Excellent Electrical Insulation – The outer ring features a plasma-sprayed aluminum oxide coating (100–500 μm thick) with dielectric strength up to 3000V, blocking shaft currents to prevent electrical erosion and lubricant degradation.
Variety of Types – Both C3/C4 and brass retainers, stamped steel retainers, are available for selection.
Standard Dimensions – Built to international standards for direct replacement of same-model bearings.
Reliable Quality – Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
TFL 6314/C3VL0241 is fully compatible with SKF/FAG/NKE/NSK/NTN equivalents in dimensions, clearance, and insulation performance, allowing direct replacement without equipment modifications. Each bearing undergoes rigorous dielectric testing and dimensional checks, offering equivalent reliability while reducing total ownership costs. Opting for TFL provides ISO-certified quality and flexible supply chain support.
| SKF | FAG | NKE | NSK | NTN |
|---|---|---|---|---|
| 6314/C3VL0241 | 6314-J20AA-C3 | 6314-M-C3-SQ77 | 6314HDY2C3 | 7MC3-6314C3 |
TFL specializes in the development and manufacturing of electrically insulated bearings, using advanced plasma-spraying technology to ensure a uniform aluminum oxide coating for long-term stable insulation. Certified under ISO 9001:2015, we offer flexible delivery with no MOQ and provide end-to-end services from design to technical support. Choosing TFL means accessing cost-effective products that reduce maintenance costs and downtime risks.
Breakdown voltage (DC) — 1000–3000 V; electrical resistance 50–200 MΩ.
High reference speed — up to 9500 r/min.
Sheet metal cage with C3 clearance — lightweight, cost-effective for standard applications.
TFL insulated bearings are widely used in VFD motors, generators, pumps, fans, and wind turbine systems. The insulation coating blocks shaft current paths to minimize electrical erosion, making them ideal for high-voltage and variable-speed operations. Our bearings ensure stable performance in humid and vibratory conditions, extending overall system life.
TFL 6314/C3VL0241 is the standard replacement for the drive-end of general-purpose VFD motors (typically IEC Frame 250-280), such as the Siemens Simotics SD or ABB M3BP series. The C3 clearance is the industry standard for these motors to manage normal thermal expansion, while the 63-series geometry handles belt tensions effectively. By capitalizing on China’s massive manufacturing capacity for standard series bearings, TFL can offer these high-volume insulated bearings with exceptional cost-efficiency and production speed, providing global distributors with a competitive edge against the long lead times and high premiums often associated with European incumbents.
This bearing is ideal for electric motors driving large centrifugal water pumps, such as those in KSB Omega or Grundfos NK lines used in municipal water treatment and supply. The 63-series load rating supports the radial forces of the impeller, while the insulation is crucial for modern systems. As global regulations like the EU Ecodesign Directive increasingly mandate the use of Variable Frequency Drives (VFDs) to reduce energy consumption in pumping systems, TFL’s VL0241 insulated outer ring acts as a key compliance enabler; it ensures the motor can operate efficiently with a VFD without succumbing to premature bearing failure caused by electrical erosion.
Widely used in the main motors of stationary industrial air compressors from brands like Atlas Copco or Kaeser. These machines typically run continuously to supply factory air, requiring the C3 clearance to maintain stability as the motor reaches steady-state temperature. The pressed steel cage limits noise and friction, making it suitable for these stable, high-speed applications. TFL’s insulated design prevents the breakdown of grease caused by electric arcing—a common issue in VFD-driven compressors—thereby extending the service intervals and fully matching the performance reliability of OEM components like SKF INSOCOAT.
*The brands and series mentioned are provided for industry illustration only. Final bearing selection should be confirmed through verification of dimensions, clearance class, insulation type, and operating conditions. For selection assistance or technical consultation, please contact the TFL engineering team for support.
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