High-Voltage Ceramic Insulation – Plasma-sprayed alumina coating (100–500 μm) provides 1000–3000 V dielectric strength, preventing electrical fluting and lubricant breakdown.
Solid Brass Cage for High Thermal Stability – The M-design solid brass cage offers excellent strength and temperature resistance, ideal for heavy-duty and variable-speed motor applications.
Full Interchangeability – Direct replacement for SKF 6311M/C3VL0241, FAG 6311-M-J20AA-C3, and NTN 7MC3-6311C3, ensuring identical fit and clearance.
Reliable Under Harsh Operating Conditions – The insulation-plus-brass-cage design ensures stable performance under humidity, high temperature, vibration, and VFD switching environments.
TFL 6311M/C3VL0241 matches SKF, FAG, and NTN equivalents in dimensions, brass cage design, and insulation performance. Each bearing undergoes dielectric-strength and dimensional inspection to ensure full compatibility and provide a cost-effective alternative without compromising performance.
| SKF | FAG | NTN |
|---|---|---|
| 6311M/C3VL0241 | 6311-M-J20AA-C3 | 7MC3-6311C3 |
TFL applies a highly reliable plasma-spraying process that creates a strong-bond alumina insulation layer on the outer ring, maintaining stability under long-term high-voltage operation. Certified by ISO 9001, ROHS, and REACH, we offer OEM/ODM customization, no MOQ, and fast delivery. For customers seeking SKF/FAG alternatives, TFL provides superior availability and cost efficiency without compromising quality.
Plasma-sprayed alumina insulation (100–500 μm)
M-design solid brass cage — high strength and heat resistance
Outer-ring insulation type VL0241 — standard 6311M dimensions retained
TFL 6311M/C3VL0241 is widely applied in VFD motors, industrial generators, centrifugal pumps, compressors, power-plant auxiliary drives, and wind turbine generators. The ceramic insulation blocks shaft currents while the brass cage enhances durability under high temperature and vibration.
TFL 6311M/C3VL0241 is suitable for Siemens 1LE0001 and ABB M3BP VFD motors. The PWM-driven system can induce shaft currents that damage the raceways. TFL’s ceramic insulation tolerates up to 3000 V, and the brass cage improves heat resistance, making it an ideal alternative to SKF/FAG insulated types (compatibility example only).
TFL 6311M/C3VL0241 is recommended for Grundfos CR multistage pumps, KSB Eta centrifugal pumps, and Siemens industrial fans. Humidity and VFD-driven operation tend to induce shaft currents, but TFL’s VL0241 insulation remains stable in these conditions (compatibility example only).
In wind turbines, TFL 6311M/C3VL0241 can be applied in Goldwind GW121/2500, Vestas V90, and Siemens Gamesa 2.3 MW generator systems. These units face humidity and variable-speed vibration; TFL’s ceramic coating withstands up to 3000 V and offers corrosion resistance (compatibility example only).
*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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