When calculating the decline, the sample time is changed from the quarterly average price to the closing price of the previous trading day, and the market fluctuation ratio is changed from 10%, 20% and 30% to 7%, 13% and 20%.
This benchmark index has produced better results than before. Under this mechanism, once the stock index triggers the first 7% and the second 7% 13% during 9:00- 15:25 (US stock market closes 16: 00), trading will stop for 15 minutes and then resume; If it is triggered after 15: 25, it will not be paused.
Under the fuse mechanism based on the standard & poor's index, whenever 20% of the third gear is triggered, the market will suspend trading for the rest of the day.
In addition, after the benchmark index of the fuse mechanism was changed from Dow Jones Industrial Average to Standard & Poor's Index in the United States, the first and second files can only be executed once every trading day. After the first stall is suspended once, it cannot be suspended again unless the stock market fluctuates to the second stall standard again. Similarly, once the second gear is suspended, it cannot be executed again unless it meets the third gear standard.