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CoolBlue Inductive Absorber Rings for VFD Motor Bearing Protection

Dreisilker Electric Motors is an authorized distributor of CoolBlue Inductive Absorber Rings, designed to help protect motor bearings from harmful common-mode currents and high-frequency noise generated by variable frequency drives (VFDs). CoolBlue inductive absorbers dissipate damaging electrical energy, helping to maximize motor reliability, reduce maintenance costs, and increase uptime.

Many of our customers rely on CoolBlue as an effective solution for improving motor reliability in VFD-driven applications. Contact our team to learn how CoolBlue inductive absorber rings can support your operation and why so many customers choose CoolBlue for bearing protection.

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What are CoolBlue Inductive Absorber Rings?

CoolBlue Cores Installed

CoolBlue Inductive Absorber Rings are bearing protection devices designed to reduce harmful electrical currents generated by variable frequency drives (VFDs). When motors operate on VFDs, high-frequency common-mode currents can travel along the motor shaft and discharge through the bearings. Over time, this electrical discharge can cause bearing fluting, pitting, and premature bearing failure.

CoolBlue rings are installed on the motor power leads and function as a common-mode choke, absorbing and dissipating high-frequency electrical energy before it can reach the motor bearings. By reducing these damaging currents, CoolBlue inductive absorber rings help extend bearing life, improve motor reliability, and reduce unplanned downtime.

Unlike shaft grounding brushes or rings that require ongoing maintenance, CoolBlue rings are a passive, maintenance-free solution that protects bearings without direct contact to the motor shaft. This makes them an effective and reliable option for HVAC and industrial motor applications where uptime and long-term performance are critical.

CoolBlue inductive absorber rings are commonly used on VFD-driven motors in applications such as pumps, fans, compressors, and other rotating equipment where electrical bearing damage is a concern.

How to Select CoolBlue Inductive Absorber Rings

Selecting the correct CoolBlue inductive absorber ring depends on your motor and drive specifications. Our team is here to help ensure you choose the right solution for your application.

1. Gather Your Motor & Drive Information

To properly size a CoolBlue ring, it’s helpful to have:

  • Motor horsepower (HP)

  • Length of the lead wire

This information allows us to recommend the correct ring for effective bearing protection.

2. Choose the Appropriate CoolBlue Ring

CoolBlue inductive absorber rings are available in multiple sizes and current ratings to match a wide range of VFD-driven motors. Each ring is designed to dissipate high-frequency common-mode currents and protect motor bearings from electrical damage. Select the correct rings and cores based on the HP and length of the wires:

CoolBLUE HP # of Cores
Part Number Range 1-150 ft 151-300 ft  301-450 ft  451-900 ft 
CBO43HP1/4-50A4 1/4-10 2 4 6 8
CBO43HP1/4-50A4 11-50 4 4 6 8
CBO68HP51-100A6  51-100 4 4 6 8
CBO155HP101-428A12  101-428 4 4 6 8
CBR166HP429-1631A16 429-1631 4 4 6 8
CBO326HP1632+A23 1632+ 4 4 6 8

If you’re unsure which ring is right for your application, our team can assist with selection.

3. Order Online or Contact Our Team

Many CoolBlue rings are available for direct purchase through our online store. For assistance with sizing, availability, or lead times, contact Dreisilker Electric Motors directly — our specialists can help ensure you get the right product the first time.

4. Installation Support

CoolBlue inductive absorber rings are installed on the motor power leads and require no ongoing maintenance. If you have installation questions or need additional technical guidance, our team is available to help.

Start protecting your motor bearings by installing CoolBlue Rings.

Order CoolBlue Rings Here

How it Works – A Full System Approach

The proper combination and type of CoolBlue Induction Absorber rings acts as a Common Mode Choke (CMD) absorbing the noise at the point it hits the power cables. By intercepting the noise before it gets to the motor, the noise is dissipated and not able to harm the motor’s components. Dreisilker’s motor solution professionals will work with you to optimize your full power delivery system. From VFDs to compatible noise abatement system, using the correct CoolBlue Inductive Absorber Rings can help you maximize reliability, reduce maintenance costs, and increase uptime.

Call us today to understand how many rings per lead wire you need. Our motor experts are trained and understand how to choose the correct CoolBlue based on your motor and set up.

CoolBlue Application Diagram web

Applications

  • OEM Manufacturers of HVAC Equipment
  • Paper/Bottling/Food/Chemical Manufacturing
  • Washdown Applications
  • Hospital, Office & Commercial Buildings
  • Automobile and Related Product Manufacturing
  • All Pump and Fan related applications
  • Wind, Solar and other renewable energy applications
  • All Variable Frequency Drive Applications

See the Study Results

The proper combination and type of CoolBlue Induction Absorber rings acts as a Common Choke Mode (CMD) absorbing the noise at the point it hits the power cables. Destructive Noise is eliminated prior to reaching the motor. For more case studies and information, check out CoolBlue FAQ

CoolBlue Wave without CoolBlue

Without CoolBlue

CoolBlue Wave withCoolBlue

With CoolBlue

Start protecting your motor bearings by installing CoolBlue Rings.

Order CoolBlue Rings Here