circuit breaker

noun

: a switch that automatically interrupts the current of an overloaded electric circuit

Examples of circuit breaker in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Wiring high-voltage and control lines from units to circuit breakers and securing the connections. Nick Perry, USA Today, 28 May 2026 In a fitting last twist, Colbert and McCartney walked backstage so the latter could flip a mock circuit breaker, effectively turning off the lights on the set and also causing the theater itself to be sucked into an inter-dimensional portal of some sort. Spin Staff, SPIN, 22 May 2026 The Kospi has had 8 single-day gains of 5% this year, also had a one-day drop of 12% in March during the Iranian war, and triggered market-halting circuit breakers multiple times this year. Todd Gordon, CNBC, 12 May 2026 The required circuit breaker size also depends on the charger’s output current. Mckynzie Steward, AJC.com, 1 May 2026 See All Example Sentences for circuit breaker

Word History

First Known Use

1872, in the meaning defined above

Time Traveler
The first known use of circuit breaker was in 1872

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Cite this Entry

“Circuit breaker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/circuit%20breaker. Accessed 4 Jun. 2026.

Kids Definition

circuit breaker

noun
: a switch that automatically stops the flow of electric current in an overloaded circuit

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