Square D | LHF36400V | Circuit Breaker | 400A | 3-Pole | 36400V

Square D LHF36400V circuit breaker delivers robust protection for high-demand, three-phase electrical systems. With a 400 A rating, a 3-pole configuration, and a voltage rating of 36,400 V (36400V), this unit is engineered to safeguard large distribution networks, switchgear, and panelboards in industrial environments.

This device is purpose-built for maintenance, retrofit, and replacement projects where exact specifications matter. The LHF36400V part number serves as the most reliable reference for compatibility, ensuring you match the exact form factor, mounting, and interrupting characteristics your system requires. When you’re updating aging protection or reconfiguring a high-voltage, three-phase circuit, this breaker helps you maintain system integrity without redesigning your panel.

Key specifications at a glance

• Amperage: 400 A
• Poles: 3-Pole
• Voltage: 36,400 V (36400V)
• Part number: LHF36400V — best reference for compatibility
• Applications: maintenance, retrofit, and replacement in appropriate high-voltage, three-phase systems

Why this breaker stands out

• Precise compatibility relies on the exact part number. LHF36400V is your most reliable key to matching form factor, trip characteristics, and mounting style in Square D installations.
• High-capacity protection supports demanding industrial networks, helping protect personnel and equipment by interrupting fault currents efficiently in 3-phase systems.
• Versatile for upgrades from aging protection schemes or legacy panels that require a like-for-like replacement with minimal panel modifications.

Ideal use scenarios

• Upgrading or replacing high-current protection in large distribution panels, switchgear, or motor control centers
• Retrofit projects where the existing protection device must match a legacy LHF family footprint and electrical characteristics
• Maintenance and downtime planning that prioritizes exact specifications to avoid compatibility surprises

Practical considerations for installation and compatibility

• Always verify fit and ratings before ordering. The LHF36400V reference ensures you’re selecting the correct breaker for your panel or switchgear.
• Consult your system’s documentation and, if needed, coordinate with a qualified electrician to confirm panel compatibility and three-phase bus interfaces.
• Keep in mind this unit is designed for high-voltage, three-phase service. Follow appropriate safety protocols and lockout/tagout procedures during replacement or maintenance.

For reliable, spec-accurate protection in demanding industrial applications, the Square D LHF36400V circuit breaker provides the clear, compatible choice for 400 A, 3-pole protection at 36,400 V. Use the part number as the definitive reference to ensure a proper fit and uninterrupted operation in your high-voltage distribution environment.