Fit on a guarding or position-feedback line
The 3SE5122-0BE01 is a SIRIUS mechanical position switch in the block-wide metal housing with a roller-lever actuator and a positive-opening contact function that conforms to EN 50041, so it carries the documented force-displacement relationship required for guard-door interlocks and cam-actuated end-of-travel stops. Positive opening is the load-bearing detail here: the contact is mechanically forced open by the actuator travel, independent of spring return, which is what the EN 50041 / IEC 60947-5-1 positive-opening spec exists to certify on a safety-rated position switch.
What the ratings tell the panel builder
Repeat accuracy is 0.05 mm, which is the figure that decides whether the switch holds its trip point across millions of cycles on a high-repetition machine; the contact mechanism is slow-action, so the make/break is not bounce-sensitive the way snap-action switches are. Mechanical shock rating is 30 g / 11 ms per IEC 60068-2-27, paired with an IP66/IP67 sealing and a cathodic dip-coated metal enclosure, which together let the body survive washdown and the impulse loads seen on presses, packaging lines, and outdoor conveyor skids without corroding through at the gland plate. Operating temperature spans -25 to +85 °C with a storage envelope of -40 to +90 °C, so an unpowered spare on the shelf stays within spec for a maintenance float, and a unit mounted near a hydraulic manifold or furnace-skid housing stays within its switching envelope on the hot side.
Mounting and wiring at the gland plate
Fastening is screw-fixing in any mounting orientation, and the pollution degree is class 3, which is the rating for industrial environments with conductive contamination present — the kind of duty that needs the IP66/IP67 sealing at the cable entry rather than just at the body face. The actuator head is a metal lever with a plastic roller — the roller is the consumable surface that takes the cam or dog impact, so it is the part to specify as a replacement item on a long-running line rather than the switch body itself.