Square D EJB34050SA Miniature Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Quantity
Square D EJB34050SA - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Featuring a factory-installed shunt trip, the Square D EJB34050SA is a 3-pole, 50A miniature circuit breaker built for automated shutdown control. It provides thermal-magnetic protection with fixed long-time and instantaneous trip functions. This E-Frame breaker installs into Square D NF panelboards using a secure bolt-on connection. It includes load-side lugs compatible with 14-2/0 AWG copper or 12-2/0 AWG aluminum wire. Rated at 65 kAIC at 480Y/277VAC, it delivers high interrupting capacity.Specifications
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 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 | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, HACR, HID, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
Product FAQs
8 answersWhat does the "SA" suffix indicate on the EJB34050SA catalog number?
The "SA" suffix denotes a factory-installed shunt trip with a 110 to 130VAC control voltage. This feature allows the breaker to be tripped remotely for emergency power-off (EPO) systems or automated safety shutdowns.
How many panel spaces does the EJB34050SA require?
While it is a 3-pole breaker, it requires 4 mounting spaces in your panelboard. The factory-installed shunt trip module occupies one additional space alongside the three poles.
Can I add a shunt trip to a standard EJB 3-pole breaker in the field?
No. Shunt trips for Square D E-frame circuit breakers are factory-installed only. You must order a breaker with the "SA" suffix, like the EJB34050SA, if remote tripping is required.
Which panelboards are compatible with the EJB34050SA?
This E-frame bolt-on breaker is designed exclusively for Square D NF series panelboards. It will not fit in NQ panelboards, which use QOB breakers, or I-Line panelboards.
What are the magnetic trip settings for this 50A breaker?
The instantaneous magnetic trip unit on the EJB34050SA has a hold current of 630A and a trip current of 1800A.
What are the recommended lug torque specifications for the EJB34050SA?
For the load-side lugs, tighten 14 to 10 AWG wire to approximately 35 lb-in. For larger 8 to 2/0 AWG wire, tighten to approximately 50 lb-in.
Does the EJB34050SA feature a Visi-Trip indicator?
Yes. It includes a Visi-Trip indicator that provides a clear visual signal when the breaker has tripped due to an overcurrent, short circuit, or a remote shunt trip command.
What is the difference between the EDB34050SA, EGB34050SA, and EJB34050SA?
The difference lies in their interrupting capacity (AIC) ratings. The EJB34050SA offers the highest rating at 65kAIC at 480Y/277VAC. The EGB version is rated for 35kAIC, and the EDB version is rated for 18kAIC at the same voltage.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 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.