Square D LJP36250CU31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Square D
LJP36250CU31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJP36250CU31X
Quantity
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Square D LJP36250CU31X - 250A 3 Pole Molded Case Circuit Breaker
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250A 3 Pole Molded Case Circuit Breaker
250A 3 Pole Molded Case Circuit Breaker
Description
Designed for maximum distribution efficiency, the Square D LJP36250CU31X is a 250A, 3-pole molded case circuit breaker from the PowerPacT L-Frame series. It provides reliable service for motor control centers and industrial panels. This breaker features a unit-mount design with lug terminals, accepting aluminum or copper wiring. A standout feature is its 100% continuous current rating, paired with a MicroLogic 3.3 trip unit for adjustable long-time and instantaneous (LI) protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJP36250CU31X |
| Series | LJP |
| 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 | LJP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D QED Switchboards, Industrial Control Panels, Motor Control Centers |
| 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 | 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, Lug Kits |
|---|---|
| Accessories | MicroLogic 3.3 Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Visual Trip Indicator, Double-Break Rotary Contact Structure, Trip-Free Mechanism, 100% Rated, RoHS Compliant, Mercury Free |
Product FAQs
7 answersIs the LJP36250CU31X circuit breaker 100% rated?
Yes, the "C" in the catalog number indicates this breaker is rated for 100% continuous duty. This allows the breaker to carry its full 250A capacity continuously without the standard 80% derating requirement, provided it is installed in a properly sized and ventilated enclosure.
What specific trip unit is installed in the LJP36250CU31X?
The "U31X" suffix indicates it is equipped with a Micrologic 3.3 electronic trip unit. This solid-state unit provides highly accurate, adjustable Long-Time and Instantaneous (LI) protection for precise coordination in commercial and industrial systems.
Can the LJP36250CU31X be installed in a Square D I-Line panelboard?
No. The "P" in the LJP prefix means this is a unit-mount (feed-thru) breaker with lugs on both ends. It is designed to be bolted to a backpan in QED switchboards, motor control centers, or industrial control panels. For an I-Line panelboard, you need the LJA36250CU31X plug-on variant.
What are the acceptable wire sizes for the standard lugs on this breaker?
The factory-installed lugs accept a single conductor per phase, ranging from 2 AWG to 600 kcmil for copper (Cu) wire, or 2 AWG to 500 kcmil for aluminum (Al) wire.
What is the difference between the LJP36250CU31X and the LJA36250CU31X?
Both are 250A, 100% rated, J-interrupting L-Frame breakers with Micrologic 3.3 trip units. The difference is the mounting style. The LJP is a unit-mount breaker with lugs on both the line and load sides, while the LJA features an I-Line plug-on connection for the line side.
What does the "J" in the LJP36250CU31X catalog number signify?
The "J" designates the interrupting rating tier for this PowerPacT L-Frame breaker. It indicates a high interrupting capacity of 65kAIC at 480VAC and up to 100kAIC at 240VAC, making it suitable for systems with substantial available fault currents.
Does the LJP36250CU31X provide ground fault protection?
No, the Micrologic 3.3 trip unit only provides Long-Time and Instantaneous (LI) protection. If your application requires equipment ground fault protection, you will need a breaker equipped with a Micrologic 6.3 (LSIG) trip unit.
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