Merlin Gerin | NSJ400N | Circuit Breaker | 400A | 3-Pole | 600V | 35kA | Bolt-On

Meet the Merlin Gerin NSJ400N Circuit Breaker — a purpose-built, bolt-on protection solution designed for demanding 3-phase systems. This 400A, 3-pole device delivers dependable overcurrent protection for industrial and commercial panels, making it a precise fit for maintenance, retrofit, and replacement projects where exact specifications matter.

• Ampere rating: 400A
• Poles: 3-Pole
• Voltage: 600V
• Interrupting capacity: 35kA
• Mounting: Bolt-On
• Part reference: NSJ400N

The NSJ400N is purpose-built for panels and equipment that require an exact spec match. Its bolt-on design enables secure, durable mounting in compatible enclosures, helping minimize downtime during installation or replacement. With a robust 35kA short-circuit rating, it provides significant protection against high-energy faults typical in heavy machinery and large motor drives, while the 600V rating covers a wide range of commercial and industrial distributions.

Who benefits most

This breaker is ideal for facilities and projects where a precise Merlin Gerin specification is essential—for example, refits of legacy panels, retrofits in existing electrical rooms, or replacements that must align with established panel inventories. It’s well-suited for manufacturing lines, HVAC shutdown safeguards, data-center feeder protection, and other three-phase distribution needs where reliability and exact compatibility matter.

Why this NSJ400N stands out

• Exact spec match: Designed to align with Merlin Gerin systems, ensuring fit, function, and electrical coordination with existing protection schemes.
• High-capacity protection: 35kA interrupting rating provides solid defense against severe fault currents common in industrial environments.
• Secure mounting: Bolt-On construction offers a solid, vibration-resistant connection in compatible panels.
• Clear reference for compatibility: The part number NSJ400N is the best reference when confirming compatibility with your equipment.

Before ordering, verify that your panel or enclosure is compatible with a 3-pole, 600V, 400A bolt-on breaker of this exact design. The NSJ400N is a practical, long-lasting choice for projects that demand precise specification alignment and reliable, durable performance in demanding electrical environments.