Square D LJA36400U54X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
LJA36400U54X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJA36400U54X
Quantity
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Square D LJA36400U54X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for robust power distribution, the Square D LJA36400U54X is a 3-pole, 400A MCCB from the PowerPacT L-Frame family. It installs into Square D I-Line panelboards and switchboards, utilizing a plug-on design for secure, efficient connections. The integrated MicroLogic 6.3E electronic trip unit provides adjustable Long-Time, Short-Time, Instantaneous, and Ground Fault (LSIG) settings, plus energy metering for superior system coordination.Specifications
| Brand | Square D |
|---|---|
| Series | LJA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LJA |
|---|---|
| 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 | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | Micrologic 6.3E 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, Phase Loss Protection, Mercury Free, PVC Free |
Product FAQs
7 answersWhat type of panelboard is the LJA36400U54X designed to fit?
This breaker features an I-Line style plug-in connection on the line side, making it compatible with Square D I-Line panelboards and switchboards.
What does the U54X suffix indicate on this L-Frame breaker?
The U54X suffix indicates the breaker is equipped with a MicroLogic 6.3E (Energy) electronic trip unit, which provides adjustable Long-Time, Short-Time, Instantaneous, and Ground-Fault (LSIG) protection, along with energy metering capabilities.
How does the LJA36400U54X mount into the enclosure?
It uses an I-Line plug-on connection for the line side to attach directly to the panelboard bus, and mechanical lugs on the load side for wire connections.
Can the LJA36400U54X replace older LA or LH frame circuit breakers?
Yes, PowerPacT L-Frame breakers are the modern replacements for legacy LA and LH frame breakers. They are designed to fit into the same I-Line panelboard space while utilizing newer electronic trip technology.
What wire sizes are accepted by the load-side lugs on this 400A breaker?
The standard mechanical lugs accept two conductors per phase, ranging from 2/0 AWG to 500 kcmil for either aluminum or copper wire (Al/Cu).
Is the trip unit on the LJA36400U54X adjustable?
Yes, the MicroLogic 6.3E electronic trip unit allows for full adjustability of the LSIG (Long-Time, Short-Time, Instantaneous, and Ground-Fault) trip settings to coordinate with your specific system requirements.
Does this breaker provide ground-fault protection?
Yes, the G in the LSIG trip function indicates that this breaker includes adjustable ground-fault protection for equipment, which is configured via the MicroLogic 6.3E trip unit.
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