A Circuit Breaker is 1) a safety device used to interrupt or break an electrical circuit that is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overcurrent or overload or short circuit; 2) temporarily halting trading at which trading is halted market-wide for single-day declines in the S&P 500 Index during dramatic drops and are set at 7%, 13%, and 20% of the closing price for the previous day. The Circuit Breaker is measures approved by the Securities and Exchange Commission (SEC) on U.S. stock exchanges.
Related Definitions in the Project: The Electrical Engineering
