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An INSOCOAT bearing is a very economical solution when compared with other insulation methods that protect
a bearing against electric current passage.
INSOCOAT bearings with coated outer ring Bearings with an electrically insulating coating on the external surfaces
of the outer ring are the most common INSOCOAT bearings. They are identified by the suffix VL0241. Outer ring
coated INSOCOAT bearings are recommended for medium size motors, that use 6215, 6313 size bearings and larger.
For applications where smaller bearings are used, SKF recommends hybrid deep groove ball bearings.
INSOCOAT bearings with coated inner ring Bearings with an electrically insulating coating on the external surfaces
of the inner ring provide enhanced protection against electric current damage. The enhanced protection results from
the increased impedance due to the smaller coated surface area. Bearings with a coated inner ring are identified by
the suffix VL2071 and are recommended for larger size motors (typically from bearing sizes 6226, 6324 sizes and larger),
or other applications where the bearings risk being subjected to high shaft voltages.
CagesDepending on the bearing type and size, INSOCOAT bearings are equipped with one of the following cages
• a riveted cage of pressed steel, no designation suffix, or
• a two-piece machined brass cage, rolling element centred, designation suffix M.
Electrical properties
INSOCOAT bearings provide effective protection against AC and DC currents. The specifications for different variants are:
VL0241 Electrical resistance: min. 50 MW, breakdown voltage: max. operating voltage 1 000 V DC.
VL0246 Electrical resistance: > 150 MW, breakdown voltage: max. operating voltage 3 000 V DC.
VL2071 Electrical resistance: min. 50 MW, breakdown voltage: max. operating voltage 1 000 V DC.
VL2074 Electrical resistance: > 150 MW, breakdown voltage: max. operating voltage 2 000 V DC.
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