is where it is supposedly safe for a person to work with and in close proximity to a robot arm. This however is illusionary. A robot that is tuned to stop on impact may not be safe. For a start, any mass in motion needs time to stop; it's a law of physics (Newton's first law). Robots where the trip torque can be set at low thresholds are too slow for any practical industrial application. Where you see a video of a robot bumping into a person, then stopping, the collision is always in open air. If the same robot traps your hand between its end effector and the bench it will hurt you. Any robot carrying an end effector or payload of any mass at any practical speed is a hazard and it will hurt you no matter what label you put on it.
ST Robotics Workspace Sentry: collaborative robotics safety system
ST has a robot and area safety system based on sensors that can be strategically positioned around the shared workspace. When the user gets within a set distance the robot stops with enhanced deceleration. This is considerably safer than a robot that simply stops on contact. However, a risk assessment should always be carried out.