The Allen-Bradley 803-A4RY4TO1 is a rotating cam limit switch in the Bulletin 803 series. It is a Style A rotating cam limit switch, which means that it has a standard left shaft extension with a shaft speed of up to 150 RPM, a normally closed (NC) double break contact that is rated at 25 A, and between 2 and 12 cam operators that can work independently. It can come in Type 1, 4, or 13 enclosure. The Allen-Bradley 803-A4RY4TO1’s minimum cam duration is 14 degrees and the maximum cam duration is 346 degrees. The cam duration is also called the dwell time because the length of the dwell time is determined by the size of the cam duration angle, which in turn is determined by the position the 803-A4RY4TO1’s 2 cam segments. The more aligned they are, the closer they are in conjunction, and the more opposed they are, the further they are from each other, and the bigger the angle, the longer it takes for the shaft to rotate all the way through it.

The 803-A4RY4TO1 rotating cam limit switch is engineered for working with a larger machine that operates in a constant series of repetitive cycles. The 803-A4RY4TO1 coordinates itself with the larger machine’s motion and uses its technology to activate different functions at different stages in the larger machine’s cycle. This makes the 803-A4RY4TO1 rotating cam limit switch a good controller for assembly line machines, packing and packaging machines, injection molding machines, and for waterway locks or gates.