Westinghouse | LA3400PRF | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Westinghouse LA3400PRF Circuit Breaker — a purpose-built solution for maintenance, retrofit, and replacement projects that demand precise specifications. With a robust 400A rating across 3 poles and a 600V operating capacity, this breaker is designed to protect demanding electrical systems in commercial and industrial environments.

Why this matters: When upgrading or refreshing panel protections, matching the exact part is critical to maintain safe, reliable operation. The LA3400PRF is engineered to fit into panels that require a three-pole, high-current breaker, delivering consistent performance under heavy load conditions without compromising safety or performance.

• Amperage: 400A — capable of interrupting and protecting high-demand circuits.
• Poles: 3-Pole configuration for balanced three-phase protection.
• Voltage: 600V rating, suitable for medium- to high-voltage panel applications.

This part number is the best reference for compatibility. Before ordering, confirm fit and ratings against your existing panel specifications. The LA3400PRF is ideal when you need a direct replacement or retrofit that aligns with current electrical draw, bus configuration, and trip characteristics, ensuring minimal downtime and consistent protection.

Practical use cases

- Retrofit an aging electrical panel to restore protection for large motors, compressors, or elevated-load processes.

- Replace a failed or discontinued breaker in systems that previously used the LA3400PRF, maintaining continuity with the panel’s design and wiring scheme.

- Upgrade to a higher-current, three-pole solution in facilities where three-phase distribution is standard, and reliable fault interruption is critical.

What sets it apart

Unlike generic substitutes, the Westinghouse LA3400PRF is purpose-built to align with specific panel configurations and protection schemes. Its 3-Pole, 400A, 600V design delivers dependable short-circuit interruption and overload protection, reducing the risk of equipment damage and unplanned outages. The emphasis on matching the exact part number helps installers avoid compatibility pitfalls that can occur with aftermarket options.

Installation and care tips

Work with a qualified electrician to verify panel compatibility, bus bar arrangement, and wiring clearance. Always disconnect power and follow lockout/tagout procedures before any replacement. Keep documentation of the part number (LA3400PRF) for future maintenance and ordering accuracy.