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The Inpro/Seal Smart CDR® is a zero maintenance shaft grounding solution that outlasts and outperforms other designs. 

The Smart CDR protects bearings from harmful stray shaft currents by providing a low impedance path to ground, diverting those currents safely away from the bearings. Proprietary conductive filaments are coupled with a bearing-bronze sleeve to achieve premium shaft grounding performance and extended equipment life.

The innovative sleeve provides a consistent contact surface for the conductive filaments, making the Smart CDR less susceptible for grounding ineffectiveness caused by shaft conditions, contamination or oxidation. This unique design eliminates the time-consuming and costly maintenance associated with other grounding rings.

When carbon filaments and the shaft are in direct contact, as in most grounding ring designs, conduction inhibiting oxidation forms on the shaft, reducing the grounding ring's effectiveness over time. The application of silver coatings or other maintenance to the shaft are required at regular intervals to maintain performance. The bronze shaft sleeve of the Smart CDR eliminates this oxidation permanently, requiring no ongoing maintenance.

To further ensure reliability, the Smart CDR is designed with a Smart Terminal for performance monitoring on the Smart Ground Monitor.


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Features and Benefits

  • Smart Terminal: connects to the Smart Ground Monitor to provide condition monitoring
  • Conductive Filaments: provide a path to ground for shaft currents, away from the bearings
  • Shaft Sleeve: promotes premium grounding performance through consistent contact with conductive filaments; prevents conduction inhibiting oxidation from forming on the shaft
  • Conductive O-rings: maintain conductivity for shaft currents and drive shaft sleeve


  • VFD-driven motors and coupled equipment