LA36400 - 400 Amp Circuit Breaker

LA36400 - 400 Amp Circuit Breaker

When your system demands dependable, heavy-duty circuit protection, the Square D LA36400 delivers. This 3-pole, 400-amp circuit breaker is built for industrial and commercial environments where high fault currents and harsh conditions are common. With a maximum voltage rating of 600 VAC and a breaking capacity of 22 kA at 600 V, it stands ready to safeguard your electrical distribution against overloads and short circuits. Its thermal-magnetic trip mechanism ensures fast, precise response to abnormal current, reducing the risk to connected equipment and minimizing downtime.

Key Features and Benefits

• High Current Capacity: Rated at 400 A—ideal for heavy loads or core feeders.
• Thermal-Magnetic Trip: Combines long-time and instantaneous protection in one switch to respond intelligently to overcurrent conditions.
• Plug-in / I-Line Compatibility: Easy installation into I-Line panelboards; also supports unit-mount or rear-connect setups.
• Durable Build in Harsh Environments: Designed to stand up to vibration, temperature changes, and heavy use without performance degradation.
• Certified Safety: UL Listing and CSA approval confirm this breaker meets rigorous industrial safety standards.

Technical Specifications

• Product Type: Molded-case circuit breaker
• Rated Current: 400 A
• Poles: 3
• Voltage Rating: 600 VAC / 250 VDC
• Breaking Capacity: 22 kA @ 600 VAC
• Alternative Interrupting Ratings: 30 kA @ 480 V, 42 kA @ 240 V
• Trip Technology: Thermal-magnetic
• Mounting / Connection: Plug-in (I-Line), unit mount, rear connect
• Dimensions (H × W × D): 11″ × 6″ × 5.84″
• Approx. Weight: ~18.3 lb
• Trip Range (Magnetic): ~2,000 A hold, 4,000 A trip

Material Compliance and Certifications

• RoHS / REACH Compliant: Free of harmful substances like mercury, PVC, halogens.
• UL Listed / CSA Approved: Ensures conformance with North American industrial standards.
• Environmental Disclosure / Green Premium: Schneider Electric publishes life-cycle and material transparency data.

Where It Works Best

• The LA36400 shines in environments that demand high reliability and strong fault-current handling. It’s ideal for:
  • Industrial power distribution panels supplying motors, heavy machinery, or HVAC systems
  • Commercial facilities with large electrical loads or central feeders
  • Hybrid systems where both AC and DC protection may be required
  • Retrofit or upgrade projects where panelboards use I-Line architecture