System Sensor B402B Automatic Fire Alarm Detector Base

The System Sensor B402B automatic fire alarm detector base is a two-wire mounting and electrical interface designed for System Sensor smoke and heat detectors in commercial fire alarm and life-safety systems. It is intended for indoor use in offices, schools, and industrial facilities, and supports surface or electrical box mounting with screw-terminal connections for wiring. The base uses flame-retardant thermoplastic housing and accepts 3.5-inch or 4-inch junction boxes, serving as the detector mounting platform and electrical interface within fire alarm networks. Maintenance teams and system integrators rely on the B402B for retrofit, repair, expansion, or replacement of detector assemblies, ensuring consistent power and signaling connections. Part number B402B, from System Sensor, is compatible with System Sensor smoke and heat detectors and is designed specifically for fire alarm and smoke detection systems in commercial settings.