The 803-A64 Rotating Cam Limit Switch by Allen-Bradley is a heavy-duty circuit control switch used for controlling industrial machines with repetitive operation cycles, and for industrial applications where the machine motion correlates with shaft rotation. The device is suitable for long life operations, and it is built for applications like packaging and assembling, punch presses, and steel forming processes. The device comes with 6 cam-actuated contact circuits with a spring-loaded cam roller and a rotating shaft with a 150 RPM maximum shaft speed. It also has 6 cam assemblies with adjustable lobes and valleys, and the circuit is activated as the lobes press against the cam-roller assembly. The 803-A64 switch has a 25A NC contact with AC and DC contact ratings, and it has a maximum MAKE/BREAK contact power rating of 1800 VA. The circuit is deactivated as the valley passes by the cam roller assembly, and the device has a dwell time (activation period) determined by the size of the cam lobe.

The 803-A64 rotating cam limit switch also has a timing measured in degrees which are determined by the position of the cam on the shaft, with reference to the key shafts top dead center (TDC). The 803-A64 has a minimum cam duration of 14 degrees and a maximum cam duration of 346 degrees, and like all Style A devices, it comes with a standard left-hand shaft extension. It has internal dwell and timing adjustments, and these settings are determined by the machine’s operation. The 803-A64 has a working temperature range of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), with a storage level of -30 to 93 degrees Celsius (-22 to 200 degrees Fahrenheit), and it comes with a NEMA Type 4, and 13 dust-tight and oil-tight enclosure. It weighs about 13.2 kilograms (29 pounds), with total dimensions of 211.1 x 144.5 x 200 millimeters (8.31 x 5.69 x 7.88 inches), and it is CE, CSA, and UL-certified.