Electrically insulated bearings refer to the general term for bearings that can block current from passing through the bearing itself and have insulating properties. Its insulation performance is usually ensured by coating a layer of insulating material on the outer or inner ring of the bearing with a special process, or the rolling elements are made of ceramic materials. Electrically insulated bearing is a new bearing product that integrates machinery, electrical engineering, materials and other science and technology. Compared with traditional bearings, it increases the insulating function of the bearing itself. This kind of bearing is specially designed to prevent electrolytic corrosion. Long operating life and high reliability.