Grinnell 900RBA 515591 99074 Fire Detector Relay Base

Grinnell 900RBA Fire Detector Relay Base, part numbers 515591 and 99074, is a mounting base designed for use with Grinnell fire detectors that require a relay interface to the building's fire alarm system. This base provides secure mechanical support for the detector assembly and establishes the electrical connections that carry alarm signals from the detector to the fire alarm control panel. By housing the detector’s relay circuitry within a dedicated base, it helps simplify wiring, reduce installation time, and maintain proper spacing and alignment for reliable operation. The 900RBA designation identifies this component as part of Grinnell’s line of detector bases and accessories, intended for use in commercial or institutional fire protection installations where relay outputs are needed to drive signaling or control circuits. Ensure compatibility with your Grinnell detector model and follow all applicable installation standards and local codes.