Allen-Bradley 855BS-N20RH4 Rotating 90mm Round Beacon

Allen-Bradley 855BS-N20RH4 is a 90 mm round industrial beacon that provides rotating red signaling for machine status, safety alerts, and process signaling in rugged environments. It operates from 240V AC at 20 W and uses a GY6.35 lamp holder, with rotation selectable between 90 rpm and 180 rpm via a jumper. The red lens pairs with a polycarbonate housing, and replacement parts include a smooth red replacement lens and halogen lamps. The unit weighs about 378 g and is designed for vertical-surface mounting with a bracket for indoor and outdoor use; for horizontal mounting outdoors, an additional metal plate between surface and base may be used. It carries IP65 protection and a NEMA rating of 4/4X/13, reflecting its rugged sealing for demanding environments. Common applications include signaling on control panels, on machines along manufacturing lines, and other industrial safety signaling roles.