Square D JLA36250U31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Quantity
Square D JLA36250U31X - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
The JLA36250U31X is a 250A, 3-pole MCCB from Square D's PowerPacT J-Frame series. It mounts into standard I-Line panelboards and switchboards. This breaker replaces legacy KC36250 K-Frame units. It features an I-Line connection and includes AL250JD load lugs for 3/0 AWG to 350 kcmil wire. Equipped with a Micrologic 3.2 electronic trip unit, it provides adjustable LI settings. It delivers a 100 kAIC rating at 480VAC and true RMS sensing.Specifications
| Brand | Square D |
|---|---|
| Part Number | JLA36250U31X |
| Series | JLA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 70-250A |
|---|
| Frame Type | J |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, I-Line Switchboards |
| 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, Communication Module |
|---|---|
| Accessories | Load Side Lugs (AL250JD) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, Visual Trip Indicator, Reverse Feed, Mercury Free, PVC Free, True RMS Sensing |
Product FAQs
9 answersWhat panels are compatible with the JLA36250U31X?
This plug-in breaker is designed exclusively for Square D I-Line panelboards and switchboards. It mounts directly onto the bus stack and is not compatible with standard load centers, NQB panels, or unit-mount applications.
How much mounting space does this J-frame breaker require on an I-Line bus?
As a three-pole J-frame circuit breaker, it occupies 4.5 inches of vertical mounting space on the I-Line bus stack, requiring 1.5 inches per pole.
What does the U31X signify in the catalog number?
In the Square D PowerPacT nomenclature, U31X indicates the inclusion of a standard Micrologic 3.2 electronic trip unit. This specific module provides adjustable Long-Time and Instantaneous (LI) protection without advanced communication features.
What wire sizes and materials are accepted by the standard lugs?
The factory-installed mechanical lugs safely accept either aluminum or copper conductors ranging from 3/0 AWG to 350 kcmil. Proper torque is required per the manufacturer label to ensure a secure, code-compliant connection.
What is the standard replacement lug kit for the JLA36250U31X?
If the original terminals are damaged or lost, the correct factory replacement mechanical lug kit is part number AL250JD, which is the standard set for 250A PowerPacT J-frame breakers.
Can the JLA36250U31X be applied at 100 percent of its continuous current rating?
No. Like most standard molded case circuit breakers, it is rated for 80 percent continuous use per the National Electrical Code. Continuous loads must not exceed 200 amps (80 percent of its 250A rating) for periods of three hours or longer.
How is this breaker mechanically secured into the panelboard?
Installers use a flat-blade screwdriver in the mounting bracket notch to lever and fully seat the plug-in jaws onto the I-Line bus. Once seated, it is firmly secured using the built-in captive retaining screw fastened directly to the panelboard backpan.
Can this circuit breaker be used in direct current (DC) applications?
No. Because it is equipped with a Micrologic solid-state electronic trip unit, it is rated strictly for alternating current (AC) systems up to 600VAC. It cannot be used to protect DC circuits.
Does the Micrologic 3.2 trip unit feature local energy metering?
No. The standard Micrologic 3.2 trip unit provides robust electronic overcurrent protection but does not include the integrated ammeter, LCD display, or energy monitoring capabilities found on the advanced A or E series MicroLogic units.
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