Schneider ElectricLGA36400CU31X
Square D LGA36400CU44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
LGA36400CU44X
Molded Case Circuit Breaker
Brand
Square D
SKU
LGA36400CU44X
Quantity
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Square D LGA36400CU44X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Built to handle complex electrical networks, this 400A PowerPacT L-Frame device features a MicroLogic 6.3A trip unit. It provides fully adjustable LSIG ground fault protection alongside an integrated ammeter for precise monitoring. The breaker mounts into standard Square D I-Line switchboards and panelboards. Load-side lugs are sized for dual 500 kcmil cables. Certified for 100% continuous current, the unit maximizes usable capacity while utilizing true RMS sensing.Specifications
| Brand | Square D |
|---|---|
| Part Number | LGA36400CU44X |
| Series | LGA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Frame Type | L |
|---|---|
| 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 |
| Trip Unit Model | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator, Communication Module |
|---|---|
| Accessories | MicroLogic 6.3A 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 | Current Limiting, HACR Rated, 100% Rated, Mercury Free, PVC Free, Integrated Ammeter |
Product FAQs
8 answersWhat does the C in the LGA36400CU44X catalog number signify?
The C indicates that this circuit breaker is 100% rated. This means it can carry its full 400A continuous current rating without the standard 80% derating, provided it is installed in a properly sized and ventilated enclosure.
What type of trip unit is included with the LGA36400CU44X?
This breaker features a Micrologic 6.3A electronic trip unit. The U44X suffix designates an ammeter-equipped trip unit with LSIG (Long-Time, Short-Time, Instantaneous, and Ground-Fault) protection functions.
What panels are compatible with the LGA36400CU44X breaker?
This breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards.
What wire sizes are accepted by the lugs on the LGA36400CU44X?
The factory-installed lugs accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase. Ensure proper torque is applied during installation as specified on the breaker faceplate.
Does the LGA36400CU44X require a neutral current transformer for ground-fault protection?
If you are installing this LSIG breaker in a 3-phase, 4-wire system, an external neutral current transformer (NCT) is required to accurately monitor ground-fault currents and prevent nuisance tripping.
How do I know what caused the LGA36400CU44X to trip?
The Micrologic 6.3A trip unit features local LED indicators that display the specific cause of the trip, such as an overload, short circuit, or ground fault. This simplifies troubleshooting and reduces downtime.
Can the LGA36400CU44X I-Line breaker be reverse-fed?
No. I-Line plug-in circuit breakers have a dedicated plug-on jaw for the line side bus connection and cannot be reverse-fed.
Can I adjust the trip settings on the LGA36400CU44X?
Yes. The Micrologic 6.3A trip unit allows you to adjust the pickup and delay settings for the Long-Time, Short-Time, Instantaneous, and Ground-Fault (LSIG) protection functions to coordinate with other devices in your electrical system.
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