Square D LLA36400CU31X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D LLA36400CU31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for high-demand industrial environments, this 400A PowerPacT L-Frame breaker features a 100-percent continuous current rating. It utilizes a MicroLogic 3.3 trip unit to deliver configurable long-time and instantaneous protection. The specialized I-Line bracket allows fast installation into Square D I-Line panelboards, serving as a modern replacement for legacy LA36400 models. Providing a 100kA interrupting rating at 480VAC, it offers superior current-limiting capabilities.Specifications
| Brand | Square D |
|---|---|
| Series | LLA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LLA |
|---|---|
| Terminal Type | Lugs |
| For Use With | I-Line Panelboards, 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 | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 3.3 Trip Unit, Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 100% Rated, Current Limiting, HACR Rated, True RMS Sensing |
Product FAQs
6 answersWhat does the C in the LLA36400CU31X catalog number indicate?
The C indicates that this breaker is 100% continuous current rated. Unlike standard 80% rated breakers, it can carry its full 400A rating continuously when installed in an enclosure that is listed for 100% operation.
What type of trip unit is included with the LLA36400CU31X?
This breaker features a MicroLogic 3.3 electronic trip unit, indicated by the U31X suffix. It provides adjustable long-time and instantaneous (LI) protection settings for precise coordination.
Which panelboards are compatible with the LLA36400CU31X?
This breaker features an I-Line plug-in mounting bracket and is designed exclusively for use in Square D I-Line panelboards and switchboards. It cannot be used in standard load centers or bolt-on applications.
What wire sizes are accepted by the lugs on this 400A L-Frame breaker?
The factory-installed lugs accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Can the LLA36400CU31X replace older LA or LH series breakers?
Yes, the PowerPacT L-Frame is the modern replacement for legacy Square D LA36400 and LH frame breakers. It fits into the same I-Line panelboard space, though the physical dimensions and trip unit technology differ.
Does this breaker provide ground fault protection?
No. The MicroLogic 3.3 trip unit provides long-time and instantaneous (LI) protection only. If your application requires equipment ground fault protection, you will need a breaker equipped with a MicroLogic 6.3 (LSIG) trip unit.
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