LM3900L | Circuit Breaker | 900A | 3-Pole | 600V

The LM3900L is a rugged, industrial-grade three-pole circuit breaker designed to protect and sustain demanding power systems at 600V. With a robust 900A rating, this device is built to interrupt significant fault currents quickly, helping to minimize damage to equipment and reduce downtime in critical electrical infrastructure.

Designed for maintenance, retrofit, and replacement projects, the LM3900L is a practical fit when your panels or switchgear require a matching 3-pole, 600V protection solution. The part number LM3900L serves as the most reliable reference for compatibility, ensuring you lock in the right device for your specific installation.

Why choose the LM3900L?

• Three-pole protection: Simultaneous interruption across all three phases to safeguard three-phase systems and motors.
• High-capacity interrupting capability: 900A rating delivers reliable overcurrent protection for heavy-duty applications.
• 600V operating range: Suitable for common industrial distribution circuits and motor control environments.
• Easy fitment and compatibility: Use the LM3900L part number as the best reference, and verify fit and ratings before ordering to ensure seamless replacement or retrofit.
• Maintenance-friendly and retrofit-ready: A practical choice for upgrading existing panels or replacing worn-out breakers without overhauling the entire system.

Ideal use cases

• Maintenance and modernization of industrial control panels and switchgear that require a 3-pole, 600V breaker.
• Retrofit projects where upgrading to a higher-capacity, reliable protection device is necessary to support upgraded loads.
• Replacement in service to restore protective performance without changing the surrounding electrical architecture.
• Three-phase motor circuits and distributing feeders in commercial or light industrial environments.

Important: Confirm fit and ratings before ordering. The LM3900L part number is the best reference for compatibility with your current equipment, panel schedule, and protective coordination. If you’re matching to an existing assembly, double-check busbar size, mounting style, and trip coordination to ensure smooth integration—and you’ll have a dependable, long-lasting safeguard for your electrical system.

Specifications at a glance

• Amperage: 900A
• Poles: 3-Pole
• Voltage: 600V