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Square D LJL36400CU31X Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LJL36400CU31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJL36400CU31X
Quantity
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Square D LJL36400CU31X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Designed to handle continuous loads, this 400-amp electronic trip MCCB is part of the Square D PowerPacT L-Frame series. It installs into compatible motor control centers and industrial enclosures via standard unit mounting. Equipped with a MicroLogic 3.3 trip unit, the 100% rated breaker offers adjustable long-time and instantaneous settings, true RMS sensing, and a 65 kAIC rating at 480VAC to ensure optimal coordination and safety in commercial facilities.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJL36400CU31X |
| Series | LJL |
| 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 | LJL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| 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 |
|---|---|
| Accessories | MicroLogic 3.3 Trip Unit (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Visual Trip Indicator, 100% Rated, RoHS Compliant |
Product FAQs
7 answersWhat does the C in the LJL36400CU31X catalog number indicate?
The C indicates that this breaker is 100 percent rated. Unlike standard 80 percent rated breakers, it can carry its full 400A continuous current rating indefinitely when installed in a properly sized and ventilated enclosure with 90 degree Celsius rated wire.
What protection functions does the U31X suffix provide on this breaker?
The U31X suffix designates a MicroLogic 3.3 electronic trip unit. This provides adjustable Long-Time (L) and Instantaneous (I) protection settings, allowing for precise coordination in commercial and industrial electrical systems.
What type of wire and lugs are compatible with the LJL36400CU31X?
This unit mount breaker comes standard with mechanical lugs on both the line and load sides. The lugs accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Can I mount the LJL36400CU31X in an I-Line panelboard?
No. The L in the third position of the catalog number indicates this is a unit mount breaker designed for feed-thru installation in enclosures, switchboards, or motor control centers. For an I-Line plug-on connection, you would need an LJA frame breaker such as the LJA36400CU31X.
Does this breaker include a Visi-Trip indicator?
Yes, PowerPacT L-frame breakers feature the Visi-Trip LED locator. This provides a visual light alert when the breaker has tripped, helping operators quickly identify the tripped device and begin the troubleshooting process.
How does the LJL36400CU31X differ from the LGL36400CU31X?
The difference is the interrupting rating. The LJL has a J interrupting rating of 65kA at 480V and 25kA at 600V, while the LGL has a G interrupting rating of 35kA at 480V and 18kA at 600V. The LJL is required for systems with higher available fault currents.
Can I change the trip unit on the LJL36400CU31X in the field?
No. Because this specific catalog number lacks a T or R suffix after the amperage rating, it is a factory-sealed breaker. The MicroLogic 3.3 trip unit cannot be removed or interchanged in the field.
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