key-operated switch is a switch that is activated or deactivated by the insertion and turning of a key.

A key-operated switch, also known as a key switch, is a type of switch that requires the use of a key to control its operation. It typically consists of a switch mechanism and a key slot. To operate the switch, a specially designed key is inserted into the key slot and turned to either activate or deactivate the switch. 

The switch can be used for various purposes, such as controlling power to a device or system, enabling or disabling security features, or granting access to certain areas or equipment. The key-operated switch provides an additional level of security by requiring the physical presence of the key in order to control the switch.