The 803-PL2 Rotating Cam Limit Switch from Allen-Bradley is a heavy-duty control circuit device with an operator-less cam option that is used for control of heavy-duty industrial machines that have dedicated operation cycles, and for control of industrial applications where their motion corresponds to shaft motion. The device makes use of a shaft-mounted cam, which provides circuit actuation while the shaft rotates, and it is suitable for machine packaging/assembly, steel forming, and injection molding operations. The 803-PL2 comes with 2 circuits with 2 cams opened contacts, a spring-loaded cam-roller, a 150 RPM rotating shaft that over-sized ball bearings, and 2 cam assemblies that have adjustable segments. It has a normally-open circuit with 25A carrying current, and 30A/3A MAKE/BREAK AC contact ratings at 600 Volts AC, which open when the cam lobe pushes against the cam-roller assembly, and which closes when the cam valley passes through the cam-roller.

The 803-PL2 has a dwell time (duration of activation), which corresponds to the size of the cam lobe and to the position of the cam segment, and the circuit achieves its longest dwell time when the lobes offset at the maximum angle, and it has a minimum dwell time when all the lobes align. It has timing measured in degree, which corresponds to the cam’s position on the shaft, with reference to the keyway/TDC, and the 803-PL2 switch, like all the Style F devices, has a cam duration range of 110 to 3490. It has a high-speed internal dwell time and timing settings which determines the machine’s operation, and it comes with a standard right shaft extension. The device comes in a NEMA Type 1 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 C (-22 to 200 degrees Fahrenheit). The 803-PL2 weighs approximately 5.9 kilograms (13 pounds) with less cam, and it has overall dimensions of 150.9 millimeters x 181 millimeters x 138.1 millimeters (5.9 inches x 7.13 inches x 5.44 inches).