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.
- v
- t
- e
- Analogue switch
- Banyan switch
- Battery isolator
- Cam switch
- Centrifugal switch
- Company switch
- Contact protection
- Crossbar switch
- Crossover switch
- Cryotron
- DIP switch
- Dry contact
- Electric switchboard
- Float switch
- Half-moon switch
- Humidistat
- Infinite switch
- Inertial switch
- Kill switch
- Key switch
- Knife switch
- Limit switch
- Latching switch
- Light switch
- Lightning switch
- Magnetic proximity fuze
- Magnetic starter
- Magnetic switch
- Mercury switch
- Miniature snap-action switch
- Motion-triggered contact insufficiency
- Nintendo Switch
- Optical switch
- Photoswitch
- Piezo switch
- Placebo button
- Pull switch
- Push switch
- Push-button
- Railroad switch
- Reed switch
- Rotary switch
- Sail switch
- Sea switch
- Sense switch
- Silicone rubber keypad
- Softswitch
- Spark gap
- Staircase timer
- Stepping switch
- Strowger switch
- Thermostat
- Time switch
- Touch switch
- Transfer switch
- Vacuum switch
- Vandal-resistant switch
- Wireless light switch
- Zero speed switch
This electronics-related article is a stub. You can help Wikipedia by expanding it. |
- v
- t
- e