The 803-NK36 is a Bulletin 803 Cam Kit for Rotating Cam Limit Switch manufactured by Allen-Bradley. The 803-NK36 package includes two cams and mounting hardware for one circuit. The kit includes two moon-shaped pieces of the cam assembly (cam segments), three screws, three screw nuts, three spacer washers and instruction manual with technical data. This kit is used to form cam assembly for the rotating cam limit switch. These cam elements are designed to have high position part – lobe, and low position part - valley. The cam assembly operates contacts (the lobe pushes against the cam-roller assembly) inside the rotating cam limit switch while rotated along with a shaft on which it is mounted.

This device is coupled with industrial machines to detect their rotating movement and provide control feedback.To adjust timing (angular position), shift both cam elements along their slotted holes to the desired position. To adjust dwell (angular travel), fan-out the cam elements with respect to each other. When adjusted, cam elements should be locked with nuts. This assembly’s NC (Normally Closed) contact opens to 48 or 69 degrees, while the NO (Normally Open) contact remains closed from 291 to 312 degrees. Ensure that the cam element lobes overlap enough to provide continuous cam edge, in order to guard against unintended contact operation. Additionally, both cam elements should be pushed down and firmly seated against shaft assembly in order to avoid the unpredictable operation and/or possible damage to the rotating cam limit switch unit. The Allen-Bradley 803-NK36 reached its end of production on October 31, 2007