AS 3500 is a modern three-point lock with one soft-lock latch integrated in the main lock and two hooks in the secondary locks. When the door is open, the hooks are concealed in the cassettes. This allows for obtaining elegant appearance and ensures quiet and smooth closing. When closing the door, the hooks are activated by a hardware-independent release and closed from the bottom up. This means that even a falling door can be closed easily and safely. The hooks which jam in the striker plate engage secure locking. This means that the AS 3500 automatic espagnolette can be used in door with burglary protection class WK 2.