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Square D EJB14045 Miniature Circuit Breaker
- 45A
- 1 Pole
- Bolt-On
Square D
EJB14045
Miniature Circuit Breaker
Brand
Square D
SKU
EJB14045
Quantity
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Square D EJB14045 - 45A 1 Pole Miniature Circuit Breaker
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Description
Belonging to the E-Frame series, the Square D EJB14045 delivers 45A of miniature circuit breaker protection for commercial and industrial electrical systems. It provides robust thermal-magnetic trip functionality for branch circuits. This breaker installs into Square D NF panelboards using a secure bolt-on connection. It accepts 14-2/0 AWG copper or 12-2/0 AWG aluminum wire via standard box lugs. Rated for 65 kAIC at 277VAC, it ensures high-level fault protection.Specifications
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 45A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 277VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 240VAC, 65kA @ 277VAC |
| Frame Type | E |
|---|---|
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Standard Aluminum Lugs |
| 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
6 answersWhich panelboards are compatible with the Square D EJB14045?
The EJB14045 is a bolt-on E-Frame breaker designed exclusively for use in Square D NF series panelboards.
Can I use the EJB14045 to replace an EDB14045 or EGB14045?
Yes. The EJB14045 shares the same physical dimensions and mounting as EDB and EGB breakers but offers a higher interrupting rating. It is a direct, upgraded replacement for lower-rated E-Frame breakers in NF panelboards.
What does the J in the EJB14045 part number signify?
The J designates the interrupting rating tier. In the Square D E-Frame lineup, EDB is standard, EGB is high-interrupting, and EJB is the highest tier, providing 65kAIC at 277VAC.
What wire sizes and torque specifications apply to the EJB14045 lugs?
The lugs accept 14 to 2/0 AWG copper or 12 to 2/0 AWG aluminum wire. The recommended tightening torque is 34.5 lb-in for 14 to 10 AWG wire and 49.6 lb-in for 8 to 2/0 AWG wire.
How is the EJB14045 secured inside the panelboard?
The EJB14045 is a bolt-on circuit breaker. It secures directly to the bus of a Square D NF panelboard using mounting screws, providing a robust connection for commercial and industrial applications.
What type of protection does the EJB14045 trip unit provide?
It features a fixed thermal magnetic trip unit with long-time and instantaneous (LI) trip functions. This provides standard protection against both sustained overloads and sudden short circuits.
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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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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.