Schneider ElectricLGA36400U43X
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Free Shipping Over $99
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Square D LGA36400U33X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
LGA36400U33X
Molded Case Circuit Breaker
Brand
Square D
SKU
LGA36400U33X
Quantity
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Square D LGA36400U33X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LGA36400U33X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LGA36400U33X |
| Series | LGA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| 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 | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.3S |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 3.3S Trip Unit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free, Double-Break Rotary Contact Structure, 80% Rated |
Quantity
Square D LGA36400U33X - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | LGA36400U33X-R |
| Series | LGA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| 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 | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.3S |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 3.3S Trip Unit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free, Double-Break Rotary Contact Structure, 80% Rated |
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Description
Designed for advanced coordination, the LGA36400U33X is a 3-pole, 400A molded case circuit breaker from the Square D PowerPacT L-Frame lineup. This breaker features an I-Line plug-on configuration, allowing it to install into Square D I-Line switchboards and panelboards. It is equipped with a MicroLogic 3.3S electronic trip unit, providing adjustable LSI functions. The unit is rated for 35kA at 480VAC and offers true RMS sensing.Specifications
| Brand | Square D |
|---|---|
| Part Number | LGA36400U33X |
| Series | LGA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| 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 | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.3S |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 3.3S Trip Unit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Mercury Free, PVC Free, Double-Break Rotary Contact Structure, 80% Rated |
Product FAQs
7 answersWhat type of panelboards are compatible with the LGA36400U33X?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It features a specialized plug-on design for the line side phase connections that mounts directly to the I-Line bus.
What does the U33X suffix indicate on this PowerPacT breaker?
The U33X designation indicates that the breaker is equipped with a Micrologic 3.3S electronic trip unit. This provides adjustable LSI (Long-time, Short-time, and Instantaneous) protection settings for precise electrical coordination.
How do the LSI trip functions benefit panel builders?
The adjustable Long-time, Short-time, and Instantaneous settings allow electricians to fine-tune the breaker's trip curve. This ensures proper selective coordination with downstream breakers, helping to isolate faults and prevent nuisance tripping of the main system.
What are the acceptable wire sizes for the load lugs on this 400A breaker?
The factory-installed load lugs accept two conductors per phase, accommodating wire sizes ranging from 2/0 AWG to 500 kcmil in either aluminum or copper.
How does the I-Line mounting system work for this L-frame breaker?
The I-Line system uses a plug-on connection for the line side that snaps directly onto the panelboard bus assembly. A mounting bracket secures the breaker in place, while the load side utilizes standard mechanical lugs for wire termination.
Can this breaker replace older Square D L-frame models?
Yes, the PowerPacT LGA series serves as a direct replacement for legacy Square D L-frame breakers with matching amperage and interrupting ratings, maintaining full compatibility with existing I-Line bus structures.
Does the Micrologic 3.3S trip unit require external power to operate?
No, the Micrologic 3.3S trip unit is self-powered by the current flowing through the breaker. It does not require a separate control power source to perform its basic overcurrent protection functions.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- GGGregory G.Verified BuyerReviewingSquare D LGA36400U31X - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/29/26great
perfect
- PHPaul H.Verified BuyerReviewingSquare D LGA36400U31X - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26Prompt Delivery
We needed this breaker promptly for a scheduled outage of an entire building electrical service and Superbreakers delivered.
- GMGreg M.Verified BuyerReviewingSquare D LGA36400U31X - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/24/26Received in a timely manner.
The breaker was as advertised.