Cutler Hammer LB3400 - 400A, 3-Pole, Circuit Breaker

The Cutler Hammer LB3400 is a rugged, high-capacity circuit breaker designed to deliver reliable overcurrent protection in demanding electrical environments. With a 400A rating and a three-pole configuration, it’s built to handle the demands of three-phase power distribution with precision and safety.

Key features that set the LB3400 apart:

• Current rating: 400A — built to safeguard heavy feeder circuits and large motor loads without nuisance tripping.
• Poles: 3-Pole — ideal for three-phase panelboards, switchboards, and control panels where balanced protection is essential.
• Breaker type: Circuit Breaker — provides automatic interruption during overcurrent events to protect wiring and equipment.
• Versatile mounting and integration: Suitable for installation in distribution panels and motor control centers, as well as OEM applications requiring robust overcurrent protection.
• Application breadth: Trusted choice for industrial and commercial settings where dependable operation and safety are non-negotiable.

Why this matters in real-world use cases:

• In a manufacturing line with multiple large motors, the LB3400 helps prevent cascading faults by isolating the faulty section quickly, reducing downtime and equipment damage.
• For a distribution panel serving critical facilities, the 3-pole configuration ensures balanced protection across all three phases, supporting stable operation and easier fault diagnosis.
• In OEM projects, the LB3400 offers a reliable baseline protection device that teams can trust to meet stringent performance requirements without compromising panel space or compatibility.

Practical considerations for deployment:

• Ensure compatibility with your panelboard or switchboard’s bus configuration and three-phase system design to maximize protection and reliability.
• Use in motor control centers where dependable, immediate disconnection under fault conditions is essential to protect motors, drives, and feeders.
• Pair with appropriate upstream protective devices and scene-appropriate fault-setting practices to optimize safety and uptime.

Choosing the Cutler Hammer LB3400 means opting for a durable, industrial-grade overcurrent protection solution that keeps distribution panels, motor control centers, and critical electrical systems safe and operational. With its proven 400A, 3-Pole configuration, this circuit breaker is a strategic fit for applications that demand consistent performance, reduced risk, and long service life.