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Square D EJB34090 Miniature Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Square D
EJB34090
Miniature Circuit Breaker
Brand
Square D
SKU
EJB34090
Quantity
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Square D EJB34090 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D EJB34090 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB34090 |
| Series | EJB |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 277VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 65kA @ 277VAC, 65kA @ 480Y/277VAC |
| Frame Type | EJB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NF Panelboards |
| Wire Gauge | 14-2/0 AWG (Cu), 12-2/0 AWG (Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Sold out
Quantity
Square D EJB34090 - 90A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB34090-R |
| Series | EJB |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 277VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 65kA @ 277VAC, 65kA @ 480Y/277VAC |
| Frame Type | EJB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NF Panelboards |
| Wire Gauge | 14-2/0 AWG (Cu), 12-2/0 AWG (Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Providing reliable overcurrent defense, the Square D EJB34090 is a 90A, 3-pole miniature circuit breaker. It is engineered for commercial facilities utilizing 480Y/277VAC networks. This E-Frame breaker features a bolt-on mounting configuration tailored exclusively for Square D NF panelboards. It comes equipped with load-side lugs that accept 14-2/0 AWG copper or aluminum wiring. The unit boasts a 100 kAIC rating at 240V, is HACR rated, and includes a Visi-Trip indicator for fast troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Part Number | EJB34090 |
| Series | EJB |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 277VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 65kA @ 277VAC, 65kA @ 480Y/277VAC |
| Frame Type | EJB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NF Panelboards |
| Wire Gauge | 14-2/0 AWG (Cu), 12-2/0 AWG (Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersCan the EJB34090 be used on a 480V ungrounded delta system?
No. This breaker is rated for 480Y/277VAC, meaning it must be installed on a solidly grounded wye system where the line-to-ground voltage does not exceed 277V. It is not rated for use on 480V delta systems.
What is the difference between Square D EDB, EGB, and EJB circuit breakers?
These breakers share the same physical footprint and mount in NF panelboards, but they have different interrupting ratings. At 480Y/277VAC, EDB breakers provide up to 18kAIC, EGB breakers provide 35kAIC, and EJB breakers provide 65kAIC.
Can the EJB34090 be backfed?
Yes. Standard Square D E-frame breakers, including the EJB34090, do not have Line and Load markings and can be safely reverse-fed. Note that this does not apply to EPD (Equipment Protection Device) variants, which are distinctly marked and cannot be backfed.
Is the EJB34090 HACR rated?
Yes. Square D E-frame molded case circuit breakers carry an HACR rating, making them suitable for group motor applications in heating, air conditioning, and refrigeration equipment.
Can I install the EJB34090 in a Square D NQ or I-Line panelboard?
No. The EJB34090 is an E-frame breaker designed exclusively for Square D NF panelboards. It uses a specific bolt-on configuration that will not fit in NQ panelboards (which accept QO or QOB breakers) or I-Line distribution panels.
What is the recommended tightening torque for the load lugs on this breaker?
Torque specifications vary by wire size. For 14 to 10 AWG wire, the standard torque is 34.5 lb-in. For 8 to 2/0 AWG wire, the standard torque is 49.6 lb-in. Always verify against the manufacturer label printed on the side of the breaker.
Does this breaker mount onto a standard DIN rail?
No. While often classified as a miniature circuit breaker, the EJB34090 does not use a DIN rail mounting system. It requires a bolt-on connection directly to the busbar of a compatible NF panelboard.
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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.
Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 12 reviews.
Total 5 star reviews: 11 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
12 reviews
- EOEric O.Verified BuyerReviewingSquare D EJB14040 - 40A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Breaker Replacement
I needed a replacement breaker fast, and SuperBreakers pulled it off for me without any issues.
- BBBrad B.Verified BuyerReviewingSquare D EJB34125 - 125A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/27/26Breaker Order
Thanks! Ordering was easy and the part was delivered quickly and accurately. All I can ask for!
- RRRodolfo R.Verified BuyerReviewingSquare D EJB34015 - 15A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/14/26Satisfied Customer
The breaker was received in good condition and it works good. Lead time was not long it all.
Very happy with SuperBreakers Rep. Good customer service.
- RNRandy N.Verified BuyerReviewingSquare D EJB34070 - 70A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars11/14/25Breaker value
saved a lot compared to what the electrician wanted to charge us, at least half the price.
- TWTimothy W.Verified BuyerReviewingSquare D EJB34020 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/15/25Circuit Breaker
Product arrived in a timely matter and met expectations to repair the problem that we had.