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Square D LDL36250U33X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Square D
LDL36250U33X
Molded Case Circuit Breaker
Brand
Square D
SKU
LDL36250U33X
Quantity
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Square D LDL36250U33X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Designed for precise coordination, the Square D LDL36250U33X is a 250A, 3-pole PowerPacT L-Frame MCCB. It provides reliable protection for commercial and industrial systems. This 80% rated breaker features a unit-mount design for control panels and enclosures. It includes line and load lugs and replaces LGL36250U33X models. The MicroLogic 3.3S trip unit offers adjustable Long-Time, Short-Time, and Instantaneous (LSI) functions, true RMS sensing, and an 18 kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | LDL36250U33X |
| 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 | 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
8 answersAre line and load lugs included with the LDL36250U33X?
Yes, this feed-thru circuit breaker comes standard with factory-installed lugs on both the line and load sides, ready for wire termination.
What does the U33X suffix indicate on this Square D circuit breaker?
The U33X suffix designates that the breaker is equipped with a MicroLogic 3.3S electronic trip unit. This solid-state trip unit provides adjustable Long-Time, Short-Time, and Instantaneous (LSI) protection settings for precise system coordination.
Can I install the LDL36250U33X in an I-Line panelboard?
No, the LDL36250U33X is a unit-mount circuit breaker designed for individual mounting in industrial control panels, switchboards, or enclosures. For I-Line panelboard installations, you need the plug-in variant, catalog number LDA36250U33X.
What is the difference between the LDL36250U33X and the LGL36250U33X?
Both are 250A, 3-pole PowerPacT L-Frame unit-mount breakers with MicroLogic 3.3S trip units. The difference is the interrupting rating: the LDL frame is rated at 18 kAIC at 480VAC, while the LGL frame has a higher interrupting capacity of 35 kAIC at 480VAC.
What interrupting rating tier does the D in LDL36250U33X represent?
In the PowerPacT L-Frame series, the second letter D designates the standard interrupting tier. This provides 18 kAIC at 480VAC and 25 kAIC at 240VAC. For higher fault current applications, you would need a G, J, L, or R tier breaker.
Does the LDL36250U33X provide ground fault protection?
No, the MicroLogic 3.3S trip unit provides Long-Time, Short-Time, and Instantaneous (LSI) protection, but it does not include Equipment Ground-Fault protection. If ground fault protection is required, you will need a breaker with a MicroLogic 6.3 trip unit (LSIG).
Is the LDL36250U33X rated for 80 percent or 100 percent continuous current?
The LDL36250U33X is a standard 80 percent rated circuit breaker. This means the continuous load should not exceed 200 Amps (80 percent of its 250A rating) for periods longer than three hours, in accordance with standard National Electrical Code (NEC) requirements.
Is the LDL36250U33X HACR rated?
Yes, this circuit breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.
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