Circuit breakers refer to the trigger points used by IIROC to determine when to halt trading activity on Canadian equity marketplaces due to a significant change in securities prices. Circuit breakers were originally introduced after the 1987 market drop in order to provide a cooling-off period when the market is falling to prevent investors from reacting all at once. IIROC works in co-ordination with U.S. markets to determine when circuit breakers should be invoked.

The trigger points for circuit breakers are based on levels of fluctuation in the Dow Jones Industrial Average as calculated by the New York Stock Exchange. Notices are used to notify marketplace participants of any changes to the trigger points for invoking circuit breakers.

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