Square D | NEF36800LS | Circuit Breaker | 800A | 600V

Square D NEF36800LS circuit breaker is a high-capacity protective device designed to safeguard demanding electrical systems. With an 800A rating at 600V, it’s built to handle substantial load banks in industrial and commercial environments. This breaker excels in maintenance, retrofit, and replacement projects where exact specifications matter, helping you keep critical power systems online with minimal downtime.

Key specifications

• Amperage: 800A
• Voltage: 600V
• Part number: NEF36800LS
• Compatibility note: The part number NEF36800LS is the best reference for compatibility; confirm fit and ratings before ordering.

Designed for demanding applications

Engineered for reliability in high-load environments, this Square D breaker provides robust protection for main distribution panels and feeders that serve large equipment, manufacturing lines, or data-center support infrastructure. Its 600V rating ensures compatibility with common industrial and commercial switchgear, while the 800A capacity covers heavy-duty service entrances and feeder circuits. Use NEF36800LS in installations where accurate matching of amperage, voltage, and physical form factor is critical to maintain electrical code compliance and system safety.

Ideal for maintenance, retrofit, and replacement

This unit is purpose-built for projects that require:

• Maintenance replacements to restore original protection and performance
• Retrofits where existing gear must be updated to meet new load demands
• Precise compatibility with your existing Square D panels and accessory kits

Before ordering, verify the fit and ratings against your panel labeling and the equipment sheet. Using the correct part number ensures you don’t encounter mismatches that could affect protection settings or trip characteristics.

Practical use cases

• Replacing a failed main or feeder breaker in a high-load industrial panel
• Upgrading electrical distribution to accommodate increased equipment demand
• Retrofit projects where equipment or layout has changed but protection requirements remain fixed

Why this matters

Choosing the right 800A, 600V circuit breaker isn’t just about capacity—it’s about precise compatibility with your control wiring, mounting configuration, and panel family. The NEF36800LS provides a clear, auditable reference for installation teams, reducing guesswork and downtime associated with ammeter/voltage mismatches. By aligning with the exact part number, you ensure reliable trip performance, predictable maintenance windows, and continued protection of your critical loads.