Westinghouse | LA3400WK | Circuit Breaker | 400A | 3-Pole | 600V

Introducing the Westinghouse LA3400WK Circuit Breaker — a robust 400A, 3-Pole, 600V protective device built to safeguard demanding electrical systems. Designed for maintenance, retrofit, and replacement projects, this breaker delivers dependable overload protection while preserving the integrity of your existing panels and wiring. When you need a reliable solution that matches specific specs, the LA3400WK is engineered to fit where 3-phase, high-capacity protection is required.

Why the Westinghouse LA3400WK stands out

• Exacting compatibility guidance: The part number LA3400WK is your best reference for compatibility. Always verify fit and ratings before ordering to ensure a seamless install in your panel lineup.
• High-current protection: With a 400A rating, this breaker protects large feeders and critical loads, reducing the risk of equipment damage from overloads while supporting scalable electrical needs.
• Three-pole, 600V capability: Perfect for three-phase systems that require balanced protection across all phases and compatibility with higher-voltage installations up to 600V.
• Versatile for maintenance and retrofits: A practical choice for upgrading, replacing, or refreshing protection in existing Westinghouse panels or other compatible systems that specify 3-Pole, 400A, 600V devices.
• Reliability you can trust: Westinghouse brings a long-standing lineage of electrical protection products, designed for consistent performance in real-world service environments.

This breaker is particularly well-suited for commercial or industrial electrical rooms that require robust main-disconnect or feeder protection without a full panel overhaul. It helps you maintain system uptime by offering a direct, spec-compatible replacement option when the goal is to preserve wiring, bus configurations, and panel form factors while upgrading protection credentials.

Ideal use cases

• Retrofit or replacement in existing panels with matching 3-Pole, 400A, 600V specifications
• Protection for high-load feeders in commercial facilities and light industrial environments
• Maintenance projects where maintaining current bus configurations is essential
• New installations that require a reliable, high-capacity three-phase breaker with clear compatibility reference

How to know it’s the right choice

• Confirm the panel and bus bar arrangement align with a 3-Pole, 400A, 600V device
• Use the LA3400WK part number as the primary compatibility reference when sourcing replacements
• Ensure the installation environment supports high-amperage, three-phase protection up to 600V

Practical tips for installation and care

• Have a licensed electrician perform the installation and adhere to local electrical codes and safety practices.
• Power down and lockout/tagout the system before any service work; verify absence of voltage at the panel.
• Double-check the panel’s rating and the breaker’s fitment to avoid compatibility issues during replacement.
• Store and handle the breaker in a clean, dry environment to prevent corrosion or contamination that could affect performance.

Specifications at a glance

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Part number: LA3400WK

When your project demands precise specs, reliable protection, and a straightforward path to replacement, the Westinghouse LA3400WK Circuit Breaker delivers. It’s a purpose-built solution designed to meet the needs of serious electrical installations while keeping compatibility clear and installation decisions unambiguous.