Definition of contactor in US English:



  • A device for making and breaking an electric circuit.

    • ‘The plasma contactor system safely grounds the station from this high voltage, protecting it from arcing, which could severely damage its surface.’
    • ‘Rewire the ignition switch so that it can turn on all the new equipment, including the contactor.’
    • ‘That Sunday, our electricians discovered the external-power contactor, installed in 1983, had broken.’
    • ‘After two weeks of scrubbing the aircraft for causes, the problem was traced to a loose wire in the back of the emergency-battery contactor.’
    • ‘A combination circuit breaker/motor starter includes a circuit breaker trip unit having a microprocessor and at least one removably connectable contactor or other functional module.’