Here's what to know about so-called “circuit breakers" and when they're used to halt trading on stock markets.

The trading curbs go into effect when the S&P 500 crosses certain thresholds during extreme market volatility.

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there have been five trading days in which trading activity tripped the circuit breakers: October 27, 1997: In response to a significant decline in the Dow Jones Industrial Average (DJIA), the ...

Stocks fell sharply again Thursday, with declines nearing levels that would trigger a marketwide trading halt. These are the ...

During the regular hours of 9:30 a.m. ET to 4 p.m. ET, trading in equities may be paused market-wide if declines in the S&P 500 trigger a "circuit breaker ... The Dow Jones Industrial Average plunged ...

Based on our testing, we confirmed the B-TRAN®-based circuit breaker design meets or exceeds all of the customer-defined target specifications. The SSCB prototypes were then shipped to the ...