What is the Difference between isolator and functional switch?

An isolator is a device used to ensure the safety of maintenance personnel by completely disconnecting a circuit from its power source, typically providing a visible break in the circuit. It is often used in high-voltage applications. In contrast, a functional switch is designed to control the operation of a device or system, allowing it to be turned on or off during normal operation without necessarily providing a complete disconnection from the power source. Essentially, isolators prioritize safety and maintenance, while functional switches focus on operational control.