Westinghouse PB1A Push Button Contact Block Assembly

The Westinghouse PB1A Push Button Contact Block Assembly is a panel-mount accessory designed to provide a defined start command within industrial control and operator interface systems, enabling safe, immediate initiation of equipment and processes in manufacturing, packaging, and automation environments. This unit features a grey operator color, a 30.5 mm mounting size, Model B configuration, and manual pushbutton actuation, functioning as an auxiliary contact block that can be paired with motor starters and industrial control stations to extend or retrofit existing control panels, MCCs, and distributed control architectures. It is rated for 50/60 Hz operation and industrial-duty use, making it suitable for HVAC equipment, power distribution networks, and motor control applications where reliable start signaling and robust operator interface performance are critical to maintaining uptime. The PB1A supports straightforward replacements and upgrades, aligns with common industrial standards, and has documented cross-references to popular equivalents such as Allen-Bradley 800T, Eaton 10250T, and Schneider Electric Harmony XB4 pushbutton assemblies, helping integrators select compatible hardware for legacy systems.