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.
The Kospi, half the value of which is made up of just two tech behemoths (SK Hynix and Samsung), tripped another circuit breaker Friday, leading to a 20-minute trading break. David Goldman, CNN Money, 26 June 2026 Asia-Pacific markets are taking their cue from trading stateside, sending South Korea's Kospi down over 8%, triggering circuit breakers, while Japan's Nikkei is also lower. Leonie Kidd, CNBC, 23 June 2026 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 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

Browse Nearby Words

Cite this Entry

“Circuit breaker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/circuit%20breaker. Accessed 27 Jun. 2026.

Kids Definition

circuit breaker

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

More from Merriam-Webster on circuit breaker

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster