The Allen-Bradley 803-F412RY25-1 is a Rotating Cam Limit Switch (Bulletin 803). The high-quality Allen-Bradley rotating cam limit switch is engineered for rugged applications. It can be applied in construction and auto industry, and wherever there is a need to control robust machinery with a repetitive cycle of operation. This device is quality manufactured and requires very little maintenance during its use. The 803-F412RY25-1 is very flexible when it comes to installation. It can be positioned in any plane and operates equally well rotating in both directions. Long-life precision bearings are used for this device, which can work continuously over 20,000 hours. The 803-F412RY25-1 is “Style F” device, equipped with external dwell and timing adjustments. These parameters are adjusted independently for all of its 4 available control circuits. The setting of each cam operated circuit determines machine operation. The cam position on the shaft determines when the contact (10A, 1NO / 1NC, snap action) will be snapped during the 360 degree rotation (timing parameter).

The size of the lobe, created with cam segments joining, regulates how long the contact will be activated (dwell parameter). This device comes with nonstandard gear ratio. The gear ratio is 25 to 1. The enclosure type of this sensing device is NEMA 1 & 13. It also has a left-hand shaft extension. The Allen-Bradley 803-F412RY25-1 weighs approximately 12 pounds (5.4 kilograms) and its dimensions (shaft excluded) are 7.06 x 7.00 x 3.25 inches (179.4 x 177.8 x 82.6 millimeters). Its operating temperature range is -22 to 150 degrees Fahrenheit (-30 to 66 degrees Celsius). Allen-Bradley is no longer producing this part since it was discontinued in 2007.