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Square D LJL36250CU33X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Square D
LJL36250CU33X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJL36250CU33X
Quantity
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Square D LJL36250CU33X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Designed for demanding industrial environments, the Square D LJL36250CU33X is a 3-pole, 250A molded case circuit breaker from the PowerPacT L-Frame series. This unit-mount breaker features feed-thru lugs on both the line and load sides, allowing it to install into compatible Square D switchboards, motor control centers, and enclosures. A key advantage of this model is its 100% continuous current rating. It is equipped with a MicroLogic 3.3S electronic trip unit for adjustable LSI protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJL36250CU33X |
| Series | LJL |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 70-250A |
|---|
| Frame Type | LJL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | (1) 2 AWG-500 kcmil (Al) or (1) 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, Padlock Attachment, Motor Operator, Rotary Handle |
|---|---|
| Accessories | MicroLogic 3.3S Trip Unit (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Visual Trip Indicator, 100% Rated |
Product FAQs
6 answersWhat equipment is the LJL36250CU33X designed to be installed in?
This unit-mount breaker is compatible with Square D switchboards, motor control centers, and standalone enclosures. Because it uses a feed-thru lug configuration, it is not compatible with I-Line plug-on panelboards.
What does the C in the LJL36250CU33X catalog number signify?
The C indicates that this breaker is 100 percent rated. It can carry its full 250A continuous current rating without the standard 80 percent derating, provided it is installed in a properly sized enclosure with appropriately rated conductors.
What are the wire size requirements for the standard lugs on this breaker?
The factory-installed line and load lugs accept one 2 AWG to 600 kcmil copper wire, or one 2 AWG to 500 kcmil aluminum wire per phase.
What protective functions does the U33X trip unit provide?
The U33X suffix designates a Micrologic 3.3S electronic trip unit. This provides field-adjustable Long-Time, Short-Time, and Instantaneous (LSI) settings for precise selective coordination in commercial and industrial systems.
Can the LJL36250CU33X replace a standard 80 percent rated breaker?
Yes, a 100 percent rated breaker like the LJL36250CU33X can safely replace an equivalent 80 percent rated 250A L-Frame unit-mount breaker, offering the same or greater continuous current capabilities.
How is the LJL36250CU33X mounted in an enclosure?
This is a feed-thru, unit-mount breaker that secures directly to the backpan or mounting surface using standard hardware. Wire connections are made directly to the provided line and load lugs.
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