Westinghouse NSB PNO-1 Circuit Breaker Accessories

The Westinghouse NSB PNO-1 Circuit Breaker Accessories are auxiliary / pole adder components designed to expand circuit breaker interfaces in industrial motor control systems. They are commonly installed in motor starters, contactors, industrial switchgear, power distribution equipment, and HVAC systems, supporting auxiliary switching and breaker interface expansion in switchgear, MCCs, and distribution panels. Key specifications include a 600 VAC maximum voltage rating, 50/60 Hz compatibility, internal / accessory mounting, screw or mechanical terminal connections, and auxiliary switching contacts designed to integrate with Westinghouse circuit breakers and motor starters. This heavy-duty, industrial control component is used for replacement, retrofit projects, preventive maintenance, and electrical control upgrades, with common replacements including Allen-Bradley 140U Auxiliary Accessory, Eaton Auxiliary Pole Adder Kit, and Schneider Electric Power Pact Auxiliary Contact Kit.