Square D LLA36400U31X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D LLA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LLA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LLA36400U31X |
| 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 | Current Limiting, HACR Rated, True RMS Sensing |
Quantity
Square D LLA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| 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 | Current Limiting, HACR Rated, True RMS Sensing |
Description
Built to handle complex commercial loads, this 400A PowerPacT L-Frame breaker incorporates a MicroLogic 3.3 electronic trip unit. This technology provides true RMS sensing and adjustable settings for precise system coordination. The factory-installed I-Line mounting assembly facilitates rapid insertion into Square D I-Line panelboards, effectively replacing older LA36400 thermal-magnetic units. Rated for 100kA at 480VAC, this current-limiting device minimizes let-through energy during faults.Specifications
| Brand | Square D |
|---|---|
| Part Number | LLA36400U31X |
| 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 | Current Limiting, HACR Rated, True RMS Sensing |
Product FAQs
7 answersWhat panelboards are compatible with the LLA36400U31X breaker?
This PowerPacT L-Frame breaker is specifically designed for use in Square D I-Line panelboards and switchboards. It features an I-Line plug-on jaw connection for the line side and mechanical lugs on the load side.
What protection functions are included in the U31X trip unit?
The U31X designation indicates a MicroLogic 3.3 electronic trip unit configured for LI protection. This provides adjustable long-time and instantaneous trip settings, but does not include short-time or ground-fault functions.
Can this 3-pole L-Frame breaker be used in single-phase applications?
Yes, three-pole PowerPacT L-Frame breakers with MicroLogic trip units are marked for single-phase use, but only on 240VAC circuits. You can use any two poles for the connection, per manufacturer documentation.
What are the wire size limits for the load lugs on this 400A breaker?
The standard mechanical lugs on the load side are designed to accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Does the MicroLogic 3.3 trip unit feature True RMS sensing?
Yes, the solid-state MicroLogic 3.3 electronic trip unit utilizes True RMS sensing. This allows the breaker to accurately measure current and provide reliable protection even in electrical systems with heavy harmonic distortion.
Which time-current curves apply to this MicroLogic 3.3 trip unit?
For coordination studies, refer to Schneider Electric trip curve E-31 for the long-time protection function and curve E-33 for the instantaneous function.
How is the trip unit adjusted during commissioning?
The MicroLogic 3.3 trip unit features rotary switches on the front panel to accurately adjust the long-time pickup, long-time delay, and instantaneous pickup settings to match your specific system requirements.
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