Handy information.

Dow 3rd Quarter 2011 Circuit Breakers

These will trigger if significant drops happen and all trading will be suspended for a set amount of time if not completely.

In third-quarter 2011, the 10-, 20- and 30-percent decline levels, respectively, in the DJIA will be as follows:

Level 1 Halt
A 1,200-point drop in the DJIA before 2 p.m. will halt trading for one hour; for 30 minutes if between 2 p.m. and 2:30 p.m.; and have no effect if at 2:30 p.m. or later unless there is a level 2 halt.

Level 2 Halt
A 2,400-point drop in the DJIA before 1:00 p.m. will halt trading for two hours; for one hour if between 1:00 p.m. and 2:00 p.m.; and for the remainder of the day if at 2:00 p.m. or later.

Level 3 Halt
A 3,650-point drop will halt trading for the remainder of the day regardless of when the decline occurs.