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.

It can be difficult to determine if you've got a bad circuit breaker. There are steps you can take before deciding to repair, replace, or call an electrician.

Whether you're replacing an old circuit breaker or adding a section to safely power a new appliance, here is an idea of how much it will cost you.

There are three circuit breaker levels: Level 1: The S&P 500 falls 7% intraday. If this occurs before 3:25 p.m. ET, trading is halted for 15 minutes.

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.