The Simplex 677-202 is a legacy interface module used within older Simplex fire alarm control panel assemblies, supporting service and retrofit work on installed systems that predate the current IDNet2 addressable platform.

Compliance

• Designed for use within UL 864 listed Simplex fire alarm control panel assemblies
• NFPA 72 National Fire Alarm and Signaling Code installations
• FM Approved system context (panel dependent)

Key features

• Board-level interface component for legacy Simplex panel configurations
• Intended for retrofit, repair, and like-for-like board replacement in installed systems
• Supports continuity of existing fire alarm infrastructure without a full panel migration
• Mounts within the host panel chassis using the original board position and connectors
• Specified by Simplex part number to match the panel revision in service
• Used in commercial and institutional buildings where the original Simplex platform remains active

This part belongs to the earlier generation of Simplex panels that preceded the 4100ES and 4010ES platforms. These systems were built around conventional and early addressable signaling line circuits, and individual interface boards handled communication, monitoring, and control functions on a modular chassis. Replacing a board rather than the full panel lets facilities extend the service life of an installed system that remains code compliant.

Verify panel and device family compatibility before ordering.