The 803-B104X Rotating Cam limit Switch with Double Shaft Extension Option is a control circuit device in the Allen-Bradley Bulletin 803 Style “B” series, which is used with heavy-duty machinery with dedicated operation cycles in applications where motion directly corresponds with shaft rotation. It is built for heavy-duty operation with long operation life, and it is suitable for processes like packaging/assembling, steel forming, and injection molding. It has 10 independently-operated cam assemblies with adjustable lower and upper cam segments, and it also has 10 circuits with a 10A snap action contact, with both AC and DC contact ratings. The 803-B104X has a rotating shaft with a double shaft extension and a shaft base speed of 150 RPM, and it also has a contact-mounted cam roller, which produces activation as the upper cam segment glides through it.

The shaft has an internal slot (keyway) which connects the shaft to machines, and when the shaft rotates, the cam lobes press against the cam roller, opening contacts 1 and 2, and closing contacts 3 and 4. The 803-B104X has a dwell time (activation duration) which is determined by the length of the higher cam segment, and it can achieve the maximum dwell time when all the lobes are offset at the maximum angle, and it has its minimum dwell time when lobes align perfectly. The 803-B104X has a timing measured in degree, which is determined by the position of the rotating cam with reference to the Top Dead Center, and like all Style “B” devices, it has a cam duration range of 14 to 346 degrees. It has a double-shaft extension modification, and it is enclosed in a NEMA Type 4, and 13, watertight, and has a dust-tight industrial enclosure. The 803-B104X has a functional temperature range of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), with storage temperature limits of -30 to 93 degrees Celsius (-22 to 200 degrees Fahrenheit), and with its cast iron side plate, it is designed for rugged industrial applications. It has a net weight of 19.1Kg, with dimensions of 411.2 x 144.5 x 200 millimeters, and it is UL, CE, and CSA certified.