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]
 On/off key switch | |
| Working principle | Switch |
|---|---|
| Electronic symbol | |
.svg) | |
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
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- ^ 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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