Square D | MHL3640025DC | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Square D MHL3640025DC circuit breaker—a robust 400A, 3-pole, 600V unit designed for demanding electrical systems. This part is the reliable choice for maintenance, retrofit, and replacement projects where precise specs and dependable protection matter.

Key specifications:

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Part number: MHL3640025DC

Why this matters for your panel:

• Three-pole design supports three-phase power distribution for balanced protection across all legs of a 3-phase system.
• 600V rating makes it suitable for industrial and commercial environments, aligning with typical 3-phase feeders and motor circuits.
• As a maintenance or retrofit replacement, this specific part number ensures compatibility with existing Square D installations and preserves switchgear integrity.

Ideal use cases:

• Replacing a failed main or feeder breaker in a 3-phase 600V system.
• Retrofitting legacy panels that require a 400A, 3-pole, 600V Square D breaker with the exact part number.
• Upgrading service capacity or protecting industrial equipment racks, data centers, or manufacturing lines with a 400A feeder requirement.

Important compatibility note:

Before ordering, confirm fit and ratings for your specific panel. The part number MHL3640025DC is the most reliable reference for compatibility and ensures you get the exact trip characteristics and physical footprint needed for your enclosure.

Installation and safety tips (for qualified technicians):

• Power down the system and follow lockout/tagout procedures before working on any circuit breaker.
• Verify the panel's model, catalog number, and the intended circuit's current and voltage requirements match the breaker you’re purchasing.
• Adhere to the manufacturer's installation torque specs and guidelines for secure mounting and proper electrical contact.

Choose Square D for dependable protection in 600V, three-phase environments. The MHL3640025DC delivers consistent performance and peace of mind for critical 400A feeders.