Safety switch with integrated AS-Interface and LED indication
The Siemens 3SF1234-1QV40-1BA1 is a SIRIUS mechanical safety switch designed for guard-door and hazard-zone monitoring. It carries two normally-closed positive-opening safety contacts and communicates over AS-Interface with slave profile 0.B.F. The 24 V LED gives a quick visual on supply and actuator status — saves time during a midnight startup when you're tracing a missing safety chain.
IP65 enclosure and mounting flexibility
Rated IP65, so it handles washdown and dusty environments on packaging or food lines. The block plastic housing mounts with screw fixing in any orientation. Width is 31 mm — fits a standard DIN-rail footprint if you use an adapter plate; the M12 fixed plug keeps wiring clean and tool-free.