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Square D EJB24030 Miniature Circuit Breaker
- 30A
- 2 Pole
- Bolt-On
Square D
EJB24030
Miniature Circuit Breaker
Brand
Square D
SKU
EJB24030
Quantity
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Square D EJB24030 - 30A 2 Pole Miniature Circuit Breaker
New
Quantity
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Square D EJB24030 - 30A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 30A |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 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 | 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 |
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Square D EJB24030 - 30A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 30A |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 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 | 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 |
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Description
Handling up to 100 kAIC at 240VAC, this 30-amp miniature circuit breaker ensures reliable overcurrent protection for commercial operations. The E-Frame architecture is optimized for consistent thermal-magnetic performance. Integration into Square D NF panelboards is achieved through a dependable bolt-on mounting mechanism. It accepts a wide range of copper and aluminum conductors via standard lug terminals.Specifications
| Brand | Square D |
|---|---|
| Series | EJB |
| Amperage | 30A |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 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 | 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
7 answersWhich panelboards are compatible with the EJB24030 circuit breaker?
This E-frame breaker is designed exclusively for use in Square D NF series panelboards. It will not fit in NQ or I-Line panelboards.
What is the difference between the EJB24030 and the EDB24030 or EGB24030?
The difference lies in the interrupting capacity at 480Y/277VAC. The EDB series is rated at 18kAIC, the EGB series at 35kAIC, and this EJB series offers the highest rating at 65kAIC. All three share the same physical footprint and fit the same NF panelboards.
Can the EJB24030 be installed on a 480V ungrounded delta system?
No. This breaker has a 480Y/277VAC slash rating, meaning it is only approved for solidly grounded wye systems where the voltage to ground does not exceed 277VAC. It is not rated for ungrounded or corner-grounded delta systems.
How does the interrupting rating (AIC) change based on system voltage?
The breaker provides a maximum interrupting capacity of 100kA at 120VAC and 240VAC. When installed in a 480Y/277VAC system, the rating drops to 65kA.
What wire sizes are accepted by the terminals on the EJB24030?
The factory-installed lugs accommodate 14 AWG to 6 AWG copper (Cu) conductors, or 12 AWG to 6 AWG aluminum (Al) conductors.
Does this breaker plug onto the panel bus?
No, the EJB24030 features a bolt-on connection. It must be physically bolted to the busbar of the NF panelboard, which provides a highly secure, vibration-resistant electrical connection compared to plug-on designs.
Are the trip settings adjustable on the EJB24030?
No, this breaker utilizes fixed thermal-magnetic trip technology. Both the long-time (overload) and instantaneous (short circuit) trip functions are factory set and cannot be adjusted in the field.
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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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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 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.