SYSTEM SENSOR B224RB-WH

Product Overview

 System Sensor Select Series detector bases include standard 4" and 6" models and specialty options such as relay, isolator, sounder, and low-frequency sounder bases. Standard plug-in bases feature screw terminals for power (+/−) and remote annunciator connections, with system communication carried over the power wiring. The 4" base is compact, while the 6" base fits a wider range of junction boxes.

Specialty bases use a separate mounting plate compatible with multiple box sizes, allowing pre-wiring, faster installation, and a cleaner appearance.

Relay bases (B224RB-WH/B224RB-IV) provide a single Form C relay for auxiliary functions like door release and elevator recall, with short-delay (60–100 ms) or long-delay (6–10 s) selectable via a shunt.

Isolator bases (B224BI-WH/B224BI-IV) maintain SLC operation during short circuits by isolating affected sections and automatically restoring the loop.

Sounder and low-frequency bases suit new and retrofit installations, meeting UL 268/464 and NFPA 72 requirements. 

Key Features

• Plug-in bases allow fast and secure detector installation
• Mechanical locking feature prevents unauthorized removal of the detector head
• Multiple base configurations support a wide range of application requirements