Allen-Bradley 855T-B24SA2 Stacklight Base

Allen-Bradley 855T-B24SA2 Stack Light Base is a 70 mm control-tower sound module intended for use with Rockwell Automation 855T stack-light assemblies. It provides a single-tone piezo sounder with continuous or pulsing tones, adjustable via DIP switch, delivering 97 dB at 1 meter in high-volume mode or 85 dB in low-volume mode. The module operates at 24 V AC/DC (±10%), draws about 45 mA at 24 V, and has a black housing with an outer diameter of 69.5 mm. It carries an IP54 enclosure rating and a NEMA 12 rating, making it suitable for typical industrial environments. Lamp life is rated at 20,000 hours, and the tone is adjustable. The 855T-B24SA2 is part of the discontinued 855T family; Rockwell notes that as of October 1, 2019, the 70 mm Sound Module Stack Lights were discontinued and replaced by the 856T-BP1.