The 803-A4RHRA module belongs to the 803 Rotating Cam Limit Switch family, manufactured by the Allen Bradley branch of Rockwell Automation. This module is applied where the motion of the object is related to the shaft rotation and is repetitive. When the shaft rotates, it actuates the contacts at different angles. They are normally used in packaging machinery, injection molding, and punch presses. The 803-A4RHRA has a 25 Amp NC double break contact with 2 to 12 independent cam operators. It has 4 circuits and has a modification of a single right-hand shaft extension. Additionally, it has a built in 40:1 reducer, to convert the rotations of the shaft by the ratio of 40 turns. The maximum shaft speed is 150 RPM. The 803-A4RHRA limiting switch module comes in a type 1 enclosure and measures 5.69 inches (144.5 millimeters) x 7.88 inches (200 millimeters) x 7.95 inches (201.77 millimeters) in dimension. It has a weight of 22 pounds (10.0 kilograms) and should be operated in a temperature range of -22 to 150 degrees Fahrenheit (-30 to 66 degrees Celsius). It is highly recommended that this module is stored in a temperature zone of -22 to 200 degrees Fahrenheit (-30 to 93 degrees Celsius).

The switches on this module have cams inside, which rotate in correspondence with the movement of the shaft. When the shaft rotates, it actuates the contacts, thus making the connection active or inactive. The 803-A4RHRA can be mounted in any plane, and the switches operate well in both the directions of the shaft rotation. It has internal timing and dwell adjustments; these adjustments are required if the device does not move. The 803-A4RHRA contacts have a maximum DC contact rating of 2.5 Amps at 115 to 125 Volts and 1.0 Amps at 230 to 250 Volts.