Schneider ElectricLJA36400CU43X
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Schneider Electric LJA36400CU44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Schneider Electric
LJA36400CU44X
Molded Case Circuit Breaker
Brand
Schneider Electric
SKU
LJA36400CU44X
Quantity
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Schneider Electric LJA36400CU44X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Schneider Electric LJA36400CU44X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Schneider Electric |
|---|---|
| Part Number | LJA36400CU44X |
| 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, Padlock Attachment, Motor Operator, 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 | 100% Rated, Current Limiting, HACR Rated, Reverse Feed, True RMS Sensing, Visual Trip Indicator, Phase Loss Protection |
Quantity
Schneider Electric LJA36400CU44X - 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, Padlock Attachment, Motor Operator, 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 | 100% Rated, Current Limiting, HACR Rated, Reverse Feed, True RMS Sensing, Visual Trip Indicator, Phase Loss Protection |
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Description
Built for demanding applications, the Schneider Electric LJA36400CU44X is a 400A, 3-pole PowerPacT L-Frame MCCB. It delivers robust protection for Square D I-Line panelboards and switchboards. This unit features an I-Line plug-on connection on the line side and mechanical lugs on the load side. It accepts two 2/0 AWG to 500 kcmil conductors for flexible wiring. Rated for 65 kAIC at 480VAC, this 100% rated breaker includes a MicroLogic 6.3A trip unit for adjustable LSIG protection.Specifications
| Brand | Schneider Electric |
|---|---|
| Part Number | LJA36400CU44X |
| 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, Padlock Attachment, Motor Operator, 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 | 100% Rated, Current Limiting, HACR Rated, Reverse Feed, True RMS Sensing, Visual Trip Indicator, Phase Loss Protection |
Product FAQs
7 answersWhat does the "C" in the LJA36400CU44X catalog number signify?
The "C" indicates that this circuit breaker is 100% rated. This means it can carry its full 400A continuous current rating without the standard 80% derating requirement, provided it is installed in an enclosure approved for 100% rated operation.
What specific trip unit is included with the LJA36400CU44X?
The "U44X" suffix designates a MicroLogic 6.3 A (Ammeter) electronic trip unit. This provides adjustable Long-Time, Short-Time, Instantaneous, and Ground-Fault (LSIG) protection, along with integrated current monitoring capabilities.
How is the LJA36400CU44X physically installed into a system?
This breaker features an I-Line plug-on connection on the line side, allowing it to snap directly onto the bus of a Square D I-Line panelboard or switchboard. The load side utilizes standard mechanical lugs.
What are the wire size requirements for the load-side lugs?
The factory-installed mechanical lugs on this 400A breaker accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Does the LJA36400CU44X provide equipment ground-fault protection?
Yes. The included MicroLogic 6.3 A trip unit features the "G" in its LSIG profile, providing adjustable ground-fault protection to safeguard equipment against low-level arcing faults.
Can the PowerPacT LJA36400CU44X replace older Square D 400A breakers?
Yes, the PowerPacT L-frame is the modern replacement for legacy Square D LA and LH frame I-Line breakers. Because this specific model is 100% rated and uses an electronic trip unit, you must verify that your existing enclosure is approved for 100% rated applications.
Can this breaker be installed in a standard Square D QO or NQ panelboard?
No. The LJA36400CU44X is strictly designed for Square D I-Line panelboards and switchboards. It will not fit in NQ, NF, or standard unit-mount enclosures.
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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