Earthing terminals – find manufacturers and suppliers

Earthing terminals - also known as PE terminals (Protective Earth) - are essential for the protection of people and devices, as they dissipate fault currents in a targeted manner and thus prevent electric shocks or fires.

Earthing terminals are used wherever metallic housings, protective conductors or conductive components need to be earthed - whether in building construction, switch cabinets, machines or power distribution.

Below you will find the functionality, use and areas of application of earthing terminals as well as their advantages:

How earthing terminals work:

The basic function of an earthing terminal is to establish an electrically conductive connection between a protective earth conductor (PE) and an earthed structure - usually an earthed metal enclosure or a mounting rail. This connection must be permanent, low-resistance, mechanically stable and, above all, safe.

In contrast to normal terminals, which are housed in an insulated enclosure, earthing terminals have an electrically conductive connection to their mounting structure (e.g. the top-hat rail in the switch cabinet).
This is usually achieved by direct metal contact via a snap or screw connection to the mounting rail.
Clamping technology such as screw, spring or push-in connection to safely accommodate the protective conductor.
As soon as a protective conductor is inserted into the terminal, it conducts the current to earth via the mounting rail and the earthing system in the event of a fault, which triggers protective mechanisms such as fuses or residual current circuit breakers.

In order to allow clear identification as an earthing terminal in accordance with international standards, earthing terminals usually have a green/yellow color coding.

Use and areas of application of earthing terminals:

1. Building services engineering:
In building installations, earthing clamps are used to connect the protective conductor to equipotential bonding rails, earthing conductors or metal installation components such as pipes, housings or support structures. They are also essential for lightning protection systems.

2. Switch cabinet construction and industrial automation:
In switch cabinets, earthing terminals are mounted on DIN mounting rails to connect all PE cables centrally. They are used to safely connect the PE conductor of each connected device or module to the switch cabinet's earth potential.

3. Mechanical and plant engineering:
In machines, all conductive housing parts, motors and metallic components are earthed via earthing terminals to eliminate any risk in the event of insulation faults.

4. Photovoltaic and energy technology:
Reliable earthing is vital in PV systems, transformer stations and distribution boards - here, earthing terminals safely discharge fault currents, overvoltages or lightning currents.

5. Vehicle and railroad technology:
Special, vibration-proof earthing clamps are also used in mobile systems such as trains or commercial vehicles to earth body parts and power systems in accordance with standards.

Advantages of earthing terminals:

• High level of safety because fault currents are discharged quickly and in a targeted manner.
• Space is saved on the DIN rail, especially with terminal blocks.
• Spring-loaded and push-in terminals enable tool-free connection.
• clear arrangement of all PE cables in the switch cabinet.
• Mechanically robust design, vibration-proof, corrosion-protected.

Earthing terminals are key components in any electrical system when it comes to protection and safety. They ensure the safe discharge of residual currents and fulfill an important function in the protection concept of electrical systems. Whether in the switch cabinet, in the building or in complex machine systems - the correct selection and installation of earthing terminals is essential for safe operation and the protection of people and property.

Here you will find an overview of the most important criteria that you should pay attention to when purchasing earthing terminals:

When purchasing earthing terminals- for example for the electrical trade, industry, supply systems or plant construction - there are numerous technical, qualitative and economic factors to consider. A well-founded selection ensures that the clamps meet the requirements of the project and can be used reliably and safely.

• First of all, it must be precisely determined where and how the earthing terminal is to be used.
• Factors such as control cabinet construction, machine installation, building installation, railroad technology or outdoor use play a role here.
• Depending on the application, the requirements for design, size, load capacity and degree of protection differ significantly.
• The earthing terminal must be approved for the required conductor cross-section. It is important to check whether solid, stranded or fine-stranded conductors are used.
• The use of wire end ferrules also influences compatibility with certain terminal types, especially with push-in or spring terminals.
• The terminal should cover as wide a range as possible in order to be flexible in use.
• There are various clamping technologies such as screw terminals, spring-loaded terminals or push-in terminals.
• For industrial applications with frequent maintenance, screw terminals are reliable but require more maintenance.
• Push-in or spring-loaded terminals are suitable for time-saving and vibration-proof installations, as they require no tools and are maintenance-free. The clamping technology must be suitable for the planned working environment and installation conditions.
• Earthing terminals must comply with special regulations as they are part of the protective conductor system.
• Compliance with the DIN EN 60947-7-2 standard (for protective conductor terminals) and VDE directives is particularly important.
• The terminal must make reliable, permanently conductive contact with the earthed mounting rail. Only standard-compliant terminals may be used in safety-relevant circuits.
• The material used must be durable and corrosion-resistant, especially in industrial installations, outdoors or in high humidity.
• High-quality metals with tin-plated or nickel-plated surfaces and housings made of halogen-free, flame-retardant plastic ensure safe operation even under demanding environmental conditions.
• Depending on the place of use, the degree of protection against dust and moisture is crucial. In control cabinets, IP20 is often sufficient; outdoors or in harsh environments, IP65 or higher may be required.
• The terminal block must also be designed for the required operating temperature range - for example, when used in machines or photovoltaic systems where temperature fluctuations can occur.
• Earthing terminals are usually mounted on DIN mounting rails, especially in control cabinets. It is therefore important to ensure compatibility with the mounting rail (e.g. TS 35). It must also be ensured that the terminal automatically makes conductive contact with the rail during installation - this is usually done using special contact springs or claw elements.
• Professional applications require clear, standard-compliant labeling. Earthing clamps are marked green and yellow in accordance with the standard. It should also be possible to apply markings or labels to make the wiring in the switch cabinet clear and easy to maintain.
• For international projects or safety-relevant systems in particular, products should have appropriate certificates - such as UL, VDE, CE, IEC or ENEC. These provide proof of independent testing and conformity to standards. Such certificates are also frequently required in project tenders.
• In addition to the technical requirements, economic aspects also play a major role.
• The terminal should not only be of high quality, but also available at reasonable conditions.
• Short delivery times, stable supply chains and the ability to procure larger quantities promptly are often crucial for project processes.
• Aspects such as packaging units, shelf life and reusability also influence cost-effectiveness.

When purchasing earthing terminals, it's not just about the right product, but also about a coordinated interplay of safety, compliance with standards, ease of installation and cost-effectiveness. Only careful selection can ensure that the terminal provides reliable protection in the event of a fault, can withstand operational requirements in the long term and can be integrated smoothly into the overall system.

Earthing terminals can be obtained from various suppliers. You will find comprehensive information on manufacturers and suppliers of Earthing terminals around the world on Exportpages.