Circuit Breakers Starts Today 24 Feb 2014, if you still not sure what it is about, you can read more on the 2 link below.
Singapore Exchange says the circuit breakers will initially apply to the Straits Times Index, MSCI Singapore Index component stocks and all securities priced S$0.50 and above.
http://www.channelnewsasia.com/news/business/sgx-to-introduce-dynamic/963616.htmlRegulatory Announcement - SGX proposes circuit breakers in securities market
http://www.sgx.com/wps/wcm/connect/cp_en/site/press_room/news_releases/regulatory+announcement+-+sgx+proposes+circuit+breakers+in+securities+market?presentationtemplate=design_lib%2FPT_Printer_Friendly
