Allen-Bradley 855E-B20SA3 Sound Module

Allen-Bradley 855E-B20SA3 Sound Module is the audible signaling component for 50 mm Allen-Bradley Control Tower Stack Lights, designed to be mounted on a 50 mm base and energized by 240 VAC. The SA3 designation represents a single-circuit, single-tone piezo-style module that can emit either a steady or pulsing tone via DIP-switch configuration. In conjunction with compatible 855E stack-light bases, it delivers an approximate 88 dBA sound output at 1 meter, providing clear alerts in noisy industrial environments. This sound module is black in housing color and is intended for use where compact, integrated audible signaling is required directly from the stack-light assembly, helping operators quickly identify machine status, faults, or process events. Typical applications include production-line alerts, safety signaling, and status indications on automated equipment, with the advantage of reducing wiring complexity by integrating the audible tone directly into the 855E signaling stack. The 855E-B20SA3 is part of Rockwell Automation’s signaling family, designed to pair with standard 240 V AC 50 mm stack-light bases and other module types in the 855E/855T family, offering a simple, robust audible alert option for industrial control panels and machine panels.