Eaton LZMN3-A400-I Circuit Breaker 3-Pole 400A 50kA

The Eaton LZMN3-A400-I is a high-performance 3-pole molded case circuit breaker engineered for reliable electrical distribution and comprehensive equipment protection. Designed to handle a rated current of 400A with a robust breaking capacity of 50kA, this device provides essential safety and operational stability for demanding industrial and commercial power systems. Its construction ensures consistent performance and durability in environments where electrical reliability is critical.

Advantages

This circuit breaker offers exceptional reliability through its advanced design, which effectively manages high current loads while maintaining system integrity. The 3-pole configuration allows for efficient integration into three-phase power distribution networks, providing a secure solution for protecting sensitive electrical equipment from overloads and short circuits. Its high breaking capacity ensures that the device can safely interrupt significant fault currents, thereby minimizing the risk of damage to downstream components and enhancing overall facility safety.

Suitable for

• Industrial power distribution systems
• Commercial building electrical infrastructure
• Protection of heavy-duty machinery and motors
• Main distribution boards and sub-distribution panels

When it may not be suitable

This circuit breaker is not intended for use in low-current residential applications where a 400A rating would be excessive and impractical. It is also not suitable for environments requiring specific environmental protections, such as high-moisture or explosive atmospheres, unless housed within an appropriately rated enclosure.

Key specifications

• Rated current: 400A
• Number of poles: 3
• Breaking capacity: 50kA
• Device type: Molded case circuit breaker

How to use

The Eaton LZMN3-A400-I should be installed by a qualified electrician in accordance with local electrical codes and safety regulations. The device is typically mounted within a distribution panel or switchgear enclosure. Ensure that all cable connections are tightened to the manufacturer's specified torque settings to prevent overheating. Once installed, the breaker can be operated manually via the front-mounted toggle mechanism to connect or disconnect the power supply.

What to consider before purchase

• Verify that the 400A rating matches your system's load requirements.
• Ensure the 50kA breaking capacity is sufficient for the prospective fault current levels at the installation point.
• Confirm that the physical dimensions of the breaker are compatible with your existing switchgear or panel space.
• Check that the installation environment meets the necessary temperature and humidity standards for industrial equipment.

Usage recommendations

Regular inspection of the terminal connections and the operational status of the breaker is recommended to ensure long-term performance. Always consult the technical documentation provided by Eaton for specific installation guidelines and maintenance intervals.