Siemens 3SB3 647-0AA31 Illuminated Momentary Push Button

Siemens 3SB3 647-0AA31 is an illuminated momentary push button from the SIRIUS 3SB3 family, designed for panel mounting in control enclosures. The 40 mm diameter device includes built‑in illumination and a momentary action that returns to the rest position when released, making it well suited for start/stop and signaling functions in industrial automation. It’s listed within Siemens’ commanding and signaling devices lineup and is compatible with matching 40 mm holders; the 3SB3 family includes multiple color/configuration options (for example 3SB3 00-0AA11, 01-0AA31) to suit different indication needs. The order code 647-0AA31 identifies this illuminated-momentary variant within the 3SB3 series, commonly deployed on machine control panels and process automation interfaces where a clearly visible user input is required.