circuit breaker
A regulatory mechanism that temporarily halts trading on a stock exchange when prices drop by a specified percentage, preventing panic selling spirals.
Example
“The S&P 500 circuit breaker triggered in March 2020 when stocks dropped 7% in minutes, halting trading for 15 minutes.”
Memory Tip
CIRCUIT BREAKER = hits the pause button on panic selling.
Why It Matters
Circuit breakers protect your investments by preventing market crashes from spiraling into complete chaos. When markets drop sharply, these automatic pauses give investors time to think rationally instead of making panic-driven decisions that could wipe out their retirement savings or college funds.
Common Misconception
Many people believe circuit breakers prevent all market losses and guarantee profits, but they simply pause trading temporarily. The circuit breaker does not change the underlying value of stocks or prevent eventual price declines; it only creates a cooling-off period.
In Practice
On March 16, 2020, during the COVID-19 pandemic, the S&P 500 dropped 12 percent in early trading, triggering a 15-minute circuit breaker halt. This pause allowed markets to stabilize before resuming, preventing a potential free-fall that could have turned a bad day into a catastrophic week for everyday investors holding index funds.
Etymology
Borrowed from electrical engineering: a CIRCUIT BREAKER cuts power to prevent overload.
Common Misspellings
Track markets & get real-time stock data
Related Terms
More in markets
Other markets terms you should know
See Also
Need financial definitions?
Clear definitions for 2,500+ finance, insurance, and investing terms.