Circuit Breaker Maintenance – Low Voltage

Source: AVO Training Institute, Inc.

Low-voltage power circuit breakers are one of the most poorly maintained protection devices in many power systems.  Their exposure to moisture and contaminants makes this type of breaker more susceptible to failure without proper maintenance.  Failure can lead to nuisance trips as well as more serious and life threatening situations like arc flash hazards. 

This hands-on course is intended for new or experienced electricians and technicians that install, maintain, repair or troubleshoot power circuit breakers, rated less than 1000 VAC, equipped with electromechanical or solid state tripping devices. The student should have basic knowledge of AC/DC electricity.  Students must wear long pants and safety toe shoes to complete the lab portion of this course. 

Course duration: 4.5 days

3.6 CEU

Learning Objectives:

  • Identify circuit breaker components
  • Utilize appropriate personal protective equipment and safe work procedures for breaker maintenance
  • Explain removal and restoration procedures
  • Perform circuit breaker maintenance service
  • Perform and evaluate the results of low resistance, insulation resistance and overcurrent tests
  • Verify trip device operation by calculating high current test values from manufacturers’ trip curves. 

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