Exchange Circuit Breakers
Exchange Circuit Breakers

Stock exchanges take measures to ease panic selling by invoking Rule 48 and halting trading when markets have severe downside movements. Under the 2012 rules, market-wide circuit breakers, or curbs, kick in when the S&P 500 index drops 7% for Level 1; 13% for Level 2; and 20% for Level 3 from the prior day’s close. A market decline that triggers a Level 1 or 2 circuit breaker before 3:25 pm EST will halt trading for 15 minutes, but will not halt trading at or after 3:25 p.m.

LevelMarket DeclineHalt Trading Time 
Level 1
7%15 minutes
Level 2
13%15 minutes
Level 3
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