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Square D PJA36040U44A Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Square D
PJA36040U44A
Molded Case Circuit Breaker
Brand
Square D
SKU
PJA36040U44A
Quantity
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Square D PJA36040U44A - 400A 3 Pole Molded Case Circuit Breaker
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Description
Built to handle heavy commercial loads, this 400A PowerPacT P-Frame breaker utilizes a sophisticated Micrologic 6.0A trip unit for accurate long-time, short-time, instantaneous, and ground fault sensing. The integrated I-Line mounting jaw allows for rapid, secure placement into compatible Square D distribution panels and switchboards. With a 65kAIC rating at 480VAC, it provides exceptional fault clearing capabilities and true RMS sensing for environments with significant harmonic distortion.Specifications
| Brand | Square D |
|---|---|
| Part Number | PJA36040U44A |
| Series | PJA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | PJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | I-Line Panelboards, Switchboards |
| Wire Gauge | (3) 3/0 AWG-500 kcmil (Al/Cu) |
| Max Wire | 500 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 6.0A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator, Communication Module |
|---|---|
| Accessories | Micrologic 6.0A Trip Unit, Lugs (Load Side) |
| 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, Interchangeable Trip Unit, True RMS Sensing |
Product FAQs
6 answersWhat type of trip unit is included with the PJA36040U44A?
The U44A suffix indicates this breaker is equipped with a Micrologic 6.0 A (Ammeter) electronic trip unit. This provides fully adjustable Long-Time, Short-Time, Instantaneous, and Ground-Fault (LSIG) protection.
What does the PJA frame designation mean?
The PJA designation indicates a Square D PowerPacT P-Frame breaker with a J-level interrupting rating. This specific rating level provides a high interrupting capacity of 100kA at 240VAC and 65kA at 480VAC.
How does this breaker mount into a panelboard?
This breaker features an I-Line style plug-in connection on the line side. The I-Line design allows the breaker to mount directly onto the panelboard bus without the need for separate line-side cables or mounting hardware.
What replacement lug kit is compatible with the load side of this breaker?
The load side of the PJA36040U44A uses the AL800M23K mechanical lug kit. These lugs accept three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Can the trip unit on the PJA36040U44A be changed in the field?
Yes, PowerPacT P-Frame circuit breakers equipped with Micrologic trip units allow for field interchangeability. This provides flexibility to swap or upgrade the trip unit if your system protection requirements change.
Does the PJA36040U44A provide equipment ground-fault protection?
Yes, the included Micrologic 6.0 A trip unit features integral ground-fault protection. This corresponds to the G in its LSIG trip function code, helping protect electrical systems from damaging ground-fault currents.
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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.