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Square D EJB24040 Miniature Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Square D
EJB24040
Miniature Circuit Breaker
Brand
Square D
SKU
EJB24040
Quantity
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Square D EJB24040 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D EJB24040 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB24040 |
| Series | EJB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 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, HID, 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 |
Sold out
Quantity
Square D EJB24040 - 40A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | EJB24040-R |
| Series | EJB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 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, HID, 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 |
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Description
Designed for commercial and industrial distribution, the Square D EJB24040 is a 40A, 2-pole miniature circuit breaker. It offers reliable thermal-magnetic protection with fixed trip settings for long-time and instantaneous functions. This E-frame breaker is specifically built to mount into Square D NF panelboards using a bolted connection. It boasts a high interrupting capacity of 65 kA at 480Y/277V and includes the signature Visi-Trip red indicator flag for simplified troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Part Number | EJB24040 |
| Series | EJB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 100kA @ 240VAC, 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, HID, 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
7 answersWhat panelboards are compatible with the EJB24040?
The EJB24040 is an E-frame bolt-on circuit breaker designed specifically for use in Square D NF series panelboards.
Can I use the EJB24040 in a Square D NQ panelboard?
No, NQ panelboards are designed for QO and QOB series breakers up to 240VAC. The EJB24040 is an E-frame breaker designed exclusively for NF panelboards up to 480Y/277VAC.
What is the difference between Square D EDB, EGB, and EJB breakers?
They share the same physical footprint and mount in NF panelboards, but they have different interrupting ratings. EDB is rated 18kA, EGB is 35kA, and EJB is 65kA at 480Y/277VAC. The EJB24040 offers the highest interrupting rating in this frame size.
What are the wire size and torque specifications for the EJB24040 lugs?
The lugs accept 14 to 2/0 AWG copper or 12 to 2/0 AWG aluminum wire. The required tightening torque is 34.5 lbf-in (3.9 N-m) for 14 to 10 AWG wire, and 49.6 lbf-in (5.6 N-m) for 8 to 2/0 AWG wire.
Does the EJB24040 include a trip indicator?
Yes, it features a Visi-Trip indicator that provides a clear visual signal when the breaker has tripped, making it easier to identify faults in the panelboard.
Can the EJB24040 be reverse fed?
Yes, Square D E-frame breakers like the EJB24040 can be back-fed or reverse fed, as they do not have a Line or Load marking restriction.
Is the EJB24040 HACR rated?
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 applications.
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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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Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
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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.