What safety mechanism prevents an elevator from free-falling?

The over-speed governor is a critical safety mechanism designed to prevent an elevator from free-falling. It functions by monitoring the speed of the elevator car as it descends. If the governor detects that the elevator is moving at an unsafe speed—such as would occur in the event of a cable failure—it activates a safety system that triggers the brakes to engage. This action slows down or halts the elevator, ensuring that it does not fall uncontrollably.

This safety device is essential for the protection of passengers and the integrity of the elevator system. The over-speed governor is part of a comprehensive safety system that includes various other components, but its specific role is vital for preventing rapid descent, which could lead to dangerous situations.

Other options, while they have their specific functions in elevator safety, do not directly prevent free-fall in the same manner as the over-speed governor. For instance, a manual brake is typically used for holding the elevator in place when not in operation, rather than for responding to over-speed conditions. Control panel lockdown refers to systems that restrict access to the controls, while a mechanical lock may keep the doors secure. Each of these serves important roles, but none directly intercept the rapid descent of an elevator caused by malfunction, which is the