Westinghouse LB3400W Circuit Breaker, 400A, 3-Pole, 600V

Meet the Westinghouse LB3400W circuit breaker — a purpose-built solution for the most demanding industrial electrical service, maintenance, and replacement projects. Designed for three-phase systems, this 400 A, 3-pole unit delivers reliable protection where it matters most.

Key specifications at a glance

• Manufacturer: Westinghouse
• Part Number: LB3400W
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V

Why this matters for your operation

In industrial facilities, protecting equipment and preventing downtime hinges on selecting a circuit breaker that matches your system’s requirements. The LB3400W is sized for three-phase layouts up to 600 V, offering dependable overcurrent protection for main feeds, branch circuits, and distribution panels. By aligning the part number LB3400W with your application, you ensure safe fit and straightforward maintenance over the long run.

How to verify compatibility

Confirm fit by checking the part number against your panel or equipment specification and your current electrical configuration. If you’re unsure about compatibility, we can help—send us a message and we’ll assist with part-number matching and application requirements.

Use cases and ideal applications

Best suited for facilities that rely on robust three-phase power distribution, including industrial manufacturing lines, warehouses, and service feeders. It’s a practical replacement for worn or obsolete units where a 3-pole, 600 V breaker is needed to restore reliable protection quickly.