The 803-A9RH Rotating Cam Limit Switch by Allen-Bradley is a control circuit device used with heavy-duty machinery with a dedicated cycle process in applications where the machine’s motion correlates with the shaft motion. The device is built for long-life and heavy-duty industrial processes like packaging and assembly, injection molding, and punch pressing, and like every member in the Allen-Bradley 803 series, it makes use of cams mounted on a shaft. It is a Style A device with 9 cam-opened circuits, and 9 cam assemblies with user-adjustable segments. It also comes with a rotating shaft with a 150 RPM base shaft speed, a spring-loaded cam-roller, and a right-hand customized shaft extension. The device is activated when the lobe brushes against the cam-roller, and it is de-activated as the valley passes through the cam-roller, and the entire activation period or dwell time is determined by the length of the lobe and the position of the cam.

The 803-A9RH has a timed activation, set in degree angle (timing), and the 803-A9RH, like every Style A series member, has a cam duration range of 14-3460. It has an N.C contact with 150/15A and 30/3A MAKE/BREAK AC voltage ratings at 120 Volts and 600 Volts AC, and it also has an 1800 Volts A MAKE/BREAK power rating, with a 1A DC rating at 230-250 Volts DC. The 803-A9RH also has internal Timing and Dwell Time Adjustments, and it comes with a NEMA type 1 rated enclosure. It has a factory-tested operational temperature range between -30 degrees Celsius and 66 degrees Celsius (-22 degrees Fahrenheit and 150 degrees Fahrenheit), and a tested storage temperature range of -30-93 C (-22-200 degrees Fahrenheit). It weighs about 15.9 kilograms (35 pounds), with a total volume of 311.2 millimeters x 181 millimeters x 138.1 millimeters (12.25 inches x 5.69 inches x 7.88 inches), and it has CE, UL, and CSA certifications.