Square D | LLN36400CU33XAFSOHJ00 | Circuit Breaker | 400A | 3-Pole | 600V | Plug-In

Meet the Square D LLN36400CU33XAFSOHJ00—a purpose-built plug-in circuit breaker engineered for demanding 400-amp, 3-pole protection in 600-volt distribution networks. This unit is ideal for maintenance, retrofit, and replacement projects where exact compatibility and fast, downtime-minimizing installation matter most.

Why this plug-in breaker stands out

• Exact-match compatibility: Designed for Square D plug-in panels, with the part number LLN36400CU33XAFSOHJ00 serving as your best reference for fit and ratings.
• Effortless retrofit and replacement: The plug-in format enables quick swaps, reducing panel downtime and labor needs during upgrades or servicing.
• Reliable three-phase protection: Three poles coordinate trips across all phases, safeguarding equipment from unbalanced faults and three-phase faults that can cripple production lines.
• High-current capability: 400A rating supports large feeders and motor circuits, making it suitable for demanding industrial and commercial applications.
• 600V system readiness: Built to handle medium-voltage distribution scenarios common in manufacturing, utilities, and large facilities.

Practical use cases

In manufacturing environments, use this breaker to protect feeders feeding essential machinery, conveyors, and motor control centers. For retrofit projects, it serves as a dependable drop-in replacement where your panel requires a 3-pole, 600V rated solution with a 400A capacity. In commercial and institutional facilities, it helps safeguard critical distribution panels that power heavy-load equipment while enabling swift maintenance planning.

What matters to you in operation

With a plug-in design and a clear path to compatibility, this breaker minimizes installation complexity and panel downtime. The 3-pole configuration ensures coordinated protection across all phases, reducing the risk of partial tripping that can leave equipment exposed. And because compatibility hinges on the exact part number, using LLN36400CU33XAFSOHJ00 as your guide helps avoid mismatches and unsafe installations.

Compatibility guidance

The most reliable reference for compatibility is the part number LLN36400CU33XAFSOHJ00. Before placing an order, verify that your panel model and bus type align with this 3-pole, 400A, 600V plug-in breaker to ensure seamless integration and optimal protection.

Key specifications

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Configuration: Plug-In
• Part number: LLN36400CU33XAFSOHJ00