Key switch

Key switch
	On/off key switch
Working principle‍	Switch
Electronic symbol

A key switch (sometimes called a keyswitch or lock switch) is a key-operated switch.^[1] Key switches are used in situations where access to the switch's functions needs to be restricted.^[2]^[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.^[4]

Key switches have been used for a variety of purposes, up to and including the launch of nuclear missiles.^[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.^[6]^[7]

References

^ Martston, R. M. (1998-07-15). Security Electronics Circuits Manual. Newnes. ISBN 978-0-08-093854-7.
^ Safety), Center for Chemical Process (2017-01-06). Guidelines for Safe Automation of Chemical Processes. John Wiley & Sons. ISBN 978-1-119-35189-4.
^ Schum, John L. (1988). Electronic Locking Devices. Butterworths. ISBN 978-0-409-90125-2.
^ "Key switches". Maplin Electronics. Retrieved 23 August 2014.
^ "Simulation of a Peacekeeper missile launch". Defence Imagery. Retrieved 23 August 2014.
^ "Low-Cost Security Measures for School Facilities" (PDF). National Clearinghouse for Educational Facilities. Retrieved 1 September 2014.
^ "Product Bulletin for 30 Amp AC Toggle Switches". Leviton. Retrieved 1 September 2014.

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[1] Martston, R. M. (1998-07-15). Security Electronics Circuits Manual. Newnes. ISBN 978-0-08-093854-7.

[2] Safety), Center for Chemical Process (2017-01-06). Guidelines for Safe Automation of Chemical Processes. John Wiley & Sons. ISBN 978-1-119-35189-4.

[3] Schum, John L. (1988). Electronic Locking Devices. Butterworths. ISBN 978-0-409-90125-2.

[maplin-4] "Key switches". Maplin Electronics. Retrieved 23 August 2014.

[dodimagery-5] "Simulation of a Peacekeeper missile launch". Defence Imagery. Retrieved 23 August 2014.

[6] "Low-Cost Security Measures for School Facilities" (PDF). National Clearinghouse for Educational Facilities. Retrieved 1 September 2014.

[7] "Product Bulletin for 30 Amp AC Toggle Switches". Leviton. Retrieved 1 September 2014.

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