803-B64W

The 803-B64W is a distinctive Bulletin 803 Rotating Cam Limit Switch manufactured by Allen Bradley. The switch is rated for a NEMA Type 4 & 13 enclosure, which is used to render protection against non-corrosive liquids, dust, water and falling dirt. The switch has a shipping weight of 53 pounds (24 kilograms). The 803-B64W has dimensions of around 13.44 x 14.5 inches; due to its larger size, it is normally used as a heavy-duty device. The switch comes with 2 to 12 independent cam operators. This rotating Cam Limit Switch also has six well-designed circuits.  To add on that, the 803-B64W also has the left shaft extension. It uses snap action 1 N.O – 1 N.C contacts. The contacts, which can also be categorized as single-pole double throw contacts, are rated for 10A constant current. The snap action contacts bear the NEMA rating designation of A600. Whenever snap-action contacts are used, the cam lobe usually activates the cam roller, thus compelling the contacts to snap over; the normally open contact closes and the normally closed contact opens.

The Rotating cam Limit Switch also has internal dwell and timing adjustments. Dwell time is the magnitude of time for which the cam lobe actuates the circuit. The keyway is the opening in the shaft that is used to link the driven shaft to the appliance. Dwell is influenced by the positioning of the segments of the cam and the vastness of the cam lobes. Alternatively, timing is influenced by the positioning of the cam on the shaft. The 803-B64W has an external adjustment sprocket. This sprocket has 48 teeth alongside a pitch diameter of 145.64 millimeters. It presents a method of altering the relative position between the driving machine and the shaft. When the device is stopped, withdraw the knotted knob to unbind the spline, allowing the camshaft to revolve in 5-degree increments.