Square D | MGL26400 | Circuit Breaker | 400A | 2-Pole | 18kA

Introducing the Square D MGL26400 circuit breaker—a robust, 400A, 2-pole device designed to protect heavy electrical systems with precision. Built for maintenance, retrofit, and replacement projects, this breaker delivers dependable performance when your existing Square D installation demands exact specs.

Key specifications

• Brand: Square D
• Part number: MGL26400
• Amperage: 400A
• Poles: 2-Pole
• Interrupt rating: 18kA

Why choose the MGL26400 for your Square D system

When you're upgrading or replacing a main or feeder breaker in a Square D installation, matching the part number MGL26400 guarantees alignment with the panel’s design and trip characteristics. The 400A rating supports substantial load centers, while the 2-pole configuration protects both hot legs, ensuring comprehensive protection for multi-wire circuits. The 18kA interrupt rating means it can safely clear high-energy faults, helping reduce damage to downstream equipment.

Ideal use cases

This breaker is ideal for:

• Maintenance outages where exact replacement is required
• Retrofit projects updating older Square D panels to current safety standards
• Replacement after a fault in a 400A, two-pole circuit

Compatibility and ordering notes

Notes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility with your Square D panel or distribution system. Because electrical systems vary, verify that your panel accepts MGL-series breakers and that 18kA interrupt capacity aligns with your fault current calculations.

Practical considerations and tips

• Keep spare MGL26400 on hand for planned maintenance or unexpected outages to minimize downtime.
• Before installation, ensure the panel’s bus design and wiring accommodate a 2-pole 400A breaker with 18kA interrupt capacity.
• Document the replacement using the exact part number (MGL26400) to simplify future maintenance or audits.

Choose the Square D MGL26400 circuit breaker when you need a precise, reliable 2-pole, 400-amp protection device for demanding applications. Its design aligns with Square D standards, delivering predictable performance and straightforward compatibility for maintenance, retrofit, or replacement projects.