Kidde SD-4WJ SuperDuct Replacement PCB 4-Wire Sensor Kit

Get duct smoke protection back online fast with the Kidde Commercial SD-4WJ SuperDuct replacement PCB 4-wire sensor kit. Designed as a direct-fit replacement for SuperDuct four-wire duct smoke detectors, this kit restores photoelectric smoke sensing and preserves in-field status LED visibility so technicians can confirm operation without disassembly. With 24 V DC compatibility and standard terminal connections, the PCB reduces service time and helps avoid extended system outages — a critical benefit for commercial security, fire detection and building management teams. The board's layout supports straightforward installation and maintenance with no special tools required, making it ideal for HVAC duct monitoring, life-safety upgrades and ongoing facility surveillance. Manufactured to Kidde Commercial quality, the SD-4WJ kit keeps your duct detection infrastructure reliable and code-compliant. Order this replacement PCB to quickly return your SuperDuct detector to service and maintain continuous monitoring across your property.

• Restores full duct smoke detection quickly — direct-fit replacement PCB for Kidde SuperDuct 4-wire detectors
• Photoelectric sensing for reliable smoke detection and reduced false alarms in HVAC ducts
• 24 V DC compatibility and standard connections speed service and minimize downtime
• Visible status LEDs and tool-free access simplify testing, troubleshooting and maintenance
• Built for commercial life-safety systems — supports building monitoring and HVAC integration