Mechanical robust door interlock for safety accesing machine areas, gates or hatches. - Can be used in Category 4 (EN 954-1) applications - Pattented runner bar system - Safety key to prevent accidental lock in of personnel - Available in full stainless steel - Suitable for use in ATEX zone 1 and 2 - No wiring on the installation Can be used in combination with Fortress (solenoid controlled) key switches and key exchange boxes.