The FG40-30 is a compact roll-off protection with electrical contact that has been specially developed to prevent an unbalanced door from rolling uncontrollably due to a mechanical defect. After activation of the roll-off protection, it cannot be reused and must be replaced. A red pin indicates the status of the roll-off protection. The electrical contact must be connected to an emergency stop of the relevant control to ensure that the drive stops immediately when the roll-off protection is activated.