Operation of a Knife Switch

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To avoid arcing while interrupting higher voltages, a spring-powered knife switch can be used to cut the current as fast as possible. For a mechanical knife switch, this can be achieved by using a spring to connect the knife to the handle. The energy built up in the spring while pulling the handle will abruptly be released when it surpasses the friction between the knife and the clamps.
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Contributed by: Erik Mahieu (May 2012)
Open content licensed under CC BY-NC-SA
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"Operation of a Knife Switch"
http://demonstrations.wolfram.com/OperationOfAKnifeSwitch/
Wolfram Demonstrations Project
Published: May 7 2012