circuit breaker


Definition of circuit breaker

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

Examples of circuit breaker in a Sentence

Recent Examples on the Web Like Drivia, the Load Center—supported by an Android and iOS app—lets users individually switch circuit breakers off. Matthew De Silva, Quartz, "Here’s a smarter way to save money and energy in your home," 21 Jan. 2020 Replacing a fuse or circuit breaker, for example, may only cost you a couple hundred bucks. Ron Wynn, Dallas News, "Inspect your HVAC system to avoid expensive failures," 12 Jan. 2020 After the death of the courtesan Satine, the company takes a bow in silence, then the club M.C., Zidler, flips a circuit breaker. Alexis Soloski, New York Times, "The Show Must Go On, and On, and On," 20 Dec. 2019 Mapping and labeling each circuit breaker to its relative appliance or room is also a good idea. Meredith Spelbring, Detroit Free Press, "Massive ice storm headed for Michigan: What to know," 10 Jan. 2020 Where some home monitoring products need to plug into every circuit breaker, Sense plugs into a single breaker, and puts two current-sensing loops around the main power cables to monitor electricity flow., "Here’s a new way to keep tabs on power usage in your home - The Boston Globe," 12 Oct. 2019 The automaker says in documents filed with US regulators that fans can seize, and a circuit breaker may not stop them from overheating., "First revamped Toys “R” Us opens in mall in New Jersey," 28 Nov. 2019 Fiat Chrysler says in documents filed with U.S. regulators that fans can seize, and a circuit breaker may not stop them from overheating. Washington Post, "Wall Street’s main indexes close at record levels in low trading as growth data improves," 27 Nov. 2019 The balloon hit a circuit breaker just before 2:30 p.m., leaving 22,186 customers without power for about 30 minutes. Alex Riggins, San Diego Union-Tribune, "Vista outage leaves 2,400 without power, slows traffic on SR-78," 1 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'circuit breaker.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of circuit breaker

1872, in the meaning defined above

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Time Traveler for circuit breaker

Time Traveler

The first known use of circuit breaker was in 1872

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Statistics for circuit breaker

Last Updated

29 Jan 2020

Cite this Entry

“Circuit breaker.” The Dictionary, Merriam-Webster Inc., Accessed 29 January 2020.

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More Definitions for circuit breaker

circuit breaker


English Language Learners Definition of circuit breaker

: a switch that automatically stops the flow of electricity to a place or device if the current becomes too strong or another dangerous problem occurs

circuit breaker


Kids Definition of circuit breaker

: a switch that automatically stops the flow of electric current if a circuit becomes overloaded

More from Merriam-Webster on circuit breaker

Rhyming Dictionary: Words that rhyme with circuit breaker Encyclopedia article about circuit breaker

Comments on circuit breaker

What made you want to look up circuit breaker? Please tell us where you read or heard it (including the quote, if possible).


to assert without proof or before proving

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