A key switch, also known as a key lock switch, is a secure control device that restricts access to systems and equipment using a physical key mechanism. Commonly used in vehicles, industrial machines, and access control systems, it enhances security, prevents unauthorized use, and ensures operational safety. This guide explains how key switches work, their types (rotary, push-button, barrel), and key applications across industries. Learn why choosing the right key switch lock is essential for reliable system protection and improved efficiency.