The Siemens 3SF3257-6XX00-0BA2 is a communication-capable position switch in a block-style housing per EN 50047, fitted with an AS-i adapter for direct bus connection. The switching function uses positive opening (per IEC 60947-5-1), meaning the NC contact is mechanically forced open when the actuator is displaced — no spring reliance. That matters for safety circuits where a welded contact must not go undetected. Rated IP65, the molded-plastic enclosure handles washdown and dusty environments on conveyors, packaging lines, or machine guarding stations. The separate actuator design (actuator ordered separately) lets you match the operating head to the cam or flag profile on your machine. Connection is via AS-i insulation displacement method — no screw terminals on the switch body. The flat cable pierces into the adapter, which keeps the wiring tidy on a long AS-i drop line. One NC contact is built in; no NO contacts on this variant.
Integration Notes
Mounts via screw fixing (two M4 or equivalent) to a flat machine frame or bracket — no DIN rail. The block housing per EN 50047 is a standard 30 mm wide form factor, so it shares the same footprint as conventional limit switches from the same standard. Operating temperature range from -25 to +60 °C covers most indoor industrial environments. The AS-i adapter is factory-integrated; no separate module to purchase. The switch communicates on the AS-i bus at the standard baud rate, reporting its NC state and receiving no output commands (it is a sensor, not an actuator). The reference code per IEC 81346-2 is B.