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Square D LDA36400U31X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
LDA36400U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LDA36400U31X
Quantity
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Square D LDA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LDA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LDA36400U31X |
| Series | LDA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 2 x 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 | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, True RMS Sensing, RoHS Compliant, Mercury Free |
Quantity
Square D LDA36400U31X - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LDA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 2 x 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 | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, True RMS Sensing, RoHS Compliant, Mercury Free |
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Description
Part of the PowerPacT L-Frame series, this 400A molded case circuit breaker delivers robust power distribution for commercial facilities. The 3-pole unit handles loads up to 600VAC. Designed for seamless integration, the breaker mounts into Square D I-Line panelboards and switchboards. The plug-on connection simplifies installation. It features a MicroLogic 3.3 electronic trip unit with adjustable long-time and instantaneous (LI) functions.Specifications
| Brand | Square D |
|---|---|
| Part Number | LDA36400U31X |
| Series | LDA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 2 x 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 | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, True RMS Sensing, RoHS Compliant, Mercury Free |
Product FAQs
5 answersHow are the line and load connections configured on the LDA36400U31X?
This L-frame breaker features a plug-in I-Line connection on the line side that snaps directly onto the panelboard bus. The load side utilizes mechanical lugs that accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
What does the U31X suffix indicate on this circuit breaker?
The U31X suffix designates that the breaker is equipped with a standard MicroLogic 3.3 electronic trip unit. This solid-state unit provides adjustable long-time and instantaneous (LI) trip functions, offering more precise coordination than standard thermal-magnetic breakers.
What is the continuous current rating for the LDA36400U31X?
This model is standard rated at 80 percent continuous current. For continuous loads lasting three hours or more, the applied load must not exceed 320 amps, which is 80 percent of its 400-amp nominal rating.
Can the LDA36400U31X be used on single-phase electrical systems?
Yes, but only on 240VAC circuits. Square D allows PowerPacT L-frame breakers equipped with MicroLogic trip units to be used for single-phase applications exclusively at 240VAC maximum. When applying it to a single-phase system, you may use any two poles.
What type of panelboards will accept this breaker?
The LDA36400U31X is designed specifically for Square D I-Line panelboards and I-Line switchboards. It features a plug-in base that mounts directly to the specialized I-Line bus structure and cannot be installed in standard unit-mount or load center enclosures.
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