Siemens 3SB3644-6BA20 is a 22 mm metal round indicator light (pilot light) with concentric rings on the bezel and an integrated LED, designed for panel mounting in 24 V AC/DC circuits. The complete unit includes a lampholder and holder, with a screw-terminal connection for wiring. Operating at 24 V AC/DC, it emits red illumination when energized, making it suitable for status signaling on control panels, automation equipment, and safety interlocks in industrial environments. At 22 mm in diameter, the unit fits standard 22 mm indicator cutouts and leverages a rugged metal housing for durability in demanding environments.
