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May 24 2007, 12:18 PM EDT (current) msnyder 64 words added
May 24 2007, 12:17 PM EDT msnyder

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A type of power switch, often used on table saws and other large stationary machines. Typically, it contains contact points that are held closed--when the switch operates in the "on" position--by electromagnetic attraction. In the event of a power interruption, the attraction stops, allowing a spring to pull the contacts apart, turning the switch off. This prevents on accidental restart when electrical power returns.