Circuit breaker operational testing and lubrication of mechanisms are key aspects in maintaining circuit breakers to help ensure reliable operation. This interactive 3-day course focuses on theoretical background with practical field experience to provide vital knowledge for optimizing circuit breaker reliability.

The first two days will cover circuit breaker testing and maintenance. Moving parts on circuit breakers can wear and alignments and clearances can change causing critical functions to be negatively affected. Circuit breaker testing reveals these and other changes in advance of a failure, which could render the equipment inoperable and cause damage to the electrical power system. An introduction of various mechanism types, interrupters and testing methodologies will be discussed. For each test, there will be an in-depth discussion of the measurement, setup and test methodology, and acceptance criteria. Test results will be used for reporting and maintenance purposes and used for historical data samples to improve maintenance schedules. A specialist will provide training to decipher and review apparatus test results so that they are clear and easy to understand.

The third day, in partnership with FirstPower Group LLC, will provide the basics for a mechanism lubrication program. Making the right decisions about lubrication can ensure reliable, long life performance of circuit breaker mechanisms. Lubrication fundamentals, selecting the right greases and oils for circuit breaker applications, field practices and case studies will be discussed. Attendees will have a combination of classroom work and hands-on experience on various circuit breakers.


Learning Outcomes

Upon completion of this course, the participant will be able to:

  • Understand the operation of circuit breakers
  • Know when to perform routine circuit breaker tests
  • Interpret test results, case studies, and numerous field examples
  • Effectively create test plans using the manufacturer’s circuit breaker specifications
  • Confidently use Vanguard or Doble circuit breaker analyzers software to perform routine circuit breaker tests and manage test plans and test results
  • Understand lubricant options, how lubricants work and why they fail
  • Select and apply correct lubricants for circuit breaker mechanism components, for example trip latches on different mechanisms, prop bearings, cams, gears and chains
  • Analyze lubrication related problems


Substation test engineers and technicians working in operations, maintenance, engineering, or other service field in which knowledge of circuit breaker testing methods and lubrication application are a required part of their job responsibilities.


An experienced Vanguard or Doble Technical Application Engineer.
An engineer or technician experienced in circuit breaker lubrication.

Get EMPOWERED with Doble

Title: Circuit Breaker Maintenance and Mechanism Lubrication
Duration: Three Days
Class Size: 8-15 Attendees
Credits: Up to 2.4 CEUs or 24 Professional Development Hours

Register for Scheduled Class:
November 19-21 | Ontario, CA
July 21-23 | Ontario, CA

Scheduled Course Price: $1600

For more information, download our detailed course brochure or contact sales.

2019/2020 Training Calendar

Doble Engineering Company

Doble Engineering Company