Excellent Electrical Insulation – The inner 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.
Internal insulation – Minimizes risk of coating contact wear because the outer ring remains uncoated, ideal for tight-fit housings.
TFL 6314/C3VL2071 is fully compatible with SKF and FAG 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 |
|---|---|
| 6314/C3VL2071 | 6314-J20C-C3 |
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.
High reference speed — Up to 9500 r/min.
Internal insulation – Minimizes risk of coating contact wear because the outer ring remains uncoated, ideal for tight-fit housings.
Breakdown voltage (DC) — 1000–3000 V; electrical resistance 50–200 MΩ.
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/C3VL2071 is frequently utilized in the refurbishment of traction motors for metro and light rail systems, such as older Siemens models. In these maintenance scenarios, the motor housing (end shield) often requires a tight interference fit with the bearing outer ring. Using an outer-ring insulated bearing (VL0241) here poses a risk of cracking the coating during press-fitting; therefore, the VL2071 Inner Ring Insulation is the preferred engineering solution. It provides the same level of electrical protection against stray currents while ensuring the coating remains intact on the shaft. This configuration helps operators comply with strict railway safety standards like EN 50155, ensuring that electromagnetic interference does not compromise the bearing’s structural integrity or the train’s signaling systems.
This model is suitable for the generator bearings of land-based wind turbines, particularly in Double Fed Induction Generator (DFIG) systems found in Vestas or Goldwind turbines. The VL2071 Inner Ring Insulation is critical here because the generator rotor shaft carries significant voltages. By insulating the inner ring, the bearing effectively blocks the current at the source (the shaft) before it can arc through the rolling elements to the grounded housing. Inner ring insulation technology is complex and manufacturing capacity is often limited globally; however, TFL leverages China's advanced and scalable industrial supply chain to offer these specialized inner-coated bearings with significantly shorter lead times than European competitors, helping wind farm operators minimize costly downtime during generator repairs.
TFL 6314/C3VL2071 is also designed for heavy-duty DC motors used in steel rolling or paper processing, such as those manufactured by ABB or Nidec. In these large motors, the housing design often dictates a very tight fit for the bearing outer ring to handle heavy radial loads (supported by the robust 63-series design). The VL2071 configuration places the ceramic coating on the inner ring bore, avoiding any risk of coating damage during the housing installation process. This ensures reliable insulation against shaft voltages caused by thyristor-based drives, preventing fluting marks and extending the motor’s operational life in continuous production environments.
*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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