circuit breaker vs disconnector

circuit breaker

noun
  • An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations. 

  • Synonym of trading curb 

  • More specifically, a circuit breaker that automatically breaks overcurrent conditions; a type of overcurrent protective device. 

  • Quarantine measures intended to prevent spread of pandemics, such as the coronavirus. 

disconnector

noun
  • A switching device used to open an electric circuit when there is no current through it. They are used to isolate a part of an electrical system to allow the maintenance staff a safe access to it. 

How often have the words circuit breaker and disconnector occurred in a corpus of books? (source: Google Ngram Viewer )