Which component helps prevent users from entering the escalator when it is not running?

The component that helps prevent users from entering the escalator when it is not running is the safety gates. Safety gates are designed to provide a physical barrier that restricts access to the escalator until it is in operation. When the escalator is not running, these gates typically remain closed, ensuring that individuals cannot inadvertently step onto the escalator platform, which could lead to accidents or injuries.

Handrails, while important for user support and safety during operation, do not prevent access when the escalator is not in use. Foot sensors may help detect user presence and stop the escalator if there is an obstruction, but they do not physically prevent access. Emergency stop buttons are vital for user safety during operation and can halt the escalator, but they do not act as a barrier to entry when the escalator is off. Thus, safety gates play a crucial role in ensuring that individuals do not enter the escalator platform before the escalator is operational.