LI36400 - 400 Amp Circuit Breaker

LI36400 - 400 Amp Circuit Breaker

Guard your heavy-duty power infrastructure with the LI36400 400 Amp circuit breaker — engineered to deliver dependable protection under the toughest conditions. Whether you're managing a manufacturing floor, data center, or critical facility, this breaker gives you full thermal overload and instantaneous magnetic short-circuit defense in a compact, field-friendly design. With three poles and a well-balanced footprint, it integrates neatly into load centers or main distribution panels while giving you peace of mind that your equipment stays safe, even during electrical stresses.

Key Features and Benefits

• Hybrid Thermal-Magnetic Protection: Combines accurate, long-term overload sensing with ultra-fast magnetic trip during short faults, helping prevent both slow damage and catastrophic failures.
• Heavy Duty Molded Case Construction: Built from high-strength insulating material that resists heat, moisture, and mechanical stress, so it holds up in harsh environments.
• I-Line Panelboard Ready: Designed to snap into I-Line panelboards, making replacement or retrofitting simpler and reducing labor time.
• High Interrupting Rating: Capable of interrupting up to 100 kA at 600 VAC, and 200 kA at both 480 VAC and 240 VAC, so it handles fault currents in demanding systems.
• Compact Form Factor: At 7.50" wide × 14.00" long × 5.50" deep, it optimizes space usage in electrical enclosures.
• Temperature Rated Performance: Verified to operate correctly at ambient 40 °C, which covers most real-world installation environments.

Technical Specifications

• Poles: 3
  
• Rated Current: 400 A
  
• Interrupting Capacity:
  • 100 kA @ 600 VAC
  • 200 kA @ 480 VAC
  • 200 kA @ 240 VAC
• Frame Type: LC
  
• Frequency: 60 Hz
  
• Ambient Temperature Rating: 40 °C
  
• Dimensions (W × L × D): 7.50" × 14.00" × 5.50"
  
• Weight: 30 lbs
  

Material Compliance and Certifications

• The LI36400 is manufactured in accordance with UL, CSA, and NEC standards, ensuring that safety and reliability are built in from the ground up.
• All internal components are selected for quality and durability, with insulation and contacts engineered to meet or exceed industry safety thresholds.
• The molded case is tested for thermal stability and mechanical integrity under stress, giving you confidence that it will perform as expected through years of demanding operation.

Where It Works Best

• The LI36400 breaker excels in scenarios where large electrical loads need protection without compromise. It’s a go-to option for:
• Industrial plants with heavy motors, welders, or large drives
• Commercial facilities such as hospitals, shopping complexes, and data centers
• Critical infrastructure — HVAC plants, backup power systems, or central energy distribution
• Retrofit or upgrade projects when migrating older panels to I-Line form factor
• Systems where high fault current capability is required for safety and compliance