The ProLine and ProLine G2 Mechanical Interlock can be actuated by any ProLine or ProLine G2 solid or disconnect door in a multiple-bay enclosure system. Up to ten doors, including window doors, can be interlocked. The interlock device engages the door at the center to provide maximum security. The Primary door can be positioned in any location. Only after the Primary door is opened can Secondary doors be opened. The interlock system is modular and easy to assemble.