Allen-Bradley 801-ASN21 Roller Lever Limit Switch

Allen-Bradley 801-ASN21 is a general-purpose limit switch with a roller-lever actuator and two normally open (NO) contacts. It uses a snap-action, spring-return mechanism and comes in a Type 2 housing style with Arrangement N for the contact set. The 801 family is described as general-purpose limit switches designed for a wide range of industrial position-sensing tasks, and this model’s roller lever provides reliable actuation from moving parts. The two NO contacts deliver crisp switching signals for control circuits, and the device resets automatically with its spring-return action. Actuation travel to operate is specified up to 25 degrees, with overtravel of at least 30 degrees, aligning with standard 801-series specifications for roller-lever, snap-action switches. This model is a staple within Allen-Bradley’s limit-switch lineup and is commonly used where a compact, robust end-of-travel or position-detection switch is required in automated machinery.