The 803-F612X Rotating Cam Limit Switch is a Style F circuit control device by Allen-Bradley used with machines with repetitive operation cycles, where the machine motion directly corresponds to the shaft movements. It is built for long-lived, heavy-duty operation like steel-forming, packaging, and punch press operation, and it makes use of a shaft-mounted cam for operation. The 803-F612X has 6 circuits with a 10A snap-action contact, and 6 independent cam operator assemblies with adjustable valleys and lobes, and it also has a contact-based spring-loaded cam roller. It has a rotating shaft with a 150 RPM maximum shaft speed, and with an over-sized ball bearing, and it also has a keyway (shaft slot) which attaches machines parts to the rotating shaft. The 803-F612X’s cam lobes actuate contact by brushing against the cam roller assembly, as the shaft rotates, and when the cam valley passes through the cam roller assembly, the circuit is deactivated.

The duration of the cam activation (dwell time) directly corresponds to the size of the cam lobes, and the dwell time is at a maximum when cam lobes offset, and it is at a minimum when they are aligned. The 803-F612X has a timing in degree (moment of activation), which is determined by the position of the rotating cam with reference to the keyway position, and the device, like all style F devices, has a timing range of 12 to 348 degrees. It has external timing and dwell time adjustments, which can be done with a screwdriver, while the machine is in motion, and the settings of both the dwell and the timing determine the machine's operation. The 803-F612X has a double shaft extension modification, and it comes in a NEMA 13, dust-tight, oil-tight, and watertight enclosure. It has a working temperature bracket of -30 to 66 degrees Celsius (-22 to 150 degrees Fahrenheit), with a storage bracket of -30 to 93 degrees Celsius (-22 to 200 degrees Fahrenheit), and it has CE, CSA and CE certifications. It weighs approximately 9.1 kilograms, and it is shipped in 466.1 x 388.1 x 194.5 millimeters dimensions.