Motor Bearing Protection

Increase Motor Reliability by Extending Bearing Life

The Importance of Bearing Protection

Bearings are a critical component to electric motors and are designed to operate for many years. Yet, more than half of motor failures are caused by bearing failure due to ineffective bearing protection from contamination ingress, lubrication loss and stray shaft currents. Extend bearing life with superior bearing protection from Inpro/Seal.

Motor with Inpro/Seal Bearing Isolator
Rendering of a leaking lip seal on a motor or pump application

The High Cost of Contact Seals

Contact seals, such as lip seals, are commonly used on motors to seal the bearing housing. Yet, due to their contacting nature, they wear at the point of contact or groove the shaft, rendering them ineffective in a short period of time. This allows lubrication to escape and contamination to enter the bearing housing, leading to premature bearing failure.

A Permanent Sealing Solution

For over 40 years, the Inpro/Seal Bearing Isolator has been increasing motor reliability with permanent bearing protection against contamination ingress and lubrication loss. The Inpro/Seal Bearing Isolator is a non-contacting compound labyrinth seal that significantly increases mean time between repair (MTBR) and decreases maintenance costs.

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mini66 Bearing Isolator

To learn how it works, watch our Bearing Isolator video.

Proven Shaft Grounding Technology

Variable Frequency Drives (VFDs) induce high-frequency voltages on the shaft that discharge through the bearings, leading to bearing failure. Inpro/Seal Smart Shaft Grounding diverts harmful shaft currents away from the bearings to ground, providing long lasting bearing protection for VFD-driven motors.

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Smart Ground Monitor shaft grounding solution

To learn how it works, watch our Smart Shaft Grounding video.

Bearing Protection Designs for Motors

Inpro/Seal Bearing Isolator



The compact, IP66 rated mini66 Bearing Isolator is the standard design for grease lubricated motors.
VB45-S Bearing Isolator


The IP66 rated VB45-S™ Bearing Isolator is used for oil lubricated motors.

Inpro/Seal Smart Shaft Grounding

Smart CDR shaft grounding solution

Smart CDR

The Smart CDR® protects motor bearings from harmful stray shaft currents.
Smart MGS shaft grounding solution

Smart MGS

The Smart MGS® combines premium shaft grounding with Bearing Isolator technology for severe-duty applications.

Facts at a Glance

Inpro/Seal Bearing Isolators:

  • Extend motor life by increasing bearing reliability
  • Do not wear
  • Are non-contacting
  • Do not add drag to the shaft
  • Are maintenance free
  • Can be installed on horizontal and vertical motors
  • Meet IEEE-841 specifications
  • Are backed by our best-in-class performance guarantee

Inpro/Seal Smart Shaft Grounding:

  • Protects bearings from shaft currents
  • Utilizes multiple designs for easy installation
  • Are backed by a robust performance guarantee
Same day shipment paperwork

Same-Day Shipments

Inpro/Seal is committed to making sure you have the right technology, right when you need it. We know that time is money. That’s why we offer same-day shipments on most Bearing Isolators and Smart Shaft Grounding solutions, even new and custom designs. If you require same-day shipments on an Inpro/Seal Bearing Isolator or Smart Shaft Grounding products, contact your local Inpro/Seal Representative.

Increase Reliability. Decrease Costs.

Inpro/Seal increases reliability and enhances performance on rotating equipment across multiple industries with permanent bearing protection and complete shaft seals. Read more about our innovative technologies or the industries we serve.

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Ready to Get Started?

Count on us to improve motor reliability through permanent bearing protection and proven shaft grounding solutions. With over 40 years of experience, we are the trusted source of Bearing Isolator and shaft grounding technologies.

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