The Importance of the Connection Terminal in Electrical Installations

To perform electrical connections within a junction box or a flush-mounted box, specific hardware is required. This may include an electrical terminal block or a connection terminal, also known as a terminal block or a Wago connector. What is the difference between the two? Are there several different types of connection terminals?

What equipment should be used for electrical connections?

Before the advent of terminal blocks, electrical connectors (commonly known as “dominoes”) were systematically used to connect conductors within the same circuit. These connectors can accommodate wires with a cross-section of up to 25mm². However, a single connector cannot accommodate wires of different cross-sections. To ensure a secure connection, each conductor must be screwed in, a process that can become time-consuming during large-scale installations. This also poses a risk to the long-term stability of the connections, as they may loosen over time. Another significant drawback of using electrical connectors is the issue of torque. If the screws are overtightened, there is a risk of breaking the wires; if they are insufficiently tightened, electrical arcing may occur.

The introduction of automatic connection terminals has revolutionized electrical wiring. Indeed, there is no longer a need for screwdrivers, the connection system operates via springs or levers. Simply insert the conductor. The same terminal can also accommodate different sections. However, a connection terminal cannot accommodate a section larger than 4 mm². For connecting cooktops, which require 6mm² conductors, the use of an electrical terminal block is therefore essential.

A connection terminal for every circuit type

The Wago brand has established itself as one of the leaders in the electrical connector market. To such an extent that’a connection terminal is commonly referred to as a Wago terminal. It offers various ranges to meet different electrical connection requirements. Consequently, a single connection terminal can accommodate only rigid wires, a mix of rigid and semi-rigid wires, or all wire types (rigid, semi-rigid, and flexible). Depending on the specific range, the supported amperage varies between 24A and 32A. Similarly, the maximum allowable voltage at the terminals can be 400V or 450V. To simplify the electrical installation process, Wago has also implemented a color-coding system for two of its ranges. The color of the connection terminal indicates its number of clamping points: 2, 3, 4, 5, or 8.

The size of a Wago terminal block also offers a significant advantage over a standard electrical connector. Electrical connections are less cramped and much easier to identify. To further optimize space within a junction box, Wago has developed miniature lever-operated terminal blocks.

The numerous advantages and the certification of self-service charging stations have democratized their use. An increasing number of professionals are now utilizing this type of connector when performing electrical installations.