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Square D LJL36250U31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Square D
LJL36250U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LJL36250U31X
Quantity
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Square D LJL36250U31X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Part of the PowerPacT L-Frame series, this 250-amp electronic trip breaker features a factory-installed MicroLogic 3.3 unit for precise long-time and instantaneous coordination. It installs into Square D switchboards, motor control centers, and industrial enclosures using standard unit mounting. Rated for 65 kAIC at 480VAC, the 80% rated assembly provides true RMS sensing and current-limiting performance for demanding commercial electrical systems.Specifications
| Brand | Square D |
|---|---|
| Part Number | LJL36250U31X |
| 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 | 100-250A |
|---|
| Frame Type | L Frame |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, 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 (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, True RMS Sensing, Visual Trip Indicator, 80% Rated |
Product FAQs
8 answersWhat does the U31X suffix indicate on this Square D breaker?
The U31X suffix specifies that the breaker is equipped with a MicroLogic 3.3 electronic trip unit. This provides adjustable Long-Time and Instantaneous (LI) protection settings, allowing for precise coordination in electrical distribution systems.
How is the LJL36250U31X mounted in a panel or enclosure?
This is a unit-mount circuit breaker, meaning it secures directly to the backpan or mounting plate using screws, rather than plugging onto a busbar or bolting to an I-Line panelboard. It includes line and load lugs for direct wire connections.
Can I install the LJL36250U31X in a Square D I-Line panelboard?
No, the LJL36250U31X is a unit-mount breaker designed for backpan installation in switchboards, motor control centers, or standalone enclosures. For an I-Line panelboard, you would need the I-Line version, catalog number LJA36250U31X.
What settings can be adjusted on the MicroLogic 3.3 trip unit?
The MicroLogic 3.3 (U31X) trip unit provides adjustable Long-Time (Ir) and Instantaneous (Ii) pickup settings. This allows electricians to fine-tune the breaker's overcurrent and short-circuit response to match specific load requirements and coordinate with other protective devices in the system.
Is the LJL36250U31X rated for 80% or 100% continuous current?
This breaker is standard-rated, meaning it is designed to carry 80% of its 250A maximum rating continuously. For continuous loads lasting three hours or more, the load must not exceed 200 amps. If your application requires a 100% rated breaker, you will need the LJL36250CU31X.
Does this breaker come with lugs installed?
Yes, the LJL36250U31X includes factory-installed mechanical lugs on both the line and load sides. It is ready for direct wire termination without requiring additional lug kits.
Can the LJL36250U31X be padlocked in the OFF position for maintenance?
Yes, this PowerPacT L-frame breaker can be equipped with a padlock attachment (such as the S29370) to lock the handle in the OFF position, ensuring safe lockout/tagout (LOTO) procedures during electrical maintenance.
What is the difference between the LJL36250U31X and the LJL36250U33X?
The U31X suffix indicates a MicroLogic 3.3 trip unit, which provides Long-Time and Instantaneous (LI) protection. The U33X suffix indicates a MicroLogic 3.3S trip unit, which adds Short-Time protection (LSI) for more advanced coordination. Ensure you select the correct trip unit for your system's coordination study.
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