Carbon Brushes, Brush-Holders and Slip Ring Assemblies


As the world leader for carbon brushes, brush-holders and slip ring assemblies, Mersen's expertise is geared to serving expanding markets including renewable energy, helping them to achieve greater energy efficiency. A global company with 7,000 employees, we use their skills and passion to serve you in 60 manufacturing facilities distributed over 40 countries.

Mersen offers complete technical solutions for all wind or hydroelectric applications, including carbon brushes (graphite brushes), brush-holders, slip ring assemblies, power and signal transfer systems, and antistatic brushes.

Mersen's CG626 carbon grade (for wind turbine generators) is currently regarded as the benchmark around the world. CG626 graphite brushes ensure cool running and optimum performance in all environmental conditions; they are approved by most original equipment manufacturers (OEMs).

Carbon brushes to transmit electric current

Carbon brushes are used to transmit electrical currents from a static to a rotating part in a motor or generator. They can be made with one or more carbon blocks, and can come with one or more shunts / terminals.

When used in DC machines, these can ensure a spark-free commutation. In order to ensure that carbon brushes remain in contact with the slip ring assembly or commutator, a brush-holder is used.

Mersen has a diverse range of carbon brushes for motors generators and alternators, grounding devices, and current and signal transmission. These brushes are of the highest-quality and provide longevity to the user.

Mersen's service expertise means the company provides worldwide on-site maintenance, as well as:

  • Commutation expertise
  • Measurements and diagnostics
  • Support service on a daily basis
  • Technical assistance by phone

Brush-holders for electric machines

Mersen manufactures brush-holders for a range of applications, including brush-holders for new machines and replacement holders. The company also re-designs existing brush-holders.

Once a request has been made, Mersen will analyse the customer requirements and manufacture a customer-specific solution. Mersen experts can also visit customers to improve performance and operations.

Mersen has a variety of brush-holders, including metric and imperial systems.

The company manufactures brush-holders with dust exhaust systems. These remove carbon dust in a machine and optimise the operating conditions.

Benefits include:

  • Reduction in cleaning maintenance
  • Less insulation measurements
  • Increased generator running time
  • A complete solution for original equipment or retrofit

Brush-holders for grounding devices are robust and are either moulded or machined. They can be used for pressure systems, and come in single or multiple box format. They have insulated studs and an attachment arm and rocker ring.

High-quality engineered solutions

Whatever your electricity source (wind, hydro or cogeneration), our knowledge of the market has enabled us to develop adapted solutions for current transmission, power and data transmission and related areas of expertise.

From components to integrated solutions

The company provides its customers with technological solutions to optimise the performance of their equipment, making them more competitive and contributing to safe and continuous renewable power generation.

Wind power solutions

Our multiple solutions make us a leading supplier to the renewable energy segment, in both the original equipment and replacement markets. We also offer customised reengineered solutions to retrofit our customers' equipment.

Power generation:

  • Power and grounding brushes

Blade orientation (pitch chain):

  • Carbon brushes for pitch motors
  • Signal transfer systems

Wind turbine reliability

Mersen's experience in electrical rotating machines and signal transfer systems allows us to provide wind turbine OEMs and wind generator manufacturers with optimised solutions.

Our Windtracker™ experts also provide diagnostics and repair services to wind farm operators.

Electrical personnel safety

Mersen's field engineers can help with equipment selection and training of service personnel to promote a safe environment.

Equipment protection

Mersen's product specialists bring unique solutions to protect your frequency converters, your turbines, your controls and other electrical equipment.

The company particularly specialises in fuse technology, cooling of power electronics and surge and lightning protection. Mersen's proven technology in high-power switches and medium-voltage fuses provides a safe interface to the grid:

  • Surge protective devices (SPD)
  • Lighting protection systems
  • Fuses and fusegear
  • Air and water cooling systems
  • Cold plates

Mersen's proven technology in high-power switches and medium-voltage fuses provides a safe interface to the grid.

Hydro-power solutions

Mersen offers the hydroelectric industry reliable electrical, mechanical and sealing solutions, as well as a broad range of adapted services:

  • Power generation : brush-holders, power and grounding brushes and slip ring assemblies
  • Power interconnection: high-power and DC switches
  • Static sealing / fluid handling: Papyex® gaskets
  • Services: motor maintenance services, training, tools and measuring devices

Discover the Mersen network on

Contact Details

Mersen France Amiens
10 avenue Roger Dumoulin
80084 Amiens
+33 3 22 54 45 00
+33 3 22 54 46 08
Company video

Available White Papers


Mersen Dust Collector 19 October 2016 Designed to prevent short circuits caused by low insulation between active coils and ground.


Grade CG677 Carbon Brushes for Wind Turbines 12 October 2016 Improved wind generator performance thanks to low running temperature.


Mersen Pioneers Safety and Reliability Solutions for Hydro Generators 20 October 2014 Hydro power plants drive electric generators, which produce high-voltage AC power for the grid. These generators consist of two main components, a wound rotor (rotating part) driven by water turbine, running inside a stator (stationary part).


Protection Against Electrical Machine Breakdown Through Preventative Maintenance 16 July 2014 The inspection and diagnosis of electrical rotating machine performance are key tools in ensuring the continuous operation and performance of production equipment.


Mersen and Wind / Hydro Power 15 November 2013 A world leading supplier of solutions for electrical protection, power and signal transfer, Mersen contributes to the development of renewable and greener energy sources.