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Square D LJP36400U31X Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LJP36400U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJP36400U31X
Quantity
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Square D LJP36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LJP36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LJP36400U31X |
| Series | LJP |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 125-400A |
|---|
| Frame Type | LJP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D QED Switchboards, Industrial Control Panels, Motor Control Centers |
| 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, Motor Operator, Rotary Handle, Lug Kits |
|---|---|
| Accessories | MicroLogic 3.3 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, Visual Trip Indicator, Double-Break Rotary Contact Structure, Trip-Free Mechanism, 80% Rated, RoHS Compliant, Mercury Free |
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Square D LJP36400U31X - 400A 3 Pole Molded Case Circuit Breaker
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Quantity
| Brand | Square D |
|---|---|
| Part Number | LJP36400U31X |
| Series | LJP |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 125-400A |
|---|
| Frame Type | LJP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D QED Switchboards, Industrial Control Panels, Motor Control Centers |
| 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, Motor Operator, Rotary Handle, Lug Kits |
|---|---|
| Accessories | MicroLogic 3.3 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, Visual Trip Indicator, Double-Break Rotary Contact Structure, Trip-Free Mechanism, 80% Rated, RoHS Compliant, Mercury Free |
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Description
The LJP36400U31X is a 400A, 3-pole molded case circuit breaker from Square D's PowerPact L-Frame family. It delivers reliable protection for industrial distribution systems. This unit-mount MCCB integrates into Square D QED switchboards and control panels. It features lug terminations accepting dual 2/0 AWG to 500 kcmil conductors. Equipped with a MicroLogic 3.3 trip unit, it provides adjustable LI protection. It is 80% rated and offers a 65 kAIC interrupting capacity at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJP36400U31X |
| Series | LJP |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 125-400A |
|---|
| Frame Type | LJP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D QED Switchboards, Industrial Control Panels, Motor Control Centers |
| 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, Motor Operator, Rotary Handle, Lug Kits |
|---|---|
| Accessories | MicroLogic 3.3 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, Visual Trip Indicator, Double-Break Rotary Contact Structure, Trip-Free Mechanism, 80% Rated, RoHS Compliant, Mercury Free |
Product FAQs
9 answersWhat does the "J" in the LJP36400U31X catalog number indicate?
In the Square D PowerPacT L-frame series, the "J" designates the interrupting rating tier. This provides a 65kAIC rating at 480VAC and 100kAIC at 240VAC.
What type of trip unit is installed in the LJP36400U31X?
This breaker is equipped with a MicroLogic 3.3 electronic trip unit, indicated by the "U31X" suffix. It provides adjustable Long-time and Instantaneous (LI) trip functions for precise circuit protection.
Can the LJP36400U31X be mounted on a standard DIN rail?
No, the LJP36400U31X is a 400A L-frame breaker designed for unit mounting (feed-thru) in switchboards and control panels. It is too large for standard DIN rail mounting.
What enclosures and panels are compatible with the LJP36400U31X?
This unit-mount breaker is designed for use in Square D QED Switchboards, Industrial Control Panels, and Motor Control Centers. It is not compatible with I-Line panelboards, which require a different mounting configuration.
Is the LJP36400U31X rated for 80% or 100% continuous current?
The standard LJP36400U31X is rated for 80% continuous current.
What is the difference between the LJP36400U31X and the LJL36400U31X?
Both are 400A, 3-pole PowerPacT L-frame breakers with the same MicroLogic 3.3 trip unit and 65kAIC at 480V rating. The difference lies in the termination style; "LJP" and "LJL" indicate different factory lug and busbar configurations for the line and load sides.
Does the LJP36400U31X include ground fault protection?
No, the MicroLogic 3.3 trip unit (LI) provides Long-time and Instantaneous protection only. If ground fault protection is required, a breaker with a MicroLogic 6.3 (LSIG) trip unit is needed.
What is the recommended mounting style for the LJP36400U31X?
This breaker is designed for unit mounting (also known as bolt-on or feed-thru mounting) within a panel or switchboard. It is not designed for plug-in or I-Line busway installations.
Can the trip settings on the LJP36400U31X be adjusted in the field?
Yes, the MicroLogic 3.3 electronic trip unit features adjustable dials for both Long-time and Instantaneous trip settings, allowing licensed electricians to coordinate the breaker with downstream loads.
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