Square D LH36400 - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D LH36400 — a rugged 400 A, 600 V, 3-pole plug-in molded case circuit breaker engineered to shield your electrical system from overcurrent and short-circuit events. Built for dependable protection in panelboards and load centers, it delivers fast installation and reliable performance when it matters most.

Why the LH36400 stands out

• Fast plug-in connection for quick installation and seamless replacement, minimizing downtime during upgrades or service calls.
• Thermal-magnetic trip unit provides stable, repeatable protection by detecting both gradual overloads and instantaneous short circuits, helping to prevent damage to downstream equipment.
• OEM-compatible design engineered to work with matching Square D load centers and panelboards, ensuring proper fit, coordinated trip settings, and reliable performance.
• Built for versatility ideal for residential, commercial, and light industrial applications where large branch circuits require robust protection and easy upkeep.

What it does for your electrical system

The LH36400 protects branch circuits from overcurrent and short circuits, safeguarding wiring, devices, and downstream equipment. Its molded-case construction adds physical durability, while the plug-in mounting simplifies commissioning, maintenance, and part replacements. Whether you're upgrading existing panels or configuring new installations, this breaker delivers predictable trip characteristics and long-term reliability.

Technical at a glance

• Manufacturer: Square D
• Part number: LH36400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Plug-in
• Applications: Branch circuit overcurrent and short-circuit protection

Who should consider this breaker

• Electricians and facilities teams upgrading panelboards or load centers that handle high-current feeders
• Commercial spaces and light industrial environments needing reliable 400 A protection
• Projects requiring quick swap-ins or replacements with compatible Square D OEM equipment

Choose the Square D LH36400 for a dependable, high-capacity plug-in solution that aligns with your panelboard ecosystem, delivers precise protection, and keeps downtime to a minimum. It’s the practical choice when performance matters as much as simplicity.