Verified
Solid quality component. Exactly as described on the product page.
Maintenance team · Ontario
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circuit-breaker
Square D LLL36400U31X Circuit Breaker, 400A, 3-Pole, 600V
| Part Number | LLL36400U31X |
| Amperes | 400 |
| Poles | 3 |
| Voltage | 600 |
| Product Type | circuit-breaker |
Regular price
$30,425.00
Sale price
$30,425.00
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 LLL36400U31X Circuit Breaker, 400A, 3-Pole, 600V
Regular price
$30,425.00
Sale price
$30,425.00
Regular price
Unit price
Product description
Shipping
Meet the Square D LLL36400U31X circuit breaker — a rugged, industrial-grade safety device engineered for demanding electrical environments. With a 400 A rating, a 3-pole configuration for three-phase systems, and a 600 V maximum, this breaker is designed to protect your power distribution from faults while supporting reliable operation in heavy-use facilities.
Key specifications
- Brand: Square D
- Part Number: LLL36400U31X
- Amperage: 400 A
- Poles: 3-pole
- Voltage rating: 600 V
Why this model stands out
- Direct-fit for industrial service panels — designed to integrate with Square D panel systems and compatible installations when paired with the correct part number and application configuration.
- Three-phase protection — the 3-pole design ensures coordinated interruption across all phases, helping prevent unbalanced faults and protecting connected equipment.
- Clear compatibility pathway — use the part number LLL36400U31X to confirm fit for your specific panel and service requirements. If you’re unsure, our team can help verify the match.
Ideal use cases
- Industrial electrical service installations needing robust protection for main feeders or large branch circuits.
- Maintenance projects replacing aging breakers to restore reliable trip performance and safety.
- System upgrades in manufacturing facilities, data centers, or large commercial/industrial sites operating on 3-phase 600 V systems.
How it protects your operation
- Quickly interrupts fault currents to shield equipment and personnel.
- Supports safer, more dependable electrical distribution under heavy loads.
- Streamlines procurement and maintenance by centering decisions on a single part number for compatibility checks.
Getting the right fit
To verify fit, compare your equipment requirements with the LLL36400U31X specifications and your panel’s documentation. If you need assistance matching a part number or confirming compatibility for your application, send us a message and we’ll help you confirm the right fit.
Contact sales@ampstate.com
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What Our Customers Say
General feedback we often hear from customers purchasing industrial electrical parts.
Verified
Packaging was secure and the item arrived clean and ready for installation.
Electrical contractor · GTA
Verified
We’ve used this type on multiple jobs and it’s been reliable so far.
Panel shop · Canada/US
