What is KEY SWITCH?

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What does KEY SWITCH mean? KEY SWITCH meaning - KEY SWITCH definition - KEY SWITCH explanation. What is the meaning of KEY SWITCH? What is the definition of KEY SWITCH? What does KEY SWITCH stand for? What is KEY SWITCH meaning? What is KEY SWITCH definition?

Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.

A key switch 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.

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

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.