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Feels well-built and suitable for everyday plant and maintenance use.
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Circuit Breaker
Square D | LLA36400U43X | Circuit Breaker | 400A | 3-Pole
| Amperes | 400 |
| Poles | 3 |
| Product Type | Circuit Breaker |
Regular price
$510.00
Sale price
$510.00
Regular price
Unit price
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Seamless online shopping experience guaranteed with easy shipping and returns policy.
Shop with Confidence: Our Products come with a Reliable Year-Long Warranty.
Square D | LLA36400U43X | Circuit Breaker | 400A | 3-Pole
Regular price
$510.00
Sale price
$510.00
Regular price
Unit price
Product description
Shipping
Introducing the Square D LLA36400U43X circuit breaker—a rugged 400A, 3-Pole protection device designed to deliver reliable performance in demanding electrical environments. Identified by part number LLA36400U43X, this unit is a precise match for maintenance, retrofit, and replacement projects where exact specifications matter.
Key specifications and compatibility
Amperage: 400A
Poles: 3-Pole
Important: confirm fit and ratings before ordering. The part number LLA36400U43X serves as the best reference to ensure compatibility with your Square D panel and its trip characteristics.
Why this 3-Pole breaker matters
Three-pole protection is essential for maintaining balanced three-phase systems. This breaker delivers synchronized protection across all phases, helping prevent overloads, arcing, and faults in commercial or industrial equipment.
Ideal use cases
- Maintenance: service existing Square D installations while preserving accurate protection specs.
- Retrofit: upgrade or replace aging protection with a direct-match part to maintain system integrity.
- Replacement: quickly swap a failed unit with a part-number-specific breaker to minimize downtime.
Practical guidance for selecting and installing
- Use the part number LLA36400U43X as the primary reference when verifying compatibility with your panel model and rating.
- Check the panel labeling to ensure the amperage and 3-Pole configuration are permitted for your specific installation.
- Match the replacement’s trip characteristics and mounting style to your existing Square D setup to maintain consistent protection behavior.
Why choose Square D for your system
Square D is trusted for durable, field-proven circuit protection. The LLA36400U43X 400A, 3-Pole breaker is designed to integrate with compatible Square D panels, delivering dependable performance under demanding loads and environments.
Ready to secure exact-fit protection? Add the LLA36400U43X to your cart and proceed with confidence, knowing you have a precise, compatible part for maintenance, retrofit, or replacement needs.
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What Our Customers Say
General feedback we often hear from customers purchasing industrial electrical parts.
Verified
Lead time was reasonable and the part matched expectations when it arrived.
Procurement · Ontario
Verified
Good value for industrial use. Customers mention easy installation.
Service tech · Field work
