The 803-PL12X 803 Rating Cam Limit Switch from Allen-Bradley is a circuit controller for heavy-duty machinery that has repetitive operation cycles. It is used in industrial applications where the machine motion corresponds to the shaft rotation. It is designed for long-life, heavy-duty applications, and it has a factory-modified double shaft extension with a high-speed and low-cost internal cam adjustment, and with a cam code designator sequence from the first cam on the device. The device has an integral 25A N.C contact with 150A/15A and 30A/3A MAKE/BREAK ratings at 120 Volts and 600 Volts AC, respectively, and it has 1A DC MAKE/BREAK ratings at 230 to 250 Volts DC, respectively. The 803-PL12X has 12 sequenced cam-opened contacts, with a spring-loaded cam-roller, a rotating shaft with 400 RPM as the maximum shaft speed, and 2 cam assemblies that have adjustable segments.

The 803-PL12X has sequential circuit activation and de-activation, and the circuit activates when the cam lobe brushes against the cam roller assembly, and it de-activates as the valley passes by the cam-roller assembly. The device also has a sequenced timing which is determined by the position of the cam segment on the shaft relative to the keyway position, and the total dwell time is determined by the size of the lobe. The 803-PL12X has a double shaft extension, and it has an internal dwell time and timing adjustment. It has a working temperature between -30 degrees Celsius and 66 degrees Celsius (-22 degrees Fahrenheit and 150 degrees Fahrenheit), and its storage temperature is between -30 and 93 degrees Celsius (-22 and 200 degrees Fahrenheit), and it has a NEMA type 4 and 13 rated enclosure. It weighs about 13.6 kilograms (30 pounds), with an overall volume of 483.3 millimeters x 181 millimeters x 138.1 millimeters, and the 803-PL12X is CSA, UL, and CE-certified.