knife switch

noun Electricity.
a form of air switch in which a moving element, usually a hinged blade, is placed between two contact clips.

Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knife switch
 
n
an electric switch in which a flat metal blade, hinged at one end, is pushed between fixed contacts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Open the knife switch and connect the wire from the bottom end of the nail to the terminal on the knife switch.
In order to restore normal power to the mall, the crew had to unlock and open a pad-mounted cabinet and throw a knife switch.
All knife switch blades shall be de-energized when the switch is in the open position.
Never open ground relay protective knife switch to prevent repeated tripping of ground relay.
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