Allen-Bradley 801-ASB12 Limit Switch

Allen-Bradley 801-ASB12 Limit Switch is a general-purpose position-sensing switch in Rockwell Automation’s 801 family, designed to provide a clean, discrete signal to automation control circuits. It is used to detect the presence or absence of a machine part and to signal downstream controls, end-of-travel positions, or safety interlocks in industrial equipment. The 801 family is documented with multiple housing styles and actuator options, and individual sub-models specify the exact combination of operator type, contact arrangement, and electrical ratings; for example, the closely related 801-ASA12 variant is described as a general-purpose switch with a roller-lever actuator, slow-action spring return, a Type 18 enclosure, and Arrangement A in standard data sheets. When selecting a model for a specific application, engineers refer to the official limit switch data sheets to confirm the required voltage, current rating, and operating torque. This model’s compatibility with control panels and automation lines makes it suitable for end-stop sensing on conveyors, presses, and packaging lines where reliable, repeatable switch action is essential.