Westinghouse | NB3400P | Circuit Breaker | 400A | 3-Pole | 600V

Introducing the Westinghouse NB3400P Circuit Breaker — a purpose-built protection device engineered for reliability in demanding 3‑phase environments. This 400A, 3‑pole breaker is rated for 600V, making it a precise match for industrial and commercial applications where robust, consistent electrical protection is essential.

Designed for maintenance, retrofit, and replacement projects, the NB3400P model ensures your existing panels stay safe and compliant without compromising performance. When exact specifications matter, this 400A, 3‑Pole, 600V breaker is engineered to align with Westinghouse panel architectures, delivering dependable overload and short‑circuit protection in active systems.

Key specifications at a glance

• Amperage: 400A
• Poles: 3‑Pole
• Voltage: 600V

Why choose the Westinghouse NB3400P for your project?

• Exact compatibility guidance: The NB3400P part number is the most reliable reference for matching your panel and system requirements.
• Streamlined maintenance and replacements: When a component wears or fails, the NB3400P offers a straightforward path to restore protected circuits to full operation.
• Reliable 3‑phase protection: With three poles, it provides coordinated shutoff across all phases, helping prevent imbalances and equipment damage in 3‑phase systems.
• Clear, compatible integration: Built to align with Westinghouse panel designs, reducing doubt during retrofits and ensuring clean integration with existing buses and accessories.

Who benefits most

• Facilities with 3‑phase power looking to upgrade or replace aging protective devices
• Electrical contractors performing panel retrofits or service upgrades
• Industrial and commercial environments where a 400A capacity is required for main or feeder protection

Practical considerations for installation and safety

• Before ordering, verify fit and ratings against your existing panels and bus arrangement to ensure proper installation.
• Confirm that your system’s voltage and protection requirements align with a 600V, 400A, 3‑pole configuration.
• Engage a licensed electrician to handle installation, follow manufacturer guidelines, and observe all relevant electrical codes and safety practices.

The Westinghouse NB3400P circuit breaker delivers targeted, dependable protection where it matters most—keeping complex, multi‑layer electrical systems safe, compliant, and running smoothly. If you’re upgrading, replacing, or maintaining a 3‑phase 600V setup, this NB3400P model is a precise, trustworthy choice that aligns with your existing infrastructure and long‑term performance goals.