Siemens 3SE2 404-1GW Position Switch With Roller Crank

Siemens 3SE2 404-1GW Position Switch With Roller Crank is a metal-enclosed, 40 mm wide limit switch designed to provide reliable position signaling in automated systems. It features four contacts—two normally open and two normally closed (2NO + 2NC)—with snap-action operation for crisp, fast switching. The unit uses a roller-crank actuator (roller crank with a plastic shaft) that can be offset on the drive shaft and rotated to align with the mechanical linkages, and it is designed for mounting in control panels or directly on machinery. As part of the 3SE2 family, the switch supports positive-opening action on the contacts, an important trait for safety-related signaling in control circuits. The 404 variant is commonly used in conveyors, presses, clamps, and other equipment where compact, robust signaling is required to feed signals to PLCs, interlocks, or safety circuits. Note that distributors list this model as discontinued by the manufacturer, so existing inventory or replacement 3SE-family variants may be the practical source for repair or retrofit.