Square D LHL26400MB 400A 2-Pole 600 V Circuit Breaker

Power heavy electrical systems with confidence using the Square D LHL26400MB 400A 2-Pole 600 V Circuit Breaker. Built by Square D for demanding commercial and industrial panels, this unit delivers robust overload protection for high-current feeders while maintaining dependable operation in challenging environments. The part number LHL26400MB ensures you’re selecting a genuine Square D component designed for long service in critical electrical installations.

Key specifications

• Current rating: 400 A
• Poles: 2
• Voltage rating: 600 V
• Part number: LHL26400MB
• Brand: Square D

Why this 400A, 2-Pole breaker makes sense

When you’re protecting large feeders or main distribution circuits, a 400 A, 2-Pole design provides simultaneous protection of both hot legs and a common trip. With a 600 V rating, it’s suited for panels and equipment operating at higher voltage levels, helping to prevent costly fault currents from propagating through your system. This unit integrates into Square D panel ecosystems that accept LHL-series devices, delivering consistent trip performance and mechanical fit with compatible bus bars and mounting footprints.

Ideal use cases

Best-suited for:

• Industrial control panels and main distribution panels that require a 400 A feeder breaker
• Commercial electrical installations with two hot legs and a 600 V maximum system rating
• Upgrades or replacements in Square D panels designed for LHL-series devices

Installation and maintenance tips

• Verify compatibility with your panel’s bus type and confirm it accepts LHL26400MB devices.
• Power down the equipment and follow standard lockout/tagout procedures before installation or replacement.
• Ensure terminals are torqued to the panel manufacturer’s specifications and seating is secure to maintain reliable operation.
• Use this breaker as part of a balanced protection strategy for feeders to reduce nuisance trips and maintain system integrity.

Why choose Square D for your protection needs?

Square D, part of Schneider Electric, brings decades of electrical protection expertise to the LHL family. The LHL26400MB 400A 2-Pole 600 V circuit breaker combines trusted protection, clear trip indicators, and a form factor designed for compatibility with a broad range of panels. Choosing this unit means you’re investing in a component with established performance, availability, and support across industrial and commercial installations.