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Electrically insulated rolling bearings from NKE

04 November 2010

NKE Austria's electrically insulated rolling bearings provide reliable protection against shaft current discharges and subsequent corrosion in electric motors, generators and other electrical machines. The bearings are available in three versions: the SQ77 series, with an oxide ceramic insulation layer on the outer ring; the SQ77E series with an insulation layer on the inner ring and the hybrid SQ77B series, which feature ceramic rolling elements with theoretically infinite insulation resistance

The SQ77 and SQ77E ceramic insulation is applied via plasma-spraying and has a guaranteed dielectric strength of at least 1,000V ac or dc. The bearings with outer ring insulation are available as cylindrical roller bearings and as deep groove ball bearings in various designs, dimension series and radial clearance classes.

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