Eaton | HFB1040L | Circuit Breaker | 40A | 347V

Introducing the Eaton HFB1040L circuit breaker — a purpose-built protection device tailored for 347V electrical environments that demand precise 40A protection. This unit is engineered for maintenance, retrofit, and replacement projects where matching specs matters and downtime is minimized.

Key specifications

• Amperage: 40A
• Voltage rating: 347V
• Model: Eaton HFB1040L

What makes this breaker unique

Designed to integrate seamlessly with Eaton panels and original electricals, the HFB1040L delivers dependable current interruption that aligns with the system’s intended protection profile. Its 347V rating makes it well-suited for higher-voltage commercial and industrial circuits, while the 40A setting provides precise overcurrent protection for feeders and branch circuits. Because it’s an Eaton component, you benefit from consistent mounting footprints, reliable performance, and compatibility with existing Eaton infrastructures.

Ideal use cases

• Maintenance: replace aging or worn-out breakers in 347V circuits to restore reliable protection.
• Retrofit: upgrade or reconfigure existing Eaton-based electrical systems while maintaining original protection characteristics.
• Replacement: match exact specs during panel repairs, ensuring continued compliance and safe operation.

Why choose this for your project

The HFB1040L is more than a generic component — it’s a part with a specific fit and rating designed to work in tandem with Eaton’s hardware and engineering standards. By selecting the exact model, you preserve system integrity, minimize troubleshooting, and maintain consistent electrical protection across your installation.

Compatibility and ordering notes

Important: Confirm fit and ratings before ordering. The part number HFB1040L is the best reference for compatibility with your panel or distribution setup.