Square D LJA36600U31XTB Molded Case Circuit Breaker
- 600A
- 3 Pole
- I-Line
Square D
LJA36600U31XTB
Molded Case Circuit Breaker
Brand
Square D
SKU
LJA36600U31XTB
Quantity
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Square D LJA36600U31XTB - 600A 3 Pole Molded Case Circuit Breaker
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Description
The LJA36600U31XTB is part of the PowerPacT L-Frame family, delivering 600A for industrial applications. It utilizes a Micrologic 3.3 LI trip unit for accurate long-time and instantaneous protection. Featuring an I-Line design, this MCCB installs quickly into Square D I-Line panelboards and switchboards. It includes stud/tapped pad terminals. Rated 65kAIC at 480VAC, this electronic trip breaker ensures superior current-limiting performance and true RMS sensing.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJA36600U31XTB |
| Series | LJA |
| Amperage | 600A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 240-600A |
|---|
| Frame Type | LJA |
|---|---|
| Terminal Type | Stud/Tapped Pad |
| 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 | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module, Motor Operator |
|---|---|
| Accessories | Load Side Lugs Included |
| 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, 80% Rated, Double-Break Rotary Contact Structure, Trip-Free Mechanism |
Product FAQs
6 answersWhat type of panelboards will accept the LJA36600U31XTB circuit breaker?
This breaker features an I-Line plug-in connection and is designed specifically for installation in Square D I-Line panelboards and switchboards. It will not fit in standard bolt-on or load center panels.
How is the LJA36600U31XTB physically mounted into the switchboard?
It utilizes Square D's I-Line mounting system. The line side of the breaker plugs directly onto the vertical bus stack in the panelboard, while the load side uses stud or tapped pad terminals for your outgoing wire connections.
What wire sizes are supported by the load side terminals on this 600A breaker?
The load side connections accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase. The line side connects directly to the I-Line bus and does not require wiring.
What protection settings are provided by the LI electronic trip unit?
The LI designation means the trip unit includes adjustable Long-Time (L) and Instantaneous (I) functions. This allows panel builders to precisely coordinate the breaker's overload and short-circuit response with the rest of the electrical distribution system.
Can the LJA36600U31XTB be used on a 480V system with 50,000 amps of available fault current?
Yes. This breaker carries an interrupting rating of 65kAIC at 480VAC, which safely exceeds a 50kA available fault current requirement at that voltage.
Is the LJA36600U31XTB a direct replacement for older 600A L-frame I-Line breakers?
Yes, this PowerPacT L-frame breaker is the modern replacement for legacy Square D 600A I-Line breakers. You must verify that the 65kAIC at 480V rating and the LI trip functions meet your specific site requirements before installing.
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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