Napco FWC-FSLC-ISO Short Circuit Isolator Module

Keep your fire and security monitoring systems online even when wiring faults occur. The Napco FWC-FSLC-ISO Short Circuit Isolator Module is a control panel module designed to segment and protect GEMC-FW-SLC polling loops so a single short won’t disable the entire loop. By automatically checking the S-SC line at power-on and isolating a shorted segment, this module preserves surveillance and alarm continuity — reducing false alarms, downtime and costly service calls.

Engineered for installers and system integrators, the isolator can be placed at any point on the S-SC line for maximum flexibility. A yellow LED provides instant visual confirmation of a short, simplifying troubleshooting. Built to UL864 9th Edition and NFPA 72 standards, the unit supports compliant fire alarm and security control panel configurations. Manufactured in the US and housed in a high-visibility yellow enclosure, it’s easy to locate within control cabinets.

Ideal for commercial security, fire alarm, and surveillance installations, the Napco FWC-FSLC-ISO improves reliability and uptime — add it to your next control panel upgrade or maintenance kit to harden monitoring systems.

• Prevents a single short from disabling the entire GEMC-FW-SLC polling loop, maintaining continuous security and monitoring
• Installs anywhere on the S-SC line for flexible placement and minimal reconfiguration of existing control panel modules
• UL864 9th Edition and NFPA 72 compliant for reliable fire-alarm integration and code-aware system design
• Automatic line check at power-on with yellow LED short-circuit indication for fast diagnostics and reduced service time
• Compact, high-visibility yellow housing made in the US to simplify identification and speed maintenance in the field