Allen-Bradley 800H-WK42A Push Button Unit With Pilot Light

The Allen-Bradley 800H-WK42A gray, 30 mm momentary push-button unit with a flip-lever operator provides START control in a 1-NO/1-NC configuration and is intended for panel-mounted industrial control. As part of Rockwell Automation’s 800H family, this 30 mm push-button delivers a momentary action suitable for starting machines or processes in control panels, with a START legend and a gray actuating button for quick visual identification. The unit supports one normally-open and one normally-closed standard contact pair, enabling simple start/stop logic in typical automation circuits and allowing wiring that conforms to common control schemes. The flip-lever operator is designed to be operated with a light, positive feel, and the compact 30 mm form factor is aligned with standard 800H mounting choices used across OEM and maintenance environments. This push-button unit is commonly used in installations where a dedicated START input is required on a 30 mm operator platform, and its combination of momentary action, gray color, and START labeling helps operators quickly locate the correct control in busy panels.