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 required circuit breaker size also depends on the charger’s output current. Mckynzie Steward, AJC.com, 1 May 2026 This redundancy means that, if one pathway fails, operators can reconfigure the network by opening and closing switches and circuit breakers to redistribute power onto alternate lines. Big Think, 22 Apr. 2026 If the circuit breaker controlling your water heater has tripped, the unit won’t receive electricity and will stop heating water. Katie Cloyd, Martha Stewart, 21 Apr. 2026 Atom Power’s solid-state circuit breaker technology offers a significant leap in safety, company officials said. Charlotte Observer, 11 Mar. 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 2 May. 2026.

Kids Definition

circuit breaker

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

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