Eaton | LDB3400 | Circuit Breaker | 400A | 3-Pole | 600V

Eaton LDB3400 is a demanding‑use circuit breaker built for 600V three‑phase systems. This 400A, 3‑pole unit delivers reliable overload and short‑circuit protection in commercial and industrial electrical distributions, making it an ideal choice for maintenance, retrofit, and replacement projects where exact specs matter.

Key specifications at a glance:

• Amperage: 400A
• Poles: 3‑Pole (three‑phase)
• Voltage: 600V
• Reference for compatibility: Part number LDB3400 is the strongest identifier to ensure a proper fit
• Important note: Verify fit and ratings before ordering to avoid mismatches

Why choose this Eaton breaker for your project?

• Designed for replacement and retrofit where your existing panel was configured for the LDB3400 family, ensuring a clean, reliable upgrade path.
• Streamlines maintenance by providing a known, compatible component that aligns with your 3‑phase, 600V distribution setup.
• Reduces downtime with a straightforward swap for compatible panels, keeping your equipment protected without guessing about compatibility.

Use cases and ideal applications

• Replacement for worn or failed 400A, 3‑pole breakers in 600V distribution panels.
• Retrofit projects when upgrading or refreshing a feeder or MCC (motor control center) section that requires LDB3400 compatibility.
• Part of a spare parts inventory for service teams that manage Eaton‑equipped facilities.

Installation and safety reminders

• Ensure power is safely isolated and that the panel is designed to accept the LDB3400 family before installation.
• Consult manufacturer documentation for torque specs and installation guidelines, and replace any necessary auxiliary components as specified by Eaton.