The 803-A4RHRE is an Allen-Bradley Rotating Cam Limit Switch manufactured by Rockwell Automation. The device is one of six available styles of the Bulletin 803 rotating cam limit switches, designed for long life and to suit various control requirements. The 803-A4RHRE is an industrial circuit-controlling device used in machines with a repetitive cycle of operation. The switch determines the operation of a machine by setting timing (the position of the cam) and dwell (the duration of circuit activity). This heavy-duty device has four circuits and weighs approximately 22 pounds (10 kilograms). It has a right-hand extension and it can be mounted in any plane thanks to a contact dwell which can be set at almost any desired angle (from 11 to 360 degrees). This feature allows the switch to rotate on its bearings and perfectly operate in any direction.

The 803-A4RHRE belongs to the cam-opened contacts (Style “A”), which means that the cam mounted on the rotating shaft actuates the contacts as the shaft rotates. Each cam can be modified independently without having an effect on the other circuits. The 803-A4RHRE is typically used in industrial machines, such as punch presses, machines for assembly and packing, and so on. It has basic mechanical features which include 2 to 12 Style “A” circuits or snap action contact block assemblies, 2 to 12 cam assemblies, a rotating shaft, and a cam-roller spring-loaded assembly. The switch operates at temperatures ranging between -22 and 150 degrees Fahrenheit (-30 and 66 degrees Celsius), while its storing temperatures range between -22 and 200 degrees Fahrenheit (-30 and 93 degrees Celsius). These switches from this top-grade product line have long-lasting, high-quality bearings which ensure smooth rotation of the switch shaft assemblies. What makes this device even more interesting is the possibility to modify it for most applications to create a custom switch which suits the customer's needs perfectly. The switch is designed for rugged applications, which means that it is high-quality, and requires little to no maintenance if mounted properly.