Marketwide circuit breakers are triggered when the broad-based S&P 500 falls by a certain amount within a single trading day, halting trading across all markets. They can be triggered at three ...

Each pole of the breaker is suitable when the line-to-ground voltage does not exceed the lower voltage marking, while the higher voltage marking is the value the line-to-line voltage may not exceed.

The Investment Industry Regulatory Organization of Canada issued a plan Thursday to create single-stock automatic circuit breakers "to address rapid, significant and unexplained price movement ...