Type D entrapment protection refers to which kind of device?

• A. A device that requires continuous pressure to maintain opening or closing motion, and is within line of sight
• B. A monitored non-contact sensor
• C. A force-limiting clutch
• D. A foot pedal interlock

Answer: (A)

Type D entrapment protection is the hold-to-run device—something the operator must continuously press to keep the gate moving, and it has to be placed so the operator can see the area where entrapment could occur. The idea is to keep the operator in direct control and able to stop immediately if a person or object is in the path. This differs from automatic, non-contact sensors that stop on their own, or from force-limiting mechanisms that reduce impact without requiring ongoing operator input. A foot pedal interlock is a different kind of control that isn’t defined by the continuous pressure, line-of-sight requirement, and active hold-to-run behavior that characterizes Type D.