circuit breaker

Short definition from Wiktionary

Noun

1. 1
   An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations.
2. 2
   More specifically, a circuit breaker that automatically breaks overcurrent conditions; a type of overcurrent protective device.
3. 3
   Synonym of trading curb.
4. 4
   Quarantine measures intended to prevent spread of pandemics, especially COVID-19.
5. 5
   A design pattern used to detect failures and prevent them from constantly recurring.
6. 6
   Alternative spelling of circuit breaker.