A key lock switch is a type of switch that is used to control access to a piece of electrical equipment or a specific area. The switch is normally mounted onto a wall or door and has a lock and key mechanism built into it. When the key is inserted and the switch is activated, the switch is opened and allows access to the electrical device or area. When the key is removed and the switch is deactivated, the switch shuts and prevents access. Keylock switches are commonly used in areas such as hospitals, banks, and other areas that require controlled access.