Square D JJA34250WU31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Square D
JJA34250WU31X
Molded Case Circuit Breaker
Brand
Square D
SKU
JJA34250WU31X
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D JJA34250WU31X - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
250A 3 Pole Molded Case Circuit Breaker
Schneider ElectricJJA36250U43X
3 Pole Circuit Breaker
Schneider ElectricJJA36250U44X
250A 3 Pole Molded Case Circuit Breaker
Description
Delivering advanced protection for demanding environments, this 3-pole, 250A electronic trip MCCB is part of the Square D PowerPacT J-Frame series. It supports mission-critical commercial facilities. Featuring an I-Line plug-on mounting style, it easily installs into Square D I-Line panelboards and switchboards. This design minimizes downtime during installation. Rated 65kAIC at 480V, it is equipped with a Micrologic 3.2-W trip unit offering adjustable LI functions.Specifications
| Brand | Square D |
|---|---|
| Series | JJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards, Square D 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, Motor Operator |
|---|---|
| Accessories | Micrologic 3.2 Trip Unit |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, IEC, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Visual Trip Indicator, Mercury Free, PVC Free, Mission Critical |
Product FAQs
6 answersCan I install the JJA34250WU31X in a standard Square D NQ or NF panelboard?
No, this breaker features an I-Line style plug-in connection. It is exclusively compatible with Square D I-Line Panelboards and I-Line Switchboards.
What does the U31X suffix mean on this PowerPacT breaker?
The U31X suffix indicates the breaker is equipped with a Micrologic 3.2 electronic trip unit. This solid-state trip unit provides adjustable Long-Time and Instantaneous (LI) protection functions.
What does the W signify in the JJA34250WU31X catalog number?
The W designates a Micrologic 3.2-W Mission Critical trip unit. This specialized electronic trip unit is engineered to deliver advanced selective coordination and reliable protection in demanding commercial or industrial facilities.
Are the lugs on the JJA34250WU31X rated for aluminum wire?
Yes, the factory-installed lugs are dual-rated for both aluminum and copper (Al/Cu) conductors. They accept wire gauges ranging from 3/0 AWG to 350 kcmil.
Can this 3-pole Micrologic breaker be used in a single-phase application?
Yes, but with limitations. Square D PowerPacT J-frame breakers equipped with standard Micrologic trip units (such as the U31X) are marked for single-phase use on 240VAC circuits only, utilizing any two poles.
Is the trip curve on the JJA34250WU31X adjustable?
Yes. Because it utilizes a solid-state electronic trip unit rather than a fixed thermal-magnetic mechanism, licensed electricians can adjust the Long-Time and Instantaneous (LI) trip settings to coordinate with specific load requirements.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.