The Allen-Bradley 803-B4W device is a rotating cam limit switch in the Bulletin 803 Series. It is made to work with other, larger machines, and its smart technology lets it sense the motion of machinery that is rotating. The 803-B4W senses motion by initiating different functions at different points in the larger machine’s cycles and rotations, and it initiates the functions with its cams that are fixed to its own rotating shaft. The 803-B4W rotates with the machine.

The 803-B4W rotating cam limit switch is constructed for rugged and heavy-duty applications with many cycles. Its rugged switch, switch shaft, and other assemblies all run smoothly on equally rugged precision bearings. The 803-B4W’s switch can rotate clockwise or counterclockwise, and it can rotate in either of these directions on any mounting plane and when positioned at any angle. When used properly, this rotating cam limit switch will need very little maintenance. The 803-B4W switch is often used for heavy-duty punch pressing, assembly lines, packaging, and steel forming. Its timing and dwell time settings can be adjusted internally or externally. The switch’s other standard features include accommodation for either single or double shaft arrangements, contacts that are rated for “double break” or “snap action” in heavy-duty applications, Type 1 or Type 4/13 enclosure accommodation, and a maximum rotating shaft speed of 400 RPM. The 803-B4W is available in 6 standard styles, and manufacturers and users can also order their Allen-Bradley Bulletin 803-B4W rotating cam switches with custom features for special applications.