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Square D LDL36400U33X Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LDL36400U33X
Molded Case Circuit Breaker
Brand
Square D
SKU
LDL36400U33X
Quantity
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Square D LDL36400U33X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial applications, the Square D LDL36400U33X is a 400A, 3-pole MCCB from the PowerPacT L-Frame family. It delivers robust protection for complex distribution networks. This unit-mount breaker installs into industrial control panels, switchboards, and enclosures. It accepts 2/0 AWG to 500 kcmil wire via standard lug terminals. The MicroLogic 3.3S electronic trip unit provides adjustable LSI protection, true RMS sensing, and an 18 kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | LDL36400U33X |
| Series | LDL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 20kA @ 250VDC |
| Amperage Range | 125-400A |
|---|
| Frame Type | LDL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Industrial Control Panels, Switchboards, Enclosures |
| 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 | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Rotary Handle, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, True RMS Sensing, 80% Rated |
Product FAQs
7 answersWhat does the U33X suffix mean in the LDL36400U33X catalog number?
The U33X suffix indicates the breaker is equipped with a Micrologic 3.3S electronic trip unit. This solid-state module provides field-adjustable Long-Time, Short-Time, and Instantaneous (LSI) protection settings, allowing for precise selective coordination in complex distribution networks.
What does the D in the LDL36400U33X catalog number represent?
The second letter in the catalog number indicates the interrupting rating tier. The D specifies an 18 kAIC rating at 480VAC. If your system requires a higher fault current rating, you would need to source a G, J, or L interrupting tier within the PowerPacT L-Frame family.
Will the LDL36400U33X fit into a Square D I-Line panelboard?
No. The LDL36400U33X is a unit-mount breaker with feed-thru lugs. It is not compatible with I-Line bus systems. For I-Line panelboards, you would need the I-Line version of this breaker, which typically starts with LDA instead of LDL.
How is the Square D LDL36400U33X mounted?
This breaker features a unit-mount configuration with mechanical lugs on both the line and load sides. It is designed to be bolted directly to the backpan of industrial control panels, enclosures, or switchboards, rather than plugging into a busway.
What size wire do the standard lugs on the LDL36400U33X accept?
The factory-installed mechanical lugs on this 400A breaker accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase. Ensure proper torque specifications are followed during installation as outlined by Schneider Electric.
Is the LDL36400U33X rated for 100 percent continuous current?
No, this specific catalog number is standard-rated, meaning it is designed to carry 80 percent of its 400A maximum capacity continuously. If your application requires a 100 percent continuous current rating, you will need a variant with the C suffix in the catalog number.
Can I install field accessories like shunt trips in the LDL36400U33X?
Yes, the PowerPacT L-Frame series supports a wide range of field-installable internal accessories, including shunt trips, undervoltage releases, and auxiliary contacts. These accessories share common footprints across the PowerPacT family for simplified integration into your control scheme.
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