Allen-Bradley 855T-B10SA3 is a 70 mm control-tower sound module (single-tone piezo style) designed for UL Type 4/4X/13 installations on 70 mm control tower stack lights. It operates from 120 V AC at 60 Hz (110 V AC at 50 Hz) and provides a selectable audible level of 107 dB at high or 92 dB at low at 1 m, with continuous or pulsing tones configurable via a DIP switch. The black housing measures 69.5 mm in diameter and is rated IP65 (NEMA 4/4X/13); it supports a 0.8 Nm terminal torque, 0.5 mm² wire size, a lamp life of 20,000 hours, operating temperature down to -25 °C and storage down to -40 °C, and tolerates leakage currents up to 3 mA from solid-state outputs.
