Eaton | MDLB3400 | Circuit Breaker | 400A | 3-Pole | 600V

Eaton MDLB3400 Circuit Breaker — 400A, 3-Pole, 600V — a rugged protective device designed for maintenance, retrofit, and replacement projects where exact specifications matter. This model is built to slot into existing Eaton systems where the MDLB3400 is the referenced part number, ensuring reliability and consistent protection across your electrical distribution.

Key specifications

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

In three-phase installations, a 3-pole breaker like the MDLB3400 provides balanced protection across all conductors, helping prevent uneven fault currents and safeguarding motors, drives, and other three-phase equipment. With a 600V rating, it covers a broad range of commercial and industrial distribution needs while delivering dependable interruption performance when faults occur.

Why choose this model

• Direct compatibility for maintenance, retrofit, or replacement where the Eaton MDLB3400 is specified.
• High-current protection (400A) suitable for feeders and large circuits in industrial settings.
• Three-pole design ensures synchronized protection across all phases, enhancing system safety and reliability.

Compatibility and ordering guidance

Notes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility, so verify that MDLB3400 matches your panel, bus configuration, and voltage class before purchase.

Ideal use cases

• Maintenance and refurbishment of existing Eaton-based electrical distribution systems.
• Retrofits or upgrades where your installation requires a 400A, 3-pole, 600V protection device.
• Replacement of worn or failed protection devices in industrial panels, commercial distribution equipment, or service entrances that rely on Eaton components.

Practical considerations and tips

To ensure a smooth installation, align the breaker’s ratings with your equipment’s design specifications and refer to the system labeling for permitted amperage, voltage, and pole configuration. Keep the MDLB3400 as part of your standard replacement parts inventory to minimize downtime and maintain consistent protection across your facility.