Westinghouse | MA3400S | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Westinghouse MA3400S circuit breaker — a precise, dependable solution for protection in demanding electrical systems. With a 400A rating, 3-pole configuration, and a 600V operating range, this unit is built to keep critical circuits safeguarded in industrial and commercial environments where reliability isn’t optional.

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Ideal for: Maintenance, retrofit, and replacement where MA3400S compatibility is required
• Compatibility reference: Part number MA3400S is the best reference for ensuring a proper fit

Why the MA3400S stands out for your project

• Designed for scenarios where a precise 3-pole, 400A, 600V protection device is specified — making it a straightforward, no-surprise replacement in compatible panels and systems.
• Retrofit-ready performance means you can upgrade aging protection without overhauling your distribution layout or panel family.
• Reliable, predictable protection for feeders and downstream circuits in facilities like warehouses, manufacturing floors, and commercial electrical rooms.

Compatibility and installation notes you can rely on

• Fit check: Confirm fit and ratings before ordering. The MA3400S part number is the most reliable compatibility reference for your panel or bus configuration.
• Standards: Follow applicable electrical codes and the panel manufacturer’s installation guidelines. Use proper lockout/tagout procedures during service.
• Spare management: Keep spares in a clean, dry location to preserve performance and longevity.

Practical use cases that illustrate value

• Upgrading protection in existing facilities where a 400A, 3-pole, 600V breaker is specified, allowing seamless continuity of protection without panel changes.
• Replacing failed or worn breakers in service panels that require the MA3400S for continued compatibility and safety.
• Maintaining robust electrical protection in retrofit projects where minimizing downtime and ensuring correct part reference are priorities.

What to expect in terms of performance and reliability

Westinghouse delivers consistency in trip behavior and protection across typical operating conditions, helping facilities avoid unexpected outages. The MA3400S is built to integrate smoothly into existing systems that rely on this exact part number for continued, dependable protection.