Westinghouse Electric Corporation PB1AA Pushbutton

The Westinghouse PB1AA Pushbutton is a panel‑mount, momentary operator designed as a manual control signal input in industrial control and operator interface systems. It is routinely installed in control panels, motor control centers, manufacturing equipment, and industrial automation machinery to support Start/Stop and control-station actions in manufacturing facilities, HVAC equipment, power distribution networks, and motor control applications that require reliable operator interface functionality. The pushbutton accepts PB1A or PB1B contact blocks, with the final contact configuration determined by the installed block, and uses screw-terminal connections for wiring. It is rated for 50/60 Hz operation and is an industrial-duty device with corrosion‑resistant construction for demanding environments. Common replacements include Allen-Bradley 800T Pushbutton Assembly, Eaton 10250T Pushbutton Operator, and Schneider Electric Harmony XB4 Pushbutton, reflecting its role in retrofit, maintenance, and control-station upgrades.