circuit breaker

noun5

1. •
   An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations.

   • Typically traction packages monitor the supply frequency and if it strays outside pre-set limits open the circuit breaker between the pantograph and the transformer to shut off the power. — 2019
2. •
   A circuit breaker that automatically breaks overcurrent conditions; a type of overcurrent protective device.
3. •
   Synonym of trading curb.
4. •
   (Singapore) Quarantine measures intended to prevent spread of pandemics, especially COVID-19.
5. •
   A design pattern used to detect failures and prevent them from constantly recurring.