The Simplex 742-346 is a cable harness for Simplex fire alarm control panels, providing the factory interconnect between boards, modules, or assemblies inside the panel chassis.

Compliance

• Designed for use within UL 864 listed Simplex fire alarm control panel assemblies
• NFPA 72 National Fire Alarm and Signaling Code installations
• Built to the harness routing and connector pinout of the host Simplex panel

Key features

• Pre-terminated cable harness for internal Simplex panel interconnect
• Keyed connectors matched to the original board and module positions
• Carries power, communication, or signal lines between panel assemblies
• Specified by Simplex part number to match the panel revision in service
• Intended for repair and like-for-like replacement of a damaged or aging harness
• Routes within the panel chassis along the original cable path

Internal harnesses tie together the boards and modules of a Simplex panel, carrying the power and communication lines that the card cage relies on. Because connector keying and pinout are specific to a panel revision, the harness is matched by part number rather than substituted generically. Replacing a worn or damaged harness restores the factory interconnect without disturbing the surrounding boards or the panel listing.

Verify panel and device family compatibility before ordering.