Square D JLL36250U31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Quantity
Square D JLL36250U31X - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Part of the PowerPacT J-Frame series, this 250A, 3-pole MCCB features a unit-mount configuration. It is designed for Square D NQ and NF panelboards and QED switchboards. The breaker includes line and load lugs, accepting 3/0 AWG to 350 kcmil wire. It serves as a substitute for the JRL36250U31X and supports reverse-feed applications. A built-in Micrologic 3.2 electronic trip unit provides adjustable LI settings. It delivers a 100 kAIC rating at 480VAC and includes true RMS sensing.Specifications
| Brand | Square D |
|---|---|
| Part Number | JLL36250U31X |
| Series | JLL |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480Y/277VAC, 100kA @ 480VAC, 50kA @ 600Y/347VAC, 50kA @ 600VAC |
| Amperage Range | 62.5-250A |
|---|
| Frame Type | JLL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NQ Panelboards, Square D NF Panelboards, Square D QED Switchboards, Industrial Control Panels, Motor Control Centers |
| Wire Gauge | 3/0 AWG-350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 3/0 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 | Lugs (Line and Load) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Reverse Feed, Visual Trip Indicator, True RMS Sensing |
Product FAQs
8 answersWhat type of trip unit is installed in the JLL36250U31X?
This breaker features a Micrologic 3.2 electronic trip unit. The U31X suffix indicates it provides adjustable Long-Time and Instantaneous (LI) protection functions for precise coordination.
What do the letters in the JLL prefix signify for this breaker?
The first J indicates the PowerPacT J-Frame. The first L indicates the high interrupting rating tier, providing up to 100kAIC at 480VAC. The second L indicates it is a unit-mount breaker with lugs on both the line and load sides.
How does the JLL36250U31X mount in a panel?
This is a unit-mount, feed-thru circuit breaker. It installs using mounting hardware and features lug terminations on both the line and load sides, unlike I-Line plug-in variants.
What wire sizes are accepted by the lugs on the JLL36250U31X?
The factory-installed lugs accept aluminum or copper wire ranging from 3/0 AWG to 350 kcmil. Ensure proper torque specifications are followed during installation.
Is the JLL36250U31X rated for 100 percent continuous current?
No, this circuit breaker has a standard 80 percent continuous current rating.
Which Square D enclosures are compatible with the JLL36250U31X?
This unit-mount J-Frame breaker is designed for use in Square D NQ and NF panelboards, QED switchboards, industrial control panels, and motor control centers.
What is the difference between the JLL36250U31X and the JJA36250U31X?
The JLL36250U31X is a unit-mount breaker with lugs on both the line and load sides. The JJA36250U31X is the I-Line plug-in version designed specifically for Square D I-Line panelboards and switchboards.
Does the JLL36250U31X include a push-to-trip feature?
Yes, PowerPacT J-Frame breakers include an integral push-to-trip button on the cover. This allows you to manually trip the breaker to verify the mechanical operation of the trip mechanism before or after installation.
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