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A key switch (sometimes called a keyswitch or lock switch) is a key-operated switch.cite-ref-1[1] Key switches are used in situations where access to the switch's functions needs to be restricted.cite-ref-2[2]cite-ref-3[3]

Key switches are available as components with solder connections, and are available with a variety of ampere ratings. They may use tubular or other specially-shaped keys for extra security.cite-ref-maplin-4-0[4]

Key switches have been used for a variety of purposes, up to and including the launch of nuclear missiles.cite-ref-dodimagery-5-0[5]

In less secure applications such as corridor and restroom lighting controls in public buildings, tamper-resistant switches with a simpler key mechanism may be used instead.cite-ref-6[6]cite-ref-7[7]

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cite-note-11. ↑ citerefmartston1998Martston, R. M. (1998-07-15). Security Electronics Circuits Manual. Newnes. ISBN 978-0-08-093854-7.

cite-note-22. ↑ citerefsafety-2017Safety), Center for Chemical Process (2017-01-06). Guidelines for Safe Automation of Chemical Processes. John Wiley & Sons. ISBN 978-1-119-35189-4.

cite-note-33. ↑ citerefschum1988Schum, John L. (1988). Electronic Locking Devices. Butterworths. ISBN 978-0-409-90125-2.

cite-note-maplin-44. ↑ "Key switches". Maplin Electronics. Retrieved 23 August 2014.

cite-note-dodimagery-55. ↑ "Simulation of a Peacekeeper missile launch". Defence Imagery. Archived from the original on 28 September 2015. Retrieved 23 August 2014.

cite-note-66. ↑ "Low-Cost Security Measures for School Facilities" (PDF). National Clearinghouse for Educational Facilities. Archived from the original (PDF) on 25 May 2012. Retrieved 1 September 2014.

cite-note-77. ↑ "Product Bulletin for 30 Amp AC Toggle Switches". Leviton. Archived from the original on 6 April 2023. Retrieved 1 September 2014.