Key switches are mechanical switches that require a key to activate. They are used to restrict access to expensive or dangerous equipment and provide added security. Traditional metal keys or electronic keys can be used, and some machines have multiple key switches for added security.
A key switch is a mechanical switch that can only be activated with a key. Keys are typically assigned to users, allowing access to controls to be restricted. The most commonly recognizable example of a key switch would be an automobile ignition. Such switches, however, are also often used in manufacturing and industrial environments.
The principle behind an industrial key switch is practically the same as the principle of an automotive one. To turn a machine on or off, a suitable key must be inserted into the switch and the switch turned. In a production environment, these switches also often provide access to other actions, such as the ability to adjust settings and speeds.
One of the main purposes of a key switch is to restrict access to the machine. Switches are often used on very expensive or potentially dangerous equipment. Operations-critical machines can also be turned on and off via a key switch.
Another major advantage of key switches is that they are virtually impossible to accidentally activate. Unlike a toggle switch or push switch that can be bumped, turning a machine on or off unintentionally, the operator of a key switch must actively insert the correct key and then turn the chamber. This makes such switches a natural choice for machines that take a long time to shut down or restart, and for critical operating equipment, such as that which controls air or power within a plant.
Often, the keys that fit such switches are traditional metal keys with a series of notches carved into one or both edges. These notches engage with departments within the switch, much like the departments of a lock. Only keys with the correct pattern or master keys made to work with a number of different switches can be used to activate the switch.
Many modern key switches, however, now use electronic keys. These switches are considerably more expensive, but have the advantage of being able to assign a specific key to a specific individual. This allows a company to track who has activated the switches at any given time.
To add a second level of security, a machine can be installed with a second, separate key switch. In these cases, the keys needed to activate each switch are different and assigned to different people. Usually, each switch must be activated in sequence. In some cases, the switches need to be turned on at the same time.
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