Allen-Bradley 800H-JR4B Selector Switch Assembly

Allen-Bradley 800H-JR4B is a 30 mm selector switch assembly for panel mounting, offering a three-position operation and a white knob for easy identification of the active state. Within the 800H family, JR4B variants support several contact configurations, including 1 NO 1 NC and 2 NO 2 NC, and they can be paired with a KB7 cam for standard detented action. This unit is commonly used on control panels to implement state selections such as Hand–Off–Auto or Start/Stop logic in industrial equipment, and several catalogs list it as discontinued within the legacy 800H lineup. As a 30 mm operator, it is compatible with standard 30 mm compact control switch assemblies in Rockwell Automation's catalog ecosystem.