What does ISO 3691-4 actually cover?

The standard describes how to design a mobile robot for safe operation, covering both hardware (such as obstacle detection and safety bumpers, and emergency stop placement) and operational or software-level design requirements.

Who is responsible for compliance?

ISO 3691-4 defines shared responsibilities between OEM manufacturers, integrators, and end users — each has a role in keeping the deployed system compliant, not just the robot manufacturer alone.

How does this relate to a specific installation?

As with cobot installations, a site-specific safety audit is how these requirements get confirmed for your actual layout, rather than assumed from the equipment spec alone.