The SD-4WPCBT is the drop-in replacement PCB and photoelectric sensor assembly for Kidde's SuperDuct SD-4W four-wire duct smoke detector. It ships with the sampling tube gasket and uses terminal block connections for field wiring, making it the right part when the existing detector housing and sampling tubes are still good but the electronics need replacing.
When to use this part
Swap the PCB instead of the full detector when the SD-4W housing and duct sampling tubes are intact. The terminal block version (SD-4WPCBT) matches detectors originally wired with screw terminals. If the original install used RJ45 interconnects, order the SD-4WPCBJ instead.
What's included
- Replacement PCB with photoelectric sensor: restores detection capability without replacing the full housing
- Sampling tube gasket: maintains the air seal between the PCB and the detector chamber
- Terminal block connections: matches four-wire field wiring to the existing panel circuit
Compatibility
Fits all SuperDuct SD-4W series four-wire duct smoke detectors. Verify the interconnect type before ordering - terminal block (SD-4WPCBT) or RJ45 (SD-4WPCBJ).
What's the difference between the SD-4WPCBT and SD-4WPCBJ?
Does this include the sampling tubes or housing?
Will this fit a two-wire SuperDuct detector?
Does the replacement PCB require reprogramming after install?
Spec Sheet
