Schneider ElectricLJA36400U43X
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Schneider Electric LJA36400U44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Schneider Electric
LJA36400U44X
Molded Case Circuit Breaker
Brand
Schneider Electric
SKU
LJA36400U44X
Quantity
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Schneider Electric LJA36400U44X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Schneider Electric LJA36400U44X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Schneider Electric |
|---|---|
| Part Number | LJA36400U44X |
| Series | LJA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (2) 2/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 6.3A Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, 80% Rated, Visual Trip Indicator, True RMS Sensing, HACR Rated, RoHS Compliant, Mercury Free |
Quantity
Schneider Electric LJA36400U44X - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Schneider Electric |
|---|---|
| Series | LJA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (2) 2/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 6.3A Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, 80% Rated, Visual Trip Indicator, True RMS Sensing, HACR Rated, RoHS Compliant, Mercury Free |
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Description
Built for heavy-duty industrial applications, this 400-amp PowerPacT L-Frame breaker offers sophisticated system coordination. It mounts into standard Square D I-Line panelboards, providing a secure and efficient connection without extensive wiring. The standout feature is its MicroLogic 6.3A LSIG trip unit, which allows precise adjustments for Long-Time, Short-Time, Instantaneous, and Ground Fault settings to optimize safety and minimize nuisance tripping across complex networks.Specifications
| Brand | Schneider Electric |
|---|---|
| Part Number | LJA36400U44X |
| Series | LJA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (2) 2/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 6.3A Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, 80% Rated, Visual Trip Indicator, True RMS Sensing, HACR Rated, RoHS Compliant, Mercury Free |
Product FAQs
6 answersWhat type of panelboards are compatible with the LJA36400U44X?
This circuit breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards. It cannot be installed in standard unit-mount or NQ/NF series panels.
How does the LJA36400U44X mount into the electrical panel?
It utilizes the Square D I-Line plug-in mounting system. The breaker snaps directly onto the I-Line bus stack, which eliminates the need for extensive busbar bolting and speeds up the installation process.
What does the U44X designation mean on this PowerPacT L-frame breaker?
The U44X suffix indicates the breaker is equipped with a Micrologic 6.3A electronic trip unit. This provides LSIG (Long-Time, Short-Time, Instantaneous, and Ground-Fault) protection along with integrated ammeter capabilities for advanced system monitoring.
What wire sizes are accepted by the lugs on the LJA36400U44X?
The factory-installed mechanical lugs accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase, which easily accommodates parallel conductor runs for high-amperage applications.
Can the trip settings on the LJA36400U44X be adjusted in the field?
Yes. The Micrologic 6.3A trip unit features fully adjustable dials for Long-Time, Short-Time, Instantaneous, and Ground-Fault pickup and delay settings. This allows precise coordination with your specific system requirements to optimize safety and minimize nuisance tripping.
Can the LJA36400U44X replace older Square D L-frame breakers?
Yes, PowerPacT L-frame I-Line breakers can replace legacy Square D LA or LH I-Line breakers of the same amperage and pole configuration. The electronic trip unit on the LJA36400U44X offers more advanced coordination than older thermal-magnetic models.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 4 reviews.
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Rating
4 reviews
- BWBrian W.Verified BuyerReviewingSquare D LJA36400U31X - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/27/26Great!
Quick delivery
- JBJeffrey B.Verified BuyerReviewingSquare D LJA36600U31X - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/20/26Purchased breaker - Great experience
We recently needed to purchase a specialty breaker for a large commercial project. Zach, our account manager sprung into action and really made this a white glove experience. From communication to speed I was impressed the entire process. Will definitely be using super breakers for our future breaker needs. Would 1500% recommend!
- EVErik V.Verified BuyerReviewingSchneider Electric LJA36600U44X - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26Purchase was easy.
The part was as described. Packing was excellent.
Thank you for the quick ship!
- KPKevin P.ReviewingSquare D LJA36600U31X - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars11/1/21Easy to order
fast shipping good condition