Siemens 3SB3646-0AA21 Push Button Illuminated

Siemens 3SB3646-0AA21 is a 22 mm metal-round complete-unit illuminated pushbutton with a flat red actuator, engineered for momentary contact operation and wired via screw terminals. The pushbutton includes an integrated LED that lights the front of the button when powered by 24 V AC/DC, and it comes with a mounting holder for secure installation in a 22 mm panel cutout. This 1NC device features a single normally closed contact configuration and a robust metal housing with a dedicated front ring, making it suitable for rugged industrial environments. Ideal for control panels, start/stop circuits, indicator signaling, and status feedback in automation systems, the 3SB3646-0AA21 provides immediate visual feedback and a compact, serviceable form factor. The unit is designed as a complete pushbutton assembly, simplifying replacement and field wiring in 24 V control circuits, and aligns with Siemens' 22 mm pushbutton family for standardized panel installations.