CoolBLUE® cores, also referred to as CoolBLUE® inductive absorbers or CoolBLUE® rings, are passive components engineered by Magnetec and distributed throughout North America by MH&W International. These cores are available from Oslin Nation Co., an authorized MH&W International distributor and trusted source for variable frequency drive (VFD)-related motor protection solutions.
Designed to mitigate the high-frequency currents induced by VFDs, CoolBLUE® inductive absorbers safeguard motor bearings, insulation systems, and nearby electronic components. By reducing electrical discharge damage and suppressing electromagnetic interference (EMI), they deliver a reliable, maintenance-free solution for advanced CoolBLUE® motor protection.
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CoolBLUE® Cores Technical Specifications
| Specification | Details |
| Core Material | Nanoperm® nanocrystalline alloy |
| Geometry Options | Oval and round core types, sized according to motor power and cable layout |
| Motor Power Range | From ¼ HP to over 1,600 HP (customizable by application) |
| Operating Temperature | Rated to 158 °F (70 °C); passive cooling with no material degradation |
| Installation Method | Tool-free slip-over design; supports single or multiple cable turns |
| Companion Product | Optional NaLA® cores for differential-mode protection in <10 HP systems or high-frequency VFDs |
Modular Deployment of CoolBLUE® Cores
Unlike standardized components, CoolBLUE® rings function as part of a modular protection system, allowing engineers to match the size and quantity of cores to the specific needs of each application. Variables considered include:
- Motor horsepower and VFD switching frequency
- Conductor count and cable geometry
- Space constraints in control panels or motor junction boxes
In higher-frequency or high-stress environments, multiple cores may be installed per motor to optimize effectiveness. This scalable deployment model enables precise, application-specific CoolBLUE® motor protection.
Key Benefits of CoolBLUE® Inductive Absorbers
CoolBLUE® inductive absorbers offer a range of practical advantages that make them an effective and reliable choice for VFD motor protection. From extending equipment life to simplifying installation, the following benefits highlight why CoolBLUE® cores are trusted across industries and applications.
1. Extend Motor Bearing Life
CoolBLUE® cores reduce harmful common-mode bearing currents by approximately 65–83%, minimizing failure mechanisms such as electrical discharge machining (EDM), frosting, and fluting. This dramatically extends bearing life and protects system integrity.
2. Decrease Downtime and Ongoing Costs
With fewer bearing failures and reduced electrical interference, users report significantly lower maintenance expenses and improved operational uptime across industries.
3. Install Without System Modification
No grounding rings, brushes, or shaft alterations are required. CoolBLUE® cores install externally on VFD output cables, making them ideal for both OEM integration and retrofit projects.
4. Maintenance-Free Operation
Manufactured from high-saturation nanocrystalline alloy, Nanoperm®, CoolBLUE® inductive absorbers are inherently corrosion-resistant and thermally stable, requiring no ongoing service once installed.
5. Improve EMI Performance
As common-mode chokes, these inductive absorbers suppress EMI that can disrupt drives, PLCs, and sensitive instrumentation, especially valuable in noise-sensitive environments such as industrial automation or building systems.
Cross-Industry CoolBLUE® Motor Protection
CoolBLUE® cores are deployed in a wide range of sectors where VFD-driven motors are essential:
- Industrial Manufacturing: Conveyor systems, extruders, mixers
- HVAC & Building Systems: Large air handlers and chillers
- Water & Wastewater Treatment: Pumps, blowers, and mixers
- Food & Beverage Processing: Sanitary motor protection in automation lines
- Mining & Aggregates: Crusher, fan, and hoist motor reliability
- Renewable Energy: Applied in wind turbines and inverter-based systems
- Precision Servo Systems: Often paired with NaLA® for differential-mode suppression
Your Authorized CoolBLUE® Distributor
Oslin Nation Co. is proud to supply CoolBLUE® cores and NaLA® companions across a wide range of applications. As an authorized partner of MH&W International, we offer technical guidance, product sizing, and application support to help you confidently implement proven VFD motor protection.
