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Square D LDL36250CU31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Square D
LDL36250CU31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LDL36250CU31X
Quantity
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Square D LDL36250CU31X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding loads, the Square D LDL36250CU31X is a 250A, 3-pole PowerPacT L-Frame MCCB. It is 100% rated, allowing it to carry its full capacity continuously without derating. This unit-mount breaker installs into industrial control panels and enclosures. It features lug terminals and serves as a substitute for LGL36250CU31X models. The MicroLogic 3.3 trip unit delivers adjustable Long-Time and Instantaneous (LI) protection with true RMS sensing and an 18 kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | LDL36250CU31X |
| Series | LDL |
| Amperage | 250A |
| 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 | 70-250A |
|---|
| Frame Type | LDL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Industrial Control Panels, Switchboards, Enclosures |
| Wire Gauge | 2 AWG-500 kcmil (Al), 2 AWG-600 kcmil (Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 2 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, Motor Operator, Rotary Handle |
|---|---|
| Accessories | MicroLogic 3.3 Trip Unit |
| 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, 100% Rated, True RMS Sensing, Mercury Free, RoHS Compliant |
Product FAQs
7 answersWhat does the U31X suffix mean in the LDL36250CU31X catalog number?
The U31X designation specifies that the breaker is equipped with a MicroLogic 3.3 electronic trip unit. This provides adjustable Long-Time and Instantaneous protection settings for precise selective coordination.
Is the LDL36250CU31X rated for continuous operation?
Yes, the C in the catalog number indicates this is a 100 percent rated circuit breaker. It can carry its full continuous current rating without the standard 80 percent derating, provided it is installed in an appropriately sized and approved enclosure.
Does this breaker plug into an I-Line panelboard?
No, this is a unit-mount circuit breaker designed for feed-thru applications. It must be bolted directly to a backpan or mounting plate in switchboards or industrial control panels, and is not compatible with I-Line bus connections.
Is the LDL36250CU31X suitable for reverse connection?
Yes, PowerPacT L-Frame circuit breakers with factory-sealed MicroLogic electronic trip units are suitable for reverse feeding. Always verify your specific application requirements and local electrical codes before installation.
Can I add field-installable accessories to this L-Frame breaker?
Yes, the PowerPacT L-Frame supports a variety of field-installable accessories, including shunt trips, undervoltage releases, and auxiliary switches. These are installed in the accessory compartments located under the front cover.
How can I test the electronic trip unit on the LDL36250CU31X?
The MicroLogic trip unit can be tested using a compatible Schneider Electric pocket tester or full-function test kit. This allows you to verify the mechanical operation and electronic trip functions during routine maintenance.
What are the physical dimensions of this PowerPacT L-Frame breaker?
The standard unit-mount L-Frame breaker measures approximately 13.4 inches high, 5.5 inches wide, and 4.3 inches deep. Always consult the manufacturer dimension drawings for exact clearance and wire bending space requirements in your enclosure.
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