Key switch

Key switch and key switch are electrical switches that are combined for security with a lock. The switching process can therefore be carried out by an authorized personnel with the assistance of the appropriate key.

A key switch is used to trigger a pulse, about the selection of the floor in an elevator, the key can be removed only in one position here.

When a key switch, the key can engage in two or more positions are usually deducted in each detent position and is used to set a switching state, such as a sliding door ( open, closed, only output, automatic). Pressing a key switch is sometimes referred to as keys.

The purpose is usually the protection of critical, particularly worthy of protection switching. Examples:

• Starting of a motor vehicle ( ignition )
• Operation of potentially dangerous equipment (eg, trash compactor )
• Turning on a circuit in the laboratory
• Resetting an emergency stop
• ( Dis) arming an alarm system
• (Preferred ) control of elevators
• Deportation against an access control system or its control (eg door operator )
• Pressing special lights by drivers in public transport

Related to the key switches are card reader, which can be found at many banks. To this end, you put the card into the slot on the reader and can then open the door. Similar in purpose to fulfill the iris or fingerprint scanner ( biometrics).