Westinghouse | LB3400NW | Circuit Breaker | 400A | 3-Pole | 600V | Bolt-On

Introducing the Westinghouse LB3400NW, a purpose-built bolt-on circuit breaker designed for serious three‑phase protection. With a 400A rating, 3-pole configuration, and a 600V capacity, this breaker is built to handle demanding commercial and light industrial load centers where reliable interruption is essential.

• Amperage: 400 A
• Poles: 3-Pole (three‑phase)
• Voltage: 600 V
• Mounting: Bolt-On
• Part reference: LB3400NW

Use cases and applications

• Maintenance replacements in bolt-on panelboards that require a direct-fit, high‑current 3‑pole breaker.
• Retrofit projects where upgrading or restoring three‑phase protection for feeders, motors, or distribution concerns is needed.
• Spare part for legacy Westinghouse systems or compatible panels that specify bolt‑on breakers of this size and rating.

What makes this unit stand out

• Direct fit for compatible bolt-on panels: The LB3400NW is designed for panel designs that accept bolt‑on breakers, providing a secure, vibration‑resistant connection essential in industrial environments.
• High-current, three‑phase protection: 400 A through 3 poles delivers robust protection for multi‑motor loads, feeders, and balanced three‑phase circuits.
• Clear reference for compatibility: The LB3400NW part number is your best guide when verifying suitability for existing equipment or replacement schedules.

Important considerations for purchasing and installation

• Always confirm fit and ratings against your panel’s documentation before ordering. The LB3400NW is specified for bolt-on installations and requires panels designed to accept this form factor.
• Engage a qualified electrician for installation. Bolt-on breakers require proper torque on mounting hardware and secure terminal connections to ensure safe operation.
• Plan for maintenance checks after installation, including inspecting mounting integrity and verifying uninterrupted three‑phase protection across all poles.

Who benefits most from the Westinghouse LB3400NW

• Facilities managers updating older electrical infrastructure needing reliable 400 A, three‑pole protection.
• Electrical contractors performing panel retrofits or replacements in commercial settings.
• Industrial operators seeking durable, high‑capacity protection for critical three‑phase circuits.

In short, the Westinghouse LB3400NW provides a dependable bolt-on solution for 400A, 3‑pole, 600V protection in compatible panels. With clear compatibility guidance and a focus on secure mounting and reliable performance, it’s a practical, straightforward option for retrofit, maintenance, and replacement projects.