The 803-B10RH Rotating Cam Limit Switch by Allen-Bradley is a circuit control device used with heavy-duty industrial machinery that has repetitive operation cycles, and for heavy-duty/long-life industrial applications where the machine motion equals the shaft rotation. The devices utilize its shaft-mounted cam operation for circuit actuation and it is built for rugged and intense industrial applications like steel forming and Watergate/lock operations. The 803-B10RH comes with 10 circuits and cam snapped-action contact blocks (1 NC, 1 NO), and 10 independent cam operators, with adjustable segments that can be set individually, and the snap-action contact is actuated when the upper cam segment (lobe) presses against a contact base mounted spring-loaded cam roller, and it is deactivated when the lower cam segment (valley) passes under the cam roller. The device also comes with a rotating shaft with a 150 RPM base shaft speed, and a keyway which connects machines to the shaft. The 803-B10RH has a dwell time (or activation time) determined by the size of the lobe, and the cam achieves its maximum dwell time when its lobes are angularly offset at the maximum possible angles, and it is at the minimum when the lobes perfectly align.

The 803-B10RH has a timing feature which is the activation period from the time of cam rotation, and it is determined by the position of the cam with reference to the top dead center (TDC) of the keyway, and like all Style B switches, the 803-B10RH has cam duration limits of 14 to 346 degrees. It has internal timing and dwell time adjustments, which determine the machine’s operations, and it comes with a factory-customized left-hand shaft extension. The 803-B10RH has an operating temperature range of -22 to 150 degrees Fahrenheit, in a NEMA Type 4 and 13 dirt, oil, and dust-tight enclosure, and it is stored at a temperature range of -22 to 200 degrees Fahrenheit. The 803-B10RH has total shipping dimension of 411.2 x 144.5 x 200 millimeters (16.19 x 5.69 x 7.88 inches), with an approximate weight of 19.1 kilograms (42 pounds), and it has CE, UL, and CSA certification.