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Square D EJB34125 Miniature Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Square D
EJB34125
Miniature Circuit Breaker
Brand
Square D
SKU
EJB34125
Quantity
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Square D EJB34125 - 125A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D EJB34125 - 125A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB34125 |
| Series | EJB |
| Amperage | 125A |
| 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 | 12-2/0 AWG (Al), 14-2/0 AWG (Cu) |
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Standard Aluminum Lugs |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, HACR, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
Quantity
Square D EJB34125 - 125A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB34125-R |
| Series | EJB |
| Amperage | 125A |
| 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 | 12-2/0 AWG (Al), 14-2/0 AWG (Cu) |
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Standard Aluminum Lugs |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, HACR, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
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Description
Providing maximum amperage for the E-Frame series, this 125A miniature circuit breaker delivers reliable thermal-magnetic protection for heavy-duty commercial loads. The three-pole design is optimized for demanding industrial environments. Designed to mount into Square D NF panelboards, the bolt-on connection guarantees stable power delivery under high-stress conditions. It features standard lugs for versatile conductor sizing. With a 65kAIC rating at 480Y/277V, it is fully HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | EJB34125 |
| Series | EJB |
| Amperage | 125A |
| 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 | 12-2/0 AWG (Al), 14-2/0 AWG (Cu) |
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Standard Aluminum Lugs |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, HACR, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat panelboards are compatible with the EJB34125?
This E-frame breaker is designed exclusively for Square D NF series panelboards. It features a bolt-on connection and requires three contiguous pole spaces on the interior bus.
Is the EJB34125 rated for ungrounded 480V delta systems?
No. This breaker has a 480Y/277VAC slash rating. It is strictly approved for use on solidly grounded wye systems where the line-to-ground voltage does not exceed 277VAC. It cannot be safely installed on ungrounded or corner-grounded delta applications.
Can I use the EJB34125 in place of an EDB34125 or EGB34125?
Yes. All three models share the exact same physical E-frame footprint for NF panelboards but feature different interrupting capacities. The EJB34125 provides a 65kAIC rating at 480Y/277VAC, making it a safe, direct upgrade for the 18kAIC EDB34125 or the 35kAIC EGB34125.
What is the lug torque specification for the EJB34125?
The factory aluminum lugs accept 14 to 2/0 AWG copper or 12 to 2/0 AWG aluminum conductors. Required tightening torque is 34.5 lb-in for 14 to 10 AWG wire, and 49.6 lb-in for 8 AWG through 2/0 AWG wire.
How much physical space does the EJB34125 occupy in a panelboard?
It requires three standard pole spaces. Each E-frame pole is approximately 0.98 inches wide, giving this 3-pole breaker an overall width of 2.94 inches.
Does the EJB34125 have adjustable trip settings?
No. It is equipped with a fixed thermal-magnetic trip unit. The long-time overload and instantaneous short-circuit functions are factory sealed and cannot be adjusted in the field.
Does the EJB34125 feature a Visi-Trip indicator?
Yes. It includes the standard Square D red Visi-Trip indicator, which provides immediate visual confirmation when the breaker has tripped due to an overload or short circuit.
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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.
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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.
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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.