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Circuit Filters or Daily Circuit Filters sets the limit to fluctuations of stock prices. Circuit filters are set by stock exchanges to stop any unduly rising or falling of a stock price.
They are numeric percent limits set on individual scripts. National Stock Exchange of India (NSE) define circuit filters in 5 categories including 2%, 5%, 10%, 20% and no circuit filter.
Circuit filters works in either ways. I.e. if circuit set for equity is 10%, stock price cannot move further +10% to lower then -10%.
Circuit filter changes every day and stock keeps moving between one circuit filter categories to other based on previous day’s closing price. Below is the list of current circuit filters at NSE: | 
