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Square D LJA36250U31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Square D
LJA36250U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJA36250U31X
Quantity
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Square D LJA36250U31X - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LJA36250U31X - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | LJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 100-250A |
|---|
| Frame Type | L Frame |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (1) 2 AWG - 500 kcmil (Al) or (1) 2 AWG - 600 kcmil (Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 2 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | Micrologic 3.3 Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB1, NOM-003-SCFI-2000, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UKCA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free |
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Square D LJA36250U31X - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 100-250A |
|---|
| Frame Type | L Frame |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (1) 2 AWG - 500 kcmil (Al) or (1) 2 AWG - 600 kcmil (Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 2 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | Micrologic 3.3 Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB1, NOM-003-SCFI-2000, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UKCA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free |
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Description
Engineered for commercial and industrial power distribution, the Square D LJA36250U31X is a 3-pole, 250A electronic trip molded case circuit breaker. It is part of the robust PowerPacT L-Frame family, designed to handle demanding electrical environments. This breaker installs into Square D I-Line panelboards and switchboards, utilizing a plug-on line connection and load-side lugs. It features a Micrologic 3.3 trip unit, delivering adjustable long-time and instantaneous (LI) protection.Specifications
| Brand | Square D |
|---|---|
| Series | LJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 100-250A |
|---|
| Frame Type | L Frame |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (1) 2 AWG - 500 kcmil (Al) or (1) 2 AWG - 600 kcmil (Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 2 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | Micrologic 3.3 Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB1, NOM-003-SCFI-2000, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UKCA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free |
Product FAQs
7 answersWhat panels are compatible with the LJA36250U31X breaker?
This breaker features an I-Line mounting style and is designed exclusively for installation in Square D I-Line panelboards and I-Line switchboards.
What does the U31X suffix indicate on this catalog number?
The U31X suffix designates that the breaker is equipped with a MicroLogic 3.3 electronic trip unit. This unit provides adjustable long-time and instantaneous (LI) trip functions rather than fixed thermal-magnetic protection.
Can I use this 3-pole L-frame breaker on a single-phase system?
Yes, three-pole PowerPacT L-frame breakers with MicroLogic trip units are marked for single-phase use, but only on 240V AC circuits. You can use any two poles for the single-phase connection.
What wire sizes are accepted by the lugs on the LJA36250U31X?
The mechanical lugs on this breaker will accept one 2 AWG to 500 kcmil aluminum wire, or one 2 AWG to 600 kcmil copper wire per terminal.
How does the LJA36250U31X connect to the power source?
It utilizes an I-Line plug-in connection on the line side to mount directly and securely to the panelboard bus, while the load side uses standard mechanical lugs for wire terminations.
Is the LJA36250U31X rated for 80 percent or 100 percent continuous load?
This specific catalog number carries a standard 80 percent continuous current rating.
Does the U31X trip unit on this breaker include ground fault protection?
No, the MicroLogic 3.3 trip unit only provides long-time and instantaneous (LI) protection. It does not include short-time or equipment ground fault sensing capabilities.
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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