The 803-PL6 Rotating Cam Limit Switch with a Less Operator Cam Option is a heavy-duty circuit control device by Allen-Bradley used with industrial machinery with repetitive operation cycles in a process where machines motion correlates with shaft motion. The device is suitable for long-lived industrial heavy operations like assembling and packaging, steel forming, injection molding, and punch press applications, and like all Bulletin 803 Devices, it makes use of a shaft-mounted cam switch. It comes with 6 normally closed (NC) contact circuits, with a contact base-mounted spring-loaded cam roller, and with a 400 RPM-rated rotating shaft with over-sized ball bearings. The 803-PL6 also has 6 or fewer cam assemblies with adjustable lobes and valleys and when the shaft rotates, the cam actuates contact by brushing the lobes against the cam-roller assembly, opening the NC contact. The circuit is de-activated when the valley passes through the cam-roller, and the activation period (dwell time) is determined by the size of the cam lobes.

The cam can achieve maximum dwell time when the adjacent lobes offset at a maximum angle, and it produces the minimum dwell time when the lobes align perfectly. It has a timing measured in angular degree, which is determined by the position of the cam relative to the Top Dead Center, and the 803-PL6 has a timing duration range between 110 and 3490. Like all Style P devices, the 803-PL6 has a standard right shaft extension, with high-speed, low-cost internal dwell and timing adjustments. it is encased in a NEMA 1 rated enclosure, and it has operating temperature limits of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), with a storage level of -30 to 93 degrees Celsius (-22-200 degrees Fahrenheit). It weighs approximately 8.2 kilograms (18 pounds), and it has shipping dimensions of 284.1 x 181 x 138.1 millimeters (11.18 x 7.13 x 5.44 inches).