Westinghouse PB1B Push Button Contact Block Assembly

The Westinghouse PB1B Push Button Contact Block Assembly is an auxiliary contact block designed for operator interface and control switching in industrial environments. It is intended for use with pushbuttons and control stations and is commonly installed in pushbutton stations, motor control centers, manufacturing equipment, and industrial automation panels. The Model B, operator-mounted block features normally closed (NC) auxiliary contacts with screw terminal connections for reliable field wiring and is rated for 50/60 Hz industrial service with compatibility to industrial control circuits. This PB1B unit provides control signal switching and contact expansion, and supports replacement, retrofit projects, preventive maintenance, and control station upgrades in facilities such as manufacturing plants, HVAC equipment, power distribution systems, and motor control applications where dependable operator control is required. Common replacements include Allen-Bradley 800T-XB, Eaton 10250T, and Schneider Electric Harmony ZBE102.