It is fairly rare for the main circuit breaker to "trip," because usually, it is individual circuit breakers that trip long before there is a need for the main breaker to shut off.

Circuit breakers were triggered in Japan, South Korea and Taiwan's stock markets as they reacted to President Donald Trump 's sweeping tariffs on Monday, with U.S. markets opening the week sharply ...

A plunge in U.S. markets on Monday triggered a 15-minute trading halt in stocks after the S&P 500 fell 7% shortly after the market opened.