Schneider Electric | NSC400K3400K | Circuit Breaker | 400A | 3-Pole | 690V

Meet the Schneider Electric NSC400K3400K circuit breaker — a robust, high-capacity protective device built for demanding industrial power distribution. With a 400 A rating, three poles, and a 690 V maximum, it’s engineered to safeguard feeders, motors, and critical circuits in challenging environments while maintaining reliable protection and system integrity.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole
• Voltage rating: 690 V
• Part reference: NSC400K3400K
• Applications: suitable for maintenance, retrofit, and replacement where exact spec alignment is required

Why this Schneider Electric model stands out

• Exact-match replacement: Using the NSC400K3400K part number ensures mechanical fit and electrical coordination with your existing protection scheme, reducing downtime and rework.
• High-current, three-phase protection: Designed to reliably interrupt and protect 3-phase systems at 690 V, supporting safe operation of heavy feeders and motor loads.
• Retrofit-friendly for upgrades and maintenance: When upgrading aging panels or swapping out failed components, this unit provides a like-for-like solution that preserves system architecture.

Ideal applications

• Industrial facilities with 400 A feeders on 690 V networks
• Motor control centers and distribution panels undergoing retrofit or component replacement
• New installations requiring a precise, high-capacity 3-pole protection device within 690 V systems

Fit and compatibility guidance

Before ordering, confirm fit and ratings for your specific installation. The NSC400K3400K part number is your best reference for compatibility with existing Schneider Electric equipment and for maintaining consistent protection coordination across the system.

Practical tips for installation and maintenance

• Keep the original documentation handy and verify wiring connections and mounting fits align with your panel’s guidelines
• Record the replacement part number in your maintenance logs to streamline future service or part reorders
• Plan a controlled outage to test system performance after installation, verifying that protection operates as intended across all three phases

With the Schneider Electric NSC400K3400K, you gain a dependable, high-capacity protective device that fits seamlessly into 690 V, three-phase infrastructure, simplifying maintenance, retrofit projects, and long-term reliability.