Siemens 3SF3120-1CV00-0BA1 Position Switch with ASI-F-Adapte

The Siemens 3SF3120-1CV00-0BA1 is a position switch with an integrated ASI-F-adapter, carrying a single NC snap-action contact. The overtravel plunger is metal, and the body width is 40 mm — a compact footprint for guard-door or limit-switch positions on a machine frame. The ASI-F-adapter means this switch connects directly onto an AS-Interface safety network, so it reports the NC contact state back to a safety monitor without a separate I/O block. That saves a cabinet terminal and a wiring run per switch.