carbon brush holders
carbon brush holders
carbon brush holders
carbon brush holders

Carbon brush holders range

Carbex offers a wide spectrum of carbon brush holders – from standard to customized solutions.

The function of the carbon brush is to transmit electric power or signals between fixed and rotating parts. This can occur within a wide range of applications in different operational conditions, all of which have special requirements. With our experience, that stretches back to 1887, we know what high demands are required of carbon brush holders in terms of design and performance.

Many of our carbon brush holders are designed in-house with unique and smart solutions which no other supplier on the market can offer. Check out our inquiry portal, PDF data sheets with product information or contact us.

Carbex researches – develops and tests – verifies carbon brush holder materials and designs to ensure that we as a company are a strong innovative partner at the cutting edge of power and signal technology.

Standard Carbon brush holders

Brush holders DE

Brush holders DD

Brush holders DDG

Brush holders TBS


For more information, see our PDF data sheets!

Carbon brush holder | V-Type

V-Type is a carbon brush holder designed to attain balanced spring pressure, current distribution and reduced carbon brush wear. We have achieved this by using a main spring for all the brushes in the same phase and ensuring the angle to the slip ring is always 90°. This allows for adjustment of the angle of the pressure fingers to compensate for the spring’s various properties and the carbon brush’s actual weight when the brush is worn down.

The V-Type carbon brush holder also has a pressure plate that distributes the pressure. It also eliminates conductors in the carbon brushes from coming into contact with the slip ring when the brushes are worn down.

A carbon brush is not homogenous but pressed with a specific density that results in small variations of brush wear. To solve this, the V-type is equipped with compensation springs for each individual carbon brush.

Advantages of V-Type

  • Equal force on all carbon brushes
  • Prevents uneven brush wear and tear
  • Reduced maintenance
  • Space-saving design
  • Lower total weight
  • Integrated mechanical wear stop function
  • Designed to suit most common generators on the market


  • Sensor for measurement of brush wear that emits a signal when it is time to change carbon brushes.
  • Sensor for external fan control to maintain optimal operating temperature (approx. 80°C).
Carbon brush holders
Carbon brush holders

Carbon brush holder | Optimus

The DDG version of the Carbex in-house developed Optimus brush holder is suitable for a variety of slip ring applications. This holder has many functions that are missing from traditional and more commonplace systems on the market.

  • The brush holder is inclined with self-aligning brushes which ensure perfect contact with the slip ring surface. This ensures extended service life of the carbon brushes.
  • The brush holder arms feature ”hooks” for easier unfolding with its hoisting rings. Practical for confined and restricted spaces.
  • The brush holder’s arms can be easily locked in retracted position which facilitates brush replacement or other types of maintenance.
  • Carbon brushes can be assembled or disassembled quickly and easily from the brush holder with a spring pressure bolt.
  • Well suited for installations in confined or restricted spaces.
  • The Optimus DDG can be assembled and disassembled in an easy and straightforward manner as it and does not need to be pushed or threaded onto the insulated brush holder bolt. The brush holder’s design allows the main block to be split into two parts and thereafter realigned and tightened during reassembly.
  • If required, the brush holder can be equipped with a sensor that emits a signal when the carbon brushes have been worn down to a predetermined level.
  • Suitable for all type of slip rings, including those with larger diameters.

Carbex researches – develops and tests – and verifies brush holder materials and designs to ensure that we as a company are at the cutting edge as an innovative partner within power and signal technology.

optimus brush holder
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thumbnail of Carbex Optimus Brush Holder
Product information (PDF)

Customer-specific solutions

Safe and cost-effective solutions within power and signal transmission are our driving force. Countless hours have been dedicated to developing unique carbon brush holder solutions and we continue to do this with our customers. We are proud to be seen as a ”difference-maker” for customers who need our skills and solutions.

Our engineers and designers swiftly draw up drawings and prototypes for testing, evaluation and end product assessment and approval.

Selection of brush holder

A  carbon brush holder assembly fulfils a significant function for a complete and satisfactory slip ring system

It is therefore of the utmost importance that you allocate sufficient time to identifying the spring system and spring pressure as well as placement and configuration of the carbon brush holder. The objective is to achieve the best possible combination of contact and voltage drop. This is because it affects system stability, mainly in the form of thermal loss.

The most common spring system assemblies are:

1. Pressure finger – Most common alternative where the carbon brush length does not exceed 65 mm.

2. Constant force spring – Most common where carbon brushes have longer dimensions e.g. carbon brush holder assemblies for generators in wind power turbines.

3. Tension spring – Usually used for smaller carbon brushes and are a constituent part of the carbon brush design.

Selection of spring system

Choice of a spring system is usually related to the dimensions of the carbon brush. It is important to be aware of the fact that variations in spring pressure, depending on the characteristics and movement of the spring, can be up to ±10%.

It is also very important that the brush’s regular weight is taken into account. When many brushes are arranged in the same phase it is essential that they are at the same angle of inclination to the slip ring’s contact surface. This is to avoid pressure differentials and any possible imbalances in distribution of currents between the brushes.

Spring pressure

There are many different theories and schools of thought regarding the best spring pressure. It is important to ensure that the pressure is sufficient for the function and application, where vibrations, contact and voltage drop are all taken into account. Spring pressure usually varies between around 175-250 cN. For train locomotives and applications where vibrations prevail with high amplitude, significantly higher pressure can be used.