The 803-P7X Rotating Cam Limit Switch is a Style P Heavy Duty Circuit Control device from Allen-Bradley that is used with industrial machines that have repetitive cycles of operation in a process where machine motion correlates to shaft rotation. The 803-P7X is built for long-life/heavy-duty industrial operations like packaging and assembly, steel forming, and injection molding operations. The device utilizes a shaft-mounted cam mechanism, and it produces contact actuation as the shaft rotates. It has a cam-opened N.C. contact circuit, with a ball bearing rotating shaft that has a 400 RPM base shaft speed, and a spring-loaded cam roller assembly. The 803-P7X also comes with 7 cam assemblies with adjustable lobes and valleys, and it has a slot (keyway) on the rotating shaft, which connects the shaft to machines. Its N.C. contact has a carrying current of 25 A, with a MAKE/BREAK AC contact rating of 30A to 3A at 600 Volts AC, and a power rating of 18VA.

The 803-P7X has 7 cam assemblies that have adjustable lobes and valleys, and the circuit activates when the lobes brush against the cam-roller, opening the N.C. contact, and it deactivates when the valley passes by the cam roller. It has a dwell time corresponding to the total activation period, and which is determined by the length of the cam lobes, and the dwell time can be either at the maximum or the minimum depending on the angular alignment of adjacent cam lobes. The 803-P7X has a timing measured in degrees, which is determined by the position of the cam relative to the keyway, and it has a cam duration range of 11 degrees to 349 degrees. It has an internal dwell time and timing adjustments and both settings determine the machine’s operations, and it has a factory-customized double shaft extension. It has a NEMA Type 1 indoor enclosure, with a working temperature range of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), and a storage range of -30 to 93 degrees Celsius (-22 to 200 degrees Fahrenheit). The 803-P7X device weighs about 12.2 kilograms (27 pounds) with a total shipping volume of 354.1 x 181 x 138.1 millimeters (13.94 inches x 7.13 inches x 5.44 inches), and it is CE, CSA, and UL certified.