Bankruptcy

[The circuit breaker mechanism] was a market protection mechanism designed to prevent sharp fluctuations and severe declines in the stock market. When abnormal fluctuations occurred in the stock market, [the circuit breaker mechanism] would be triggered, suspending market trading for a period to give investors time to think calmly and allow market sentiment to stabilize.

Stock market circuit breakers were typically triggered by changes in index levels.

Different countries and exchanges had different circuit breakers.