Square D | LHF26400 | Circuit Breaker | 400A | 3-Pole

Meet the Square D LHF26400 400A 3-Pole Circuit Breaker — a purpose-built protector designed for maintenance, retrofit, and replacement projects where exact specifications matter. This unit delivers reliable overcurrent protection for Square D installations, ensuring your system stays safeguarded under demanding loads.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole
• Part number (compatibility reference): LHF26400

Compatibility tip: Confirm fit and ratings before ordering. The part number is the best reference for compatibility with your Square D panel.

Why this breaker stands out

Designed to slot into compatible Square D systems, the LHF26400 helps reduce downtime during maintenance and retrofit by offering a precise match for 400A, 3-pole protection. Its 3-pole configuration is ideal for three-phase circuits, delivering dependable protection across each leg and simplifying panel wiring during replacements or upgrades. By sticking with the exact part reference, you avoid mismatches that can lead to compatibility issues or unreliable performance.

Ideal use cases

• Maintenance of existing Square D installations where exact specifications are required
• Retrofit projects that upgrade protection while preserving panel layout and conductors
• Replacement of a failed breaker in commercial or industrial electrical setups that rely on 3-phase protection

How to verify fit

1. Check your panel labeling for acceptable part numbers and ratings
2. Use LHF26400 as the primary compatibility reference to ensure a precise match
3. Confirm the circuit requires 400A and a 3-pole configuration before purchasing

Practical notes for installation and care

• Power down the panel and follow lockout/tagout procedures before handling any breakers
• Store and transport the breaker in protective packaging to prevent damage to terminals and ribs
• Keep a spare on hand for routine maintenance planning to minimize downtime