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Square D PJA36120U31A Molded Case Circuit Breaker
- 1200A
- 3 Pole
- I-Line
Square D
PJA36120U31A
Molded Case Circuit Breaker
Brand
Square D
SKU
PJA36120U31A
Quantity
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Square D PJA36120U31A - 1200A 3 Pole Molded Case Circuit Breaker
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Square D PJA36120U31A - 1200A 3 Pole Molded Case Circuit Breaker
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| Brand | Square D |
|---|---|
| Part Number | PJA36120U31A |
| Series | PJA |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 480-1200A |
|---|
| Frame Type | PJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (4) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.0 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Load Side Lugs Included, MicroLogic 3.0 Trip Unit (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, 80% Rated, True RMS Sensing |
Quantity
Square D PJA36120U31A - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | PJA |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 480-1200A |
|---|
| Frame Type | PJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (4) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.0 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Load Side Lugs Included, MicroLogic 3.0 Trip Unit (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, 80% Rated, True RMS Sensing |
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Description
Featuring advanced microprocessor-based sensing, the Square D PJA36120U31A is a 1200A, 3-pole MCCB from the PowerPacT P-Frame series. It comes equipped with a MicroLogic 3.0 LI trip unit, allowing for precise adjustability of long-time and instantaneous protection settings. Designed for commercial power systems, it mounts into Square D I-Line panelboards and switchboards. This model serves as a replacement for legacy MA36120 and MH36120 breakers. It boasts a 65 kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Series | PJA |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 480-1200A |
|---|
| Frame Type | PJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | (4) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.0 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Load Side Lugs Included, MicroLogic 3.0 Trip Unit (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, 80% Rated, True RMS Sensing |
Product FAQs
7 answersWhich legacy Square D breakers can the PJA36120U31A replace?
This PowerPacT P-Frame breaker serves as a direct modern replacement for legacy Square D MA36120 and MH36120 1200A molded case circuit breakers.
What does the "U31A" suffix mean in the PJA36120U31A part number?
The "U31A" designates a MicroLogic 3.0 electronic trip unit. This specific trip unit provides adjustable Long-Time and Instantaneous (LI) protection settings.
What interrupting capacity does the "J" in the PJA frame indicate?
The "J" specifies the interrupting rating tier for this PowerPacT breaker. It delivers 100kA at 240VAC, 65kA at 480VAC, and 25kA at 600VAC.
Is the PJA36120U31A compatible with standard NQ or NF panelboards?
No. This breaker features an I-Line plug-on connection and is designed exclusively for use in Square D I-Line panelboards and switchboards.
How is the PJA36120U31A secured inside an I-Line panelboard?
The breaker utilizes the Square D I-Line mounting system, which features plug-on line-side jaws that connect directly to the busbars and a bolted bracket to secure the breaker to the panelboard backpan.
What are the load-side wiring requirements for the PJA36120U31A?
The breaker is equipped with mechanical load lugs that accept four conductors per phase. The lugs are rated for aluminum or copper wire sizes from 3/0 AWG to 500 kcmil.
Does the PJA36120U31A provide equipment ground fault protection?
No. The included MicroLogic 3.0 trip unit only features Long-Time and Instantaneous (LI) protection. It does not include the ground fault (G) function required for LSIG protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- TGTroy G.Verified BuyerReviewingSquare D PJA36120U44A - 1200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/21/25Help with flood conditions
The whole process with Technitrol was Awesome. Jim the owner was extremely helpful he caught some problems with one of the breakers that I didn't notice very helpful. James and Collin were great also. The whole company really step up helping me determine what path I should take to replace/refurbish breakers that went through a flood. I never experienced a flood like this they were an awesome resource and help to me and my employer the City of Wauwatosa
- RNRoss N.ReviewingSquare D PJA36080CU31A - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/12/22Stock!
Superbreakers has gotten my company out of a few binds recently. When stock is unavailable at my local supplier I've been turning to Superbreakers to save the day. Great customer service and timely shipments.