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Square D EJB14050 Miniature Circuit Breaker
- 50A
- 1 Pole
- Bolt-On
Square D
EJB14050
Miniature Circuit Breaker
Brand
Square D
SKU
EJB14050
Quantity
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Square D EJB14050 - 50A 1 Pole Miniature Circuit Breaker
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Description
Built for commercial applications, the Square D EJB14050 provides 50A of dependable thermal-magnetic trip functionality. It safeguards electrical infrastructure against overloads and short circuits with precision. Designed exclusively for Square D NF panelboards, this E-Frame breaker features a secure bolt-on mounting style. The included load-side lugs accommodate a wide range of wire sizes. With a 65 kAIC rating at 277V, it handles high fault currents.Specifications
| Brand | Square D |
|---|---|
| Part Number | EJB14050 |
| Series | EJB |
| Amperage | 50A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 277VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 240VAC, 65kA @ 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, HID, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, cULus, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Visual Trip Indicator |
Product FAQs
5 answersCan the Square D EJB14050 replace an EDB14050 or EGB14050?
Yes. The EJB14050 shares the exact physical dimensions and E-frame bolt-on design as the EDB14050 and EGB14050. It serves as a direct upgrade, providing a higher interrupting rating of 65kA at 277V compared to the EDB (18kA) and EGB (35kA) models.
What are the lug torque specifications for the EJB14050?
The required tightening torque depends on the conductor size. Torque 14 to 10 AWG wire to 34.5 lb-in (3.9 N.m). Torque 8 to 2/0 AWG wire to 49.6 lb-in (5.6 N.m).
Can I install the EJB14050 in an NQ or I-Line panelboard?
No. The EJB14050 is an E-frame bolt-on breaker designed exclusively for Square D NF series panelboards. It is not compatible with NQ, I-Line, or QO load centers.
What does the "J" in the EJB14050 catalog number signify?
The "J" designates the interrupting rating tier within the Square D E-frame family. It indicates a 65kA interrupting capacity at 277VAC, which is the highest rating available in this frame size, exceeding the standard "D" and "G" tiers.
Is the EJB14050 rated for HVAC and lighting applications?
Yes, this breaker is HACR rated for use with heating, air conditioning, and refrigeration equipment. It is also HID (High-Intensity Discharge) rated for lighting circuits.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 13 reviews.
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Rating
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.