LGF36400U31X - 400 Amp Circuit Breaker

LGF36400U31X - 400 Amp Circuit Breaker

When you need dependable protection for critical electrical systems, the LGF36400U31X PowerPacT L-Frame 400 A Circuit Breaker delivers the performance you can count on. With its 3-pole design rated at 600 VAC and an interrupting capacity up to 18 kA (at 600 V), this breaker stands ready to handle high fault conditions. Built with MicroLogic 3.3 electronic trip logic and dual-break rotating contacts, it sharply reduces peak current during fault events, helping protect downstream equipment. It’s engineered for flexibility—offered in both 3- and 4-pole versions, in unit-mount or busbar installation styles, and equipped with a push-to-trip button for convenient manual testing. Whether you’re setting up a control panel or safeguarding a power distribution network, this breaker blends precision protection with adaptability.

Key Features and Benefits

• High Fault Interruption Ability: Rated at 65 kA at 240 V, 35 kA at 480 V, and 18 kA at 600 V, it handles severe fault conditions with confidence.
• Accurate Trip Control: The MicroLogic 3.3 trip unit with LI (long-time/instantaneous) function ensures precise response to overloads and short circuits.
• Current Limiting Action: Dual-break rotating contacts reduce peak current stress during faults, minimizing damage.
• Flexible Installation Options: Available in unit-mount or busbar configurations and in 3- or 4-pole layouts to suit your layout.
• Built-in Test Capability: Push-to-trip button enables quick manual testing without removing the device.
• Field-Ready Compatibility: Supports optional accessories (e.g. auxiliary switches, shunt trips) and common trip functionality.

Technical Specifications

• Rated Operational Voltage: 600 V AC, 50/60 Hz
• Rated Insulation Voltage: 750 V (IEC 60947-2)
• Impulse Withstand Voltage: 8 kV (IEC 60947-2)
• Interrupting / Breaking Capacity:
  • 65 kA @ 240 V
  • 35 kA @ 480 V
  • 18 kA @ 600 V
• Continuous Current Rating: 80 % of frame rating
• Trip Unit Type: Electronic, MicroLogic 3.3 (LI)
• Poles: 3 (with 4-pole option available)
• Mounting: Unit-mount busbar style
• Communication Interfaces: Modbus, Ethernet
• Dimensions:
  • Height: 13.4 in (340 mm)
  • Width: 5.5 in (140 mm)
  • Depth: 4.3 in (110 mm)
• Weight: 13.7 lb (6.2 kg)
• Ambient Operating Range: –25 °C to 70 °C (–13 °F to 158 °F)
• Altitude Rating: Up to 2,000 m without derating

Material Compliance and Certifications

• Certifications: UL 489, CSA, NEMA, NOM, IEC 60947-2, CE marked
• Environmental Compliance: RoHS (REACH) compliant; free of mercury and PVC beyond trace levels
• Warranty: 18-month standard warranty

Where It Works Best

• The LGF36400U31X shines when deployed as a main panel disconnect in demanding industrial or commercial switchgear. It’s especially suited for installations where you need both dependable protection and streamlined system integration—think motor control centers, large power distribution cabinets, or control rooms. Because of its unit-mount and busbar compatibility, it fits neatly into modular configurations and retrofit scenarios. Use it where you must shield sensitive loads (like drives, PLCs, or UPS systems) from high fault currents while maintaining flexibility for future expansion.