The 803-A6 is a Style “A” Rotating Cam Limit Switch by Allen-Bradley that is used with heavy-duty machinery that has repeating operational cycles for applications where the shaft rotation correlates with the machinery motion. It is built for heavy-duty industrial operation with a long product life and it is suitable for applications like steel forming, packaging/assembling, and injection molding. The 803-A6 has 6 cam-opened circuits with 25A-rated Normally-Closed (NC) double block contact, and a spring-loaded cam roller mounted on a contact base. It also has a rotating shaft with a 150 RPM base shaft speed, and 5 independently-operated cam assemblies with heavy-duty adjustable valleys and lobes. The device has a keyway slot for connecting the shaft to the machine, and it has a standard left-shaft extension. When the shaft rotates, the circuit is activated as the cam lobes brush through the cam roller, opening contacts 1 and 2 of the NC contact, and the circuit is de-activated when the cam valley passes through the switch’s cam roller.

The 803-A6 has a dwell time corresponding to the period of circuit activation, and it is determined by the length of the cam lobe, and the device has a timing setting corresponding to the moment when the rotating cam activates the circuit, and it is also determined by the position of the cam with reference to the keyway. The 803-A6 has a cam duration range of 14 to 346, and it has an internal dwell and timing adjustment, which determines machines operation. It has an operating temperature range of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), with a non-operating limit of -30 to 93 degrees Celsius (-22 to 200 degrees Fahrenheit), and it comes with an indoor, rated NEMA 1 enclosure. The 803-A6 is covered with rugged cast iron side plate, fitted for harsh industrial conditions, and it has a net weight 14.1 kilograms (31 pounds), with total dimensions of 211.1 x 144.5 x 200 millimeters (8.31 x 5.69 x 7.88 inches).