SD-651 Low Profile Plug-In Smoke Detectors


Operating Voltage/Alarm Current: See Adapter Base Selection Guide following
Standby Current: 85μA Standby
Sensitivity: 1 – 3.18%/ft.
Height: 2.0” in B401
Diameter: 4.1” installed in B401; 6.1” installed in B110LP
Shipping Weight: 5.2 oz
Construction: Flame retardant thermoplastic
Temperature: Photo: 32°F to 120°F (0°C to 49°C)
UL Listed Velocity Range: Photo: 0–3000 fpm (0–15.2 m/s)
Humidity Range: 10%–93% RH non-condensing
Smoke Detector Spacing: On smooth ceilings (as defined in NFPA 72), spacing of 30 feet (900 sq. ft.) may be used as a guide. Other spacing may be used depending on ceiling height, high air movements, and other conditions or response requirements.


The Notifier SD-651 Plug-in Smoke Detectors offer superb performance and reliability in a profile which is just 2” (5.1 cm) deep. Model SD-651 (photoelectric sensor) can be used with a variety of different adapter bases in several wiring configurations and voltages. Other features include: low current draw, stable performance in high air velocities, built-in tamper resistant base design, remote LED option, removable cover, and built-in test switch.
The SD-651 is designed to meet the performance criteria designated by UL. Its sensing chambers are sealed against back pressure air flow, dirt, and insects. This chamber is pro-tected by a fine mesh screen which can be cleaned or replaced. Additional key features include a variety of mounting bases and a full line of accessories.
SD-651 photoelectric smoke detectors contain a unique optical sensing chamber designed to sense smoke particles produced by a wide range of combustion sources. A custom integrated circuit incorporates signal processing to reduce false alarms.

Model SD-651 photoelectric detector’s unique optical sensing chamber is engineered to sense smoke by a wide range of combustion sources.