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Schneider Electric JJA36250U44X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Schneider Electric
JJA36250U44X
Molded Case Circuit Breaker
Brand
Schneider Electric
SKU
JJA36250U44X
Quantity
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Schneider Electric JJA36250U44X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Part of the PowerPacT J-Frame series, this 250-amp electronic trip breaker delivers advanced LSIG protection via its integrated Micrologic 6.2 A ammeter trip unit. It installs into Square D I-Line panelboards and switchboards for commercial and industrial power distribution. Serving as a modern upgrade, it replaces legacy KC36250 thermal-magnetic units while offering true RMS sensing and a 65kAIC rating at 480VAC for superior system coordination.Specifications
| Brand | Schneider Electric |
|---|---|
| Part Number | JJA36250U44X |
| Series | JJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 100-250A |
|---|
| Terminal Type | Lugs |
|---|---|
| For Use With | 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 | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 6.2A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator, Communication Module |
|---|---|
| Accessories | Micrologic 6.2 A Trip Unit (Ammeter) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Visual Trip Indicator, True RMS Sensing, Ground Fault Protection |
Product FAQs
7 answersWhat type of panels is the JJA36250U44X compatible with?
This breaker is designed for use in Square D I-Line panelboards and switchboards. It features a plug-on connection for the line side and mechanical lugs for the load side.
What does the U44X suffix in the catalog number indicate?
The U44X suffix signifies that the breaker is equipped with a Micrologic 6.2 A electronic trip unit. This provides Long-Time, Short-Time, Instantaneous, and Ground Fault (LSIG) protection, along with an integrated ammeter.
Do I need a neutral current transformer when using this breaker on a 3-phase, 4-wire system?
Yes. Because this breaker includes ground fault protection, an external neutral current transformer is required when installed on a 3-phase, 4-wire system to accurately sense ground fault currents.
Can the JJA36250U44X be reverse fed?
No. I-Line circuit breakers feature a specific plug-on jaw design for the line side bus and are not suitable for reverse feeding applications.
Are the trip settings adjustable on the Micrologic 6.2 A unit?
Yes, the electronic trip unit allows you to adjust the pickup and delay settings for long-time, short-time, and ground fault protection, as well as the instantaneous pickup, ensuring precise coordination with your electrical system.
Can this breaker replace older thermal-magnetic units?
Yes, the JJA36250U44X can serve as a modern upgrade for legacy Square D 250A I-Line breakers, such as the KC36250, offering advanced electronic trip functions and true RMS sensing.
What wire sizes are accepted by the load side lugs?
The factory-installed mechanical lugs on the load side accept aluminum or copper conductors ranging from 3/0 AWG to 350 kcmil. The line side utilizes an I-Line plug-on connection.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 4 reviews.
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Rating
4 reviews
- CPCody P.Verified BuyerReviewingSquare D JJA36175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars8/27/26Fast Delivery
Breaker came perfectly packaged and well ahead of estimated date
- BWBrian W.Verified BuyerReviewingSquare D JJA36250 - 250A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/27/26Great
Quick delivery
- JEJoshua E.Verified BuyerReviewingSquare D JJA36175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/16/26Great product
The product fit perfect into my main distribution panel.
- JGJohn G.Verified BuyerReviewingSquare D JJA36225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/23/25Top service
Super breakers has always been great with good stock and quick ship