SINGAPORE/SHANGHAI (Reuters) – China will suspend its new stock market circuit breaker as of Friday, the Shanghai and Shenzhen stock exchanges said on their websites on Thursday, after the mechanism sparked sharp falls in the country’s volatile markets. Earlier on Thursday, China’s stock markets were suspended for the day less than half an hour after the open as the mechanism was tripped for the second time this week. “The circuit breaker mechanism was not the main reason for the market slump.