Which of the following is NOT considered a safety device for robots?

The identification of power switches as not being considered a safety device for robots stems from their primary function. Power switches are essential for turning the robotic system on or off but do not serve to prevent accidents or injuries during operation. Safety devices, on the other hand, are specifically designed to protect workers and ensure safe interaction with robotic systems.

Light curtains act as a protective barrier that can stop or prevent the operation of a robot when an object or person interrupts the light beams, thereby safeguarding individuals from potential hazards. Safety mats work similarly, providing a cushion that can halt robot activity when someone steps on them, further enhancing the workplace's safety. Barricades are physical barriers that can prevent access to dangerous areas where robots operate, preventing unintentional entry by workers.

Each of the other items plays a direct role in ensuring safety during the operation of robotic systems, whereas power switches focus on the operational control of the robots rather than actively contributing to a safe environment.