What Is a Circuit Breaker in the Stock Market?

Introduction

When the stock market falls very quickly, panic can spread and make things worse. To prevent this, U.S. stock exchanges use circuit breakers, which automatically pause trading during big drops.

How Circuit Breakers Work

Market-wide circuit breakers are based on the S&P 500. If the index falls 7% from the previous day's close, trading stops for 15 minutes. A 13% drop triggers another 15-minute pause. If the index falls 20%, trading stops for the rest of the day.

Why They Exist

Circuit breakers were introduced after the stock market crash of October 1987, when the Dow Jones fell more than 22% in a single day. The pauses give investors time to calm down, process information, and avoid making emotional decisions.

Circuit Breakers in Action

In March 2020, as fears about COVID-19 spread, market-wide circuit breakers were triggered four times in just two weeks. Individual stocks also have their own trading halts if their prices move too sharply in a short time.

Conclusion

Circuit breakers act like a timeout for the stock market. They remind investors that taking a breath during chaos is often the smartest move!