Electrically insulated bearings
Bearings with an insulating coating against current passage — the protection against bearing currents in inverter-driven motors and generators.
44 items in this range
Why bearing currents destroy bearings
Frequency inverters generate high-frequency shaft voltages. Discharging through the bearing they melt micro-craters into the raceways (EDM effect) and cause the typical fluting — the bearing fails long before its calculated life. Mainly affected: inverter-fed motors, generators and traction drives.
How the insulation works
Insulated bearings carry an aluminium-oxide ceramic coating on the outer or inner ring — known as SKF INSOCOAT (VL0241/VL2071) or FAG J20AA/J20AB. It blocks DC and low-frequency currents; dimensions are unchanged, so they swap in for the standard bearing without design changes.
Selection and mounting
Common practice is one insulated bearing on the non-drive end (NDE); against high-frequency EDM currents, hybrid bearings with ceramic rolling elements are the next step — available on request. Insulated deep groove and cylindrical roller bearings for common motor frame sizes ship from stock.
From this range
Filter in the finder →SKF 6215/C3VL0241 Kugellager (75x130x25)
75 × 130 × 25 mm
incl. VAT + shipping
SKF 6216/C3VL0241 Kugellager (80x140x26)
80 × 140 × 26 mm
incl. VAT + shipping