Connection Terminals

Electrical terminals: complete guide to choosing and installing your connection equipment

An electrical terminal block greatly simplifies the wiring of your electrical panel. It combines several connection points in a single modular device. This design facilitates maintenance and reduces the risk of connection errors. Your installation gains in reliability and clarity.

The terminals incorporate automatic spring clamping systems. These mechanisms maintain constant pressure on the conductors. They eliminate loosening due to vibrations or temperature variations. This innovation guarantees a durable connection without additional maintenance. There are also screw terminals that offer a proven and economical solution. They allow for precise manual tightening and adapt to all types of conductors. Their maintenance remains simple: periodic tightening checks are sufficient to maintain connection quality.

Electrical professionals prefer terminals for their quick installation. They can be mounted on a standard DIN rail in a matter of seconds. This efficiency significantly reduces construction time.

How does an electrical terminal block work?

The operating principle of an electrical terminal is based on secure multiple connections. Each terminal accommodates a conductor, which it holds in place by mechanical clamping or a spring. The current then flows through the metal body of the terminal block to all connections.

The spring connection system has revolutionised modern terminals. It exerts constant clamping force without manual intervention for rigid wire and with a small flat screwdriver for flexible wire. This automatic pressure adapts to dimensional variations in the conductors. Connections remain perfect even after numerous thermal cycles.

The electrical conductivity of the terminal block depends on the quality of its internal materials. The best models use electrolytic copper or high-conductivity alloys. These materials minimise energy loss and heating. Your installation maintains its optimal performance over time.

What is the difference between a terminal and a terminal block?

An electrical terminal is an individual connection point for a single conductor or several conductors. Its sole function is to clamp and hold the cable in place. Its capacity is limited to a simple input-output connection. It is ideal for one-off connections.

The electrical terminal block combines several terminals in an integrated modular device. It forms a junction block capable of handling multiple connections simultaneously. This design allows a signal to be distributed to several outputs. It optimises the organisation of your electrical panel.

The individual terminal requires a dedicated space for each connection in the panel. The terminal block concentrates several functions in a small space. This optimisation frees up space for other protective equipment. Your panel becomes more compact and easier to read.

The connection options also differ between these two solutions. The single terminal generally accepts cross-sections from 2.5 to 95 mm².

What are the different types of electrical terminals?

The phase terminal (grey terminal) distributes the active current to all circuits in the installation. Its black, grey or red colour makes it easy to identify according to conventions. It supports high currents thanks to its reinforced conductor cross-section. Its robust design guarantees long-term reliability.

The neutral terminal (blue) ensures that the current returns to the source of the electrical installation. Its blue colour strictly complies with international identification standards. It maintains the reference potential essential for the correct functioning of the circuits. The quality of its connection directly influences the stability of the installation.

The earth terminal (green/yellow) effectively protects users against insulation faults. Its green-yellow colour ensures immediate and error-free identification. It connects all metal masses to the main earth terminal. This connection forms the basis of your differential protection.

There are also specialised terminals (Reference LEG037480) that meet the specific needs of certain industrial installations. High-intensity models can handle currents of several hundred amps. Waterproof versions are suitable for harsh or outdoor environments. This diversity covers all your technical needs.

Choosing your electrical terminal block

The rated current is the fundamental criterion for selecting a suitable electrical terminal. It must exceed the maximum current of the circuit to be connected. This safety margin prevents excessive heating of the equipment. Your installation remains reliable in all conditions.

The conductor cross-section directly determines the size of the terminals required. Each model of connection terminal specifies precisely its range of compatible cross-sections. Compliance with these characteristics guarantees an optimal and durable connection. Always check this compatibility before placing your order.

The number of connections influences the choice of model and configuration. Accurately assess your current needs and anticipate possible future extensions. This preliminary analysis avoids costly modifications during subsequent upgrades.

Compatibility with your existing DIN rail greatly simplifies installation. Check that the mounting system corresponds exactly to your equipment. This compatibility ensures quick installation without any special adaptation. Your work will be carried out in the best possible conditions.

The quality of the connection system directly influences the durability of the installation. Spring technologies offer superior reliability to screw systems. They eliminate the need for preventive maintenance on connections. Your installation requires less intervention over time.

Our complete range of Phoenix, Legrand and Schneider electrical terminals meets all your technical needs. We offer the best brands with permanent stock for fast delivery. Our products comply with the most demanding standards while offering excellent value for money. Discover our selection now to optimise your electrical installations.