The Siemens 3SF5814-2A. is an AS-Interface enclosure for command devices — a 22 mm round metal housing with a gray top part, designed to hold up to 4 control points. It is a mounting platform for pushbuttons, selector switches, or indicator lights in an AS-Interface network, not a standalone switch or sensor. The round 22 mm installation opening and vertical/horizontal fastening method mean it integrates into standard control-panel cutouts or machine enclosures where a compact, metal-bodied command station is needed.
The 22 mm mounting diameter matches the industry-standard panel cutout for 22 mm pilot devices — the same hole size used across most pushbutton and selector switch families. That means it drops into existing panel knockouts or new enclosures without special tooling. The round opening shape and vertical/horizontal fastening give the panel builder flexibility in orientation. This enclosure does not carry an EMERGENCY STOP function and has no positive opening mechanism. For a safety-rated e-stop application, you would need a different enclosure with a positive-opening contact block. This unit is suited for standard command and indication functions within an AS-Interface segment. The metal construction provides mechanical robustness in industrial environments — better impact resistance than plastic enclosures in areas with vibration or tool contact. The gray top part is a standard industrial color, matching most Siemens command device lines.