)
On/off key switch
A key switch (sometimes called a lock switch to distinguish it from a keyswitch) is a switch that can be activated only by the use of a key. They are usually used in situations where access needs to be restricted to the switch's functions.
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.[1]
Key switches have been used for a variety of purposes, up to and including the launch of nuclear missiles.[2]
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.[3][4]
References
- ^ "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.