Square D | NEF36900LI | Circuit Breaker | 900A | 3-Pole | 600V

Square D NEF36900LI circuit breaker delivers high-current protection for demanding 3-phase electrical systems. Rated at 900A and 600V, this 3-pole device is designed for maintenance, retrofit, and replacement projects where exact specifications matter. When in doubt, the part number NEF36900LI is the most reliable reference to ensure compatibility with Square D panels and feeders.

Key specifications

• Amperage: 900A
• Poles: 3-Pole
• Voltage: 600V
• Compatibility reference: NEF36900LI for accurate fit

What sets this breaker apart

This isn’t a generic high-current breaker. The NEF36900LI is built for reliability in industrial environments, delivering solid protection for large motor circuits and heavy feeders in 600V networks. Its design prioritizes precise fit within Square D enclosures, reducing installation friction during retrofits or panel upgrades and helping you maintain uninterrupted service in critical applications.

Ideal use cases

• Retrofitting aging switchgear or upgrading distribution panels in manufacturing facilities
• Replacing worn-out or incompatible breakers in 600V, 3-phase systems
• Protection for high-load feeders and large-motor circuits in industrial, commercial, and data-center environments

Fit, compatibility, and installation tips

Before ordering, confirm the fit and ratings match your current panel or enclosure. Use the NEF36900LI designation as the primary compatibility reference to ensure seamless replacement within Square D lineups. Always follow manufacturer safety instructions and have a licensed electrician verify installation in accordance with local electrical codes.

What you gain

• Reliable, high-current protection for critical 600V, 3-phase circuits
• Streamlined procurement with a clearly identifiable part number for exact compatibility
• Smooth retrofit experience that minimizes downtime and preserves panel integrity