1. In General, this is a point in a circuit that has a device that can interrupt and shut down the circuit under specific conditions, such as too much flow, heat, fire. Mainly used in electrical circuits. 2. In Program trading , this is device or method to interrupt the trading of one or more particular stocks under specific conditions, such as sudden fall in a stock’s price or the market overall. Employed after the third Black Monday occurred on October 27, 1997. The objective is to prevent a ‘melt down’ or freefall of market prices.
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