A key switch (sometimes called a keyswitch or lock switch) is a
key-operated
switch
In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type o ...
. Key switches are used in situations where access to the switch's functions needs to be restricted.
Key switches are available as
components
Component may refer to:
In engineering, science, and technology Generic systems
*System components, an entity with discrete structure, such as an assembly or software module, within a system considered at a particular level of analysis
* Lumped e ...
with solder connections, and are available with a variety of
ampere
The ampere ( , ; symbol: A), often shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 c ...
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
Nuclear weapons delivery is the technology and systems used to place a nuclear weapon at the position of detonation, on or near its target. All nine nuclear states have developed some form of medium- to long-range delivery system for their nuc ...
.
In less secure applications such as
corridor and restroom lighting controls in public buildings,
tamper-resistant switch
Tamperproofing is a methodology used to hinder, deter or detect unauthorised access to a device or circumvention of a security system. Since any device or system can be foiled by a person with sufficient knowledge, equipment, and time, the term " ...
es with a simpler key mechanism may be used instead.
References
Switches
Locksmithing
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