Westinghouse | NBY31200S | Circuit Breaker | 1200A | 3-Pole | 240V | Bolt-On

Westinghouse NBY31200S is a rugged bolt-on circuit breaker engineered for high-demand 240V applications. With a 1200A rating and a 3-pole design, this unit delivers reliable overcurrent protection for large feeders and motor loads, while simplifying maintenance, retrofit, and replacement in compatible panels. When you need a trustworthy, drop-in solution, this breaker is built to perform and endure in demanding environments.

Key specifications

Amperage: 1200A • Poles: 3-Pole • Voltage: 240V • Mounting: Bolt-On • Part number: NBY31200S • Brand: Westinghouse

Why this breaker stands out

Designed for maintenance, retrofit, and replacement in compatible panels, the NBY31200S leverages a bolt-on mounting that enables quicker, more secure installation compared with plug-in equivalents. Its high-current capability is ideal for protecting feeders and large electrical equipment, reducing the risk of damaging faults and minimizing downtime during servicing. The part number is the most reliable reference for compatibility, ensuring you’re pairing the right breaker with the right panel hardware.

Ideal use cases

Best suited for industrial or commercial panels that require a 1200A, 3-pole, 240V bolt-on breaker. Typical scenarios include feeding large HVAC systems, protecting heavy machinery and conveyor lines in manufacturing, and securing power distribution feeders in data centers or large facilities where consistent, robust protection is essential.

Installation and compatibility tips

To ensure a proper fit, rely on the part number NBY31200S as your compatibility guide. Confirm that your panel supports bolt-on breakers of this configuration and that the 240V, 1200A ratings align with your load requirements. Adhere to the panel manufacturer's torque specifications and standard wiring practices to maintain safe, reliable connections. If you’re replacing an existing breaker, ensure the mounting geometry and electrical characteristics match your panel’s design.

This Westinghouse breaker is a purpose-built solution for high-current protection in compatible panels, offering straightforward installation, dependable performance, and peace of mind for critical electrical systems.