keyoperated

Keyoperated, often written as key-operated, describes a device or control that requires a physical key to change its state or access its function. In practice, keyoperated switches and locks are used to restrict operation of equipment, electrical circuits, or security features to authorized personnel.

Keyoperated devices come in several forms. A key-operated switch is commonly a cylindrical mechanism that, when the correct key is inserted and turned, makes or breaks electrical contacts. These switches can be latching (retaining the on or off position) or momentary (active only while the key is held or turned). They may be normally open or normally closed, depending on the circuit design. The key itself can be unique to a single device, or arranged in keyed-alike or master-key configurations to balance security and convenience.

Applications are widespread in industrial and consumer settings. They appear on machinery start/stop controls, lockable power switches on tool panels and control cabinets, security enclosures, vending or service access doors, and certain vehicle or equipment ignition systems. Effective key management—deciding whether keys are unique, shared, or part of a master system—is a critical security consideration.

Advantages of keyoperated controls include restricted access, improved safety by preventing unauthorized use, and easier accountability through controlled key issuance. Disadvantages include the risk of lost or duplicated keys, potential bottlenecks in operations if keys are unavailable, and the need for ongoing key-management procedures. Proper selection should align electrical ratings, environmental conditions, and local codes with the intended application.