 V. The case is white, polyethylene. Packing of 10 pcs.
You can easily buy terminal blocks in Ukraine in bulk on the pages of our catalog. It is enough to send an application or contact the manager. We will deliver to any point in Ukraine. Thera are different payment methods.