#TCNNF
What happened?  When you coming back up to $48?

What are circuit breakers?
Circuit breakers are measures implemented by exchanges when they consider price movements to be overly volatile. They can take the form of a trading suspension or limiting buying and selling of securities within a specific price range. 
Purpose:
Circuit breakers can be triggered to curb in panic-selling or manic-buying. 
Applicable assets:
The circuit breaker system applies to both individual securities and market indexes. As a result, it applies to options market as well ...