Westinghouse | NB31200S | Circuit Breaker | 1200A | 3-Pole | 600V | Bolt-On

Meet the Westinghouse NB31200S 1200A Circuit Breaker — a rugged, three-pole bolt-on solution built for demanding electrical distributions. Designed for maintenance, retrofit, and replacement projects where exact specifications matter, it provides reliable protection for high-load, 3-phase systems at up to 600V.

• Amperage: 1200A
• Poles: 3-Pole
• Voltage: 600V
• Mounting: Bolt-On
• Part Number: NB31200S

The NB31200S is purpose-built for scenarios where a heavy-duty, 3-phase circuit breaker is required to protect large feeders and main distribution paths. Its bolt-on design simplifies installation into compatible panels, making it a practical choice for field retrofits, service upgrades, or replacing a failed unit without overhauling the panel architecture.

Why this model stands out

In environments where electrical demand is high, a 1200A, 3-pole breaker like the NB31200S can prevent nuisance trips and reduce downtime by providing robust, dependable protection for essential circuits. The 600V rating ensures compatibility with typical industrial and commercial distribution systems, while the bolt-on method offers straightforward mounting and secure electrical connection for steady performance over time.

Ideal use cases

• Maintenance and retrofits in industrial panels that require a high-capacity, 3-pole 600V breaker
• Replacement for failed or obsolete NB31200-series units in service entrances and large distribution panels
• Upgrades to support higher load requirements in facilities with expanding equipment and processes

Key considerations for a seamless fit

Before ordering, confirm fit and ratings to ensure compatibility with your panel. The NB31200S part number is the most reliable reference for matching hardware, mounting footprint, and electrical characteristics. Use this model when you need a dependable, bolt-on solution that aligns with Westinghouse’s design standards and your 3-phase, 600V distribution needs.

Practical insights for installers

• Verify the panel’s allowable amperage and bolt-on mounting compatibility with the NB31200S
• Follow proper lockout/tagout procedures and consult panel diagrams to identify correct bus connections
• Handle with care to avoid damage to terminals and mounting surfaces during installation
• Keep a correctly rated spare NB31200S on hand for faster replacements and reduced downtime