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

For instance, if someone forgets to throw the main circuit breaker to electrically isolate the house from the grid, then the generator could send electrical power beyond the house and out onto the grid. Timothy Dahl, Popular Mechanics, "Home Generator 101: How to Power on When the Power Goes Out," 10 Sep. 2018 Step 5: Electrical Power A water heater always requires a separate 220-volt circuit and in our case a 30-amp circuit breaker and 10/2 (with ground) circuit cable. Steve Willson, Popular Mechanics, "How To Install An Electric Water Heater," 24 Aug. 2018 Exchanges don’t share trading data, there are no circuit breakers or other trading halts, and options for hedging or other sophisticated bets are limited. Steven Russolillo, WSJ, "The Mystery Behind Tether, the Crypto World’s Digital Dollar," 12 Aug. 2018 Restore power to the circuit by switching the circuit breaker back on and test the switch. Roy Berendson, Popular Mechanics, "How to Wire a Light Switch," 17 Oct. 2018 He got involved with the CPSC and circuit breakers in the 1980s. Elisabeth Leamy, ajc, "This circuit breaker is still in homes despite safety concerns," 10 May 2018 To shut off electricity, turn off all small breakers and then shut off the main circuit breaker. Gary Robbins,, "Safety tips to follow before, during and after an earthquake," 8 July 2018 In an effort to get the system back online, Ray reboots the power and journeys into the bowels of the park to flip the circuit breakers. David Sims, The Atlantic, "The Ballad of Ray Arnold," 11 June 2018 And then an electrical issue, which tripped a circuit breaker and knocked out power to the cooler where his perishables are stored, forcing the business to close on a sunny Memorial Day, putting a dent in his holiday weekend. Jim Riccioli, Milwaukee Journal Sentinel, "Waukesha customers helped save John's Root Beer in 2017. Now John is looking for a better season free of road construction," 30 May 2018

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.

See More

First Known Use of circuit breaker

1872, in the meaning defined above

Keep scrolling for more

Learn More about circuit breaker

Statistics for circuit breaker

Last Updated

7 May 2019

Look-up Popularity

Time Traveler for circuit breaker

The first known use of circuit breaker was in 1872

See more words from the same year

Keep scrolling for more

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).


incapable of being surmounted or overcome

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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