Square D LHL26400 - 400 A, 600 V, 2-Pole Circuit Breaker | AmpState

Built by Square D, the LHL26400 is a 400 A, 600 V, 2-pole molded case circuit breaker designed to protect branch circuits in panelboards and load centers. Its compact molded case design helps you maximize panel space without sacrificing protection, making it ideal for installations where space is at a premium.

Engineered for dependable protection, the thermal-magnetic trip unit delivers stable, repeatable overcurrent and short-circuit protection. This means fewer nuisance trips during minor faults and reliable interruption when faults occur, safeguarding wiring, devices, and downstream equipment.

Key Features

• Compact molded case design—efficient use of panel space while delivering robust protection.
• Thermal-magnetic trip unit—provides stable response to both overloads and short circuits for consistent performance.
• 2-pole configuration—shared trip across both poles for coordinated protection of multi-conductor circuits.
• 400 A rating—suitable for main feeders and higher-current branch circuits in commercial or light industrial settings.
• 600 V rating— designed for a wide range of electrical systems and panelboard applications.
• OEM panel compatibility— engineered to align with matching Square D load centers and panelboards for straightforward replacement and reliable fitment.
• Versatile application— appropriate for residential, commercial, and light industrial protection schemes seeking dependable circuit interruption.

Technical Specifications

• Manufacturer: Square D
• Part Number: LHL26400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 2
• Application: Branch circuit overcurrent and short-circuit protection

Why choose the Square D LHL26400

This breaker is built for panels that demand space-efficient protection without compromising reliability. The combination of a compact form factor and a precise thermal-magnetic trip mechanism means easier panel planning, fewer thermal constraints, and predictable protection aligned with downstream devices and wiring. Its compatibility with OEM load centers reduces retrofit complexity and helps maintain consistent performance across your electrical distribution system.

Ideal use cases

• Main feeder protection in service panels where space is limited but high-current capability is required.
• Branch circuit protection for commercial lighting, receptacle circuits, and equipment feeders in small to mid-size facilities.
• Light industrial applications where dependable 2-pole protection at 400 A is needed within standard panelboards.
• Retrofits or replacements in Square D panelboards seeking a compatible, reliable LHL26400 solution.

Installation and compatibility tips

Pair this 400 A, 600 V, 2-pole molded case breaker with matching Square D panelboards and load centers to ensure optimal fit and coordinated protection. Verify that the overall system design aligns with the 2-pole configuration and that electrical wiring conforms to local codes and manufacturer guidelines. For long-term reliability, ensure secure mounting and proper terminal torque during installation.

Ready for your project

With its robust protection, space-conscious design, and OEM-compatible fit, the Square D LHL26400 from AmpState is poised to deliver dependable branch-circuit protection for a range of commercial and light industrial applications. If you’re upgrading, retrofitting, or specifying a main-feeder breaker for a panel, this 400 A, 600 V, 2-pole solution offers practical, proven performance that engineers and electricians trust.