Thompson Electric Company

Breaker Testing and Coordination


Circuit breakers are designed to work reliably for years. The problem is that circuit breakers fail when you need them to work because they have not had the proper testing, coordination, and maintenance. The experienced team at Thompson Specialty Services understands the proper testing, coordinating and maintaining of circuit breakers and keeping equipment, facilities and personnel safe.    

Circuit breakers are very important for the proper function of power supply systems, being responsible for effectively opening and closing the circuit to remove faults and connect/disconnect parts of the network. They are built to withstand considerable static and dynamic workloads during their lifecycle, which can be several decades. They have to perform its duty after months or years of inactivity, therefore the circuit breaker testing is essential to ensure its function properly and optimize network reliability. Circuit breaker testing can be done at various stages in the life of the CB, in production, commissioning, maintenance, fault troubleshooting, etc.   

Circuit breaker testing is intended to predict an abnormal operation before it happens, saving time and money. High measurement accuracy is required for circuit breaker testing, but we Thompson Specialty Services also understand the importance of limiting your down time while the testing is taking place.  We strive to keep the time that the circuit breaker is out of service short. Close and trip times, synchronism, trip & close coils condition, mechanical motion analysis and status of the DC batteries are the most commonly checked parameters in circuit breaker testing, since a large part of the major failures have mechanical origin.

Testing Capabilities 

  • Primary current injection testing
  • Relay testing
  • Current Transformer testing
  • Recloser and Sectionalizers
  • Switchgear Testing
  • Heat runs
  • Ground Grid testing 


Thompson Knows
Thompson is your electrical contractor for controls & automationThompson is your electrical contractor for electrical maintenance
Thompson is your electrical consultant for electrical safetyThompson is your electrical consultant for electrical engineering services
Thompson is your electrical contractor for solar and sustainable energy

Thompson Automation and Specialty Services provides automation & controls support and specialty electrical services to help our customers operate their facilities more efficiently, in compliance with government and safety standards, their electrical systems running at optimal energy efficiency levels, and help them reduce their ever-growing energy costs.

Contact us today for more information on how we can help your business operate safely, energy efficiently, cost effectively, and in compliance for years to come.