Square D EJB34125SA Miniature Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Quantity
Square D EJB34125SA - 125A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Featuring a factory-installed shunt trip mechanism, this 125A three-pole component enables remote tripping capabilities for advanced control schemes. The unit fastens securely into Square D NF lighting and distribution panelboards via standard bolt-on terminals. Delivering 65kA interrupting capacity at 480Y/277V, it combines robust thermal-magnetic protection with a Visi-Trip flag to simplify maintenance and troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Part Number | EJB34125SA |
| 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 | 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 | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Aluminum Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat panelboards are compatible with the Square D EJB34125SA?
This bolt-on circuit breaker is designed exclusively for use in Square D NF series panelboards. It is not compatible with NQ panelboards, which require QO or QOB breakers, or I-Line panelboards.
What does the "SA" suffix mean on the EJB34125SA catalog number?
The "SA" suffix indicates that the breaker includes a factory-installed shunt trip with a 120VAC control voltage. This allows the breaker to be tripped remotely for emergency shutdowns or automated control systems.
Can I field-install a shunt trip on a standard EJB34125 breaker?
No, shunt trips for Square D E-frame breakers are not field-installable. If your application requires remote tripping, you must purchase a breaker with a factory-installed shunt trip, such as the EJB34125SA.
What is the difference between the Square D EDB34125SA, EGB34125SA, and EJB34125SA?
These breakers share the same physical footprint and compatibility with NF panelboards, but they have different interrupting ratings at 480Y/277VAC. The EDB is rated for 18kAIC, the EGB for 35kAIC, and the EJB is the highest tier, rated for 65kAIC.
What does the "LI" trip function code mean for this breaker?
The "LI" designation means the thermal-magnetic trip unit provides Long-Time (overload) and Instantaneous (short-circuit) protection. Both of these trip settings are fixed and cannot be adjusted in the field.
Is the EJB34125SA suitable for HVAC applications?
Yes, Square D E-frame breakers in this amperage range are HACR rated, meaning they are approved for use with heating, air conditioning, and refrigeration equipment.
Does the EJB34125SA include a visual trip indicator?
Yes, this breaker features the Square D Visi-Trip indicator. When the breaker trips, a highly visible red flag appears in the window to help you quickly identify the tripped circuit in the panelboard.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 13 reviews.
- JMJessica M.Verified BuyerReviewingSquare D EJB34060 - 60A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/16/26Exactly what we needed
Purchased the Square D EJB34060 60A 3-Pole circuit breaker for a commercial electrical application. The breaker arrived as described, was well packaged, and was the correct Square D part we needed.
Electrical components like this can sometimes be difficult to locate, so it was great to find the exact breaker without having to substitute or modify the existing equipment. Installation went smoothly and the breaker fit and operated as expected.
Very satisfied with the purchase and would order again when we need hard-to-find Square D electrical equipment.
- 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.