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Square D EJB E-Frame Miniature Circuit Breaker, Bolt-On
The Square D EJB E-Frame Miniature Circuit Breaker is a bolt-on lighting panelboard circuit breaker engineered for use in Square D NF Panelboards. Available in 1-Pole and 3-Pole configurations, this device is rated 480Y/277VAC and delivers reliable short-circuit and overload protection with Switching Duty, HACR, and HID application ratings. Backed by cULus listing and TAA compliance, it is built for demanding commercial and industrial branch-circuit protection where dependable field-proven performance is required.
Key Features
- Pole Configuration: Offered in 1-Pole and 3-Pole versions to match a wide range of lighting panelboard circuit requirements.
- Bolt-On Connection: Designed for bolt-on mounting in Square D NF Panelboards for a secure, field-proven fit.
- Operational Voltage: Rated 480Y/277VAC for lighting panelboard branch circuits.
- Protection Type: Provides short-circuit and overload protection for connected loads.
- Circuit Breaker Application: Switching Duty rated, HACR rated, and HID rated for versatile lighting and HVAC circuit use.
- Electrical Connection: Aluminium lugs accept AWG 12...AWG 6 aluminium or AWG 14...AWG 6 copper conductors.
- Tightening Torque: 3.4-3.4 N.m across 2.5-16 mm² (AWG 14...AWG 6) terminal range.
- Visi-Trip Indication: Troubleshoot faster with Visi-Trip™ trip indication.
- Ambient Air Temperature: Rated for operation at 40°C ambient.
Certifications & Compliance
- cULus Listed
- TAA Compliant
- RoHS Exemption Documented
- Mercury Free
Technical Specifications
- Connection Type: Bolt On
- Device Short Name: EJB
- Warranty Period: 18 months
- Product Certifications: cULus
- Compliance: TAA
- Mercury Free: Yes
- Sustainable Packaging: Yes
- Packaging Made With Recycled Cardboard: Yes
- Without Single Use Plastic: Yes
- Serviceability: No
- ROHS Exemption Information: Yes
Typical Applications
- Lighting Panelboard Circuit Protection
- Square D NF Panelboard Systems
- Commercial and Industrial Electrical Installations
- HACR and HID Rated Circuit Applications
- Switching Duty Branch-Circuit Protection
Why Square D?
Square D EJB E-Frame breakers combine cULus-listed, TAA-compliant construction with Visi-Trip trip indication for faster troubleshooting in the field. Available in 1-Pole and 3-Pole configurations and built for Switching Duty, HACR, and HID applications, they deliver dependable short-circuit and overload protection engineered specifically for Square D NF Panelboards, giving electrical professionals a trusted bolt-on solution for lighting panelboard branch circuits.
"Manufacturer Resources
Product Specs
- Product Type:
- Circuit Breaker
- Series:
- E-Frame
- Connection Type:
- Bolt On
- Voltage Rating:
- 480Y/277VAC
- Listing:
- cULus
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Configuration:
- 1-Pole or 3-Pole
- Product Subgroup:
- Circuit Breakers
- Product Depth:
- 4.05 in
- Product Height:
- 5.66 in
Square D EJB14015 – Frequently Asked Questions
1) Will a Square D EJB breaker fit in an NF panelboard, or do I need a plug-in style?
The EJB E-Frame breaker is a bolt-on device made for Square D NF lighting panelboards. It bolts to the panel bus rather than snapping on, so it will not work in a plug-in-only interior. If the panel you are working in takes plug-on branch breakers, the EJB is the wrong connection style for it.
2) Can I use the Square D EJB on a 480Y/277V lighting circuit?
Yes, 480Y/277VAC is exactly what the EJB is rated for. It is a lighting panelboard branch breaker for grounded wye 480/277 systems. It is not a 240V breaker, so do not substitute it into a 120/240V single-phase panel.
3) What wire size will the lugs on the Square D EJB take?
The aluminium lugs accept AWG 12 through AWG 6 aluminium or AWG 14 through AWG 6 copper. Terminal torque is 3.4 N.m across the 2.5 to 16 mm2 (AWG 14 to AWG 6) range. Anything larger than #6 will not land in this breaker.
4) Is the Square D EJB breaker UL listed and TAA compliant for a government job?
The EJB is cULus Listed and TAA compliant, with RoHS exemption documented and a mercury-free declaration. Country of origin is Mexico. That combination is what most federal and institutional specs are looking for on branch breakers.
5) Can I use an ABB ST200M miniature breaker in place of a Square D EJB?
No. The ABB ST200M is a C-curve miniature breaker listed to UL1077, which is a supplementary protector standard, while the Square D EJB is a cULus listed branch-circuit breaker for Square D NF panelboards with short-circuit and overload protection at 480Y/277VAC. A supplementary protector does not serve as branch-circuit protection, and the ST200M is a DIN-rail style device rather than a bolt-on panelboard breaker.
6) What is the closest bolt-on alternative to the Square D EJB E-Frame breaker?
The Eaton BAB series Quicklag thermal-magnetic breaker is also a bolt-on miniature breaker, so it is the nearest match in mounting style to the Square D EJB, which uses a bolt-on connection. The difference that decides the job is the panel and the voltage class: the EJB is rated 480Y/277VAC and is built for Square D NF lighting panelboards, while the Eaton BAB three-pole Quicklag industrial breaker is a 240V device. Confirm the panelboard interior you are feeding before swapping between them.
7) Does the EJB come in single pole and three pole?
Both. The EJB is offered as a 1-pole and a 3-pole breaker, so you can cover a single 277V lighting leg or a three-phase 480V load from the same family. Pole count is the option you pick when ordering.
8) Is the EJB rated for HVAC and HID lighting loads?
It carries Switching Duty, HACR and HID application ratings, which covers 277V HID fixture circuits and HVAC equipment branch circuits as well as switched lighting duty. That combination is why it gets specified in commercial lighting panels.
9) Will the Eaton BAB bolt-on breaker work as a substitute for a Square D EJB?
No. The Eaton BAB Quicklag is also a bolt-on thermal-magnetic breaker, but the BAB three-pole version we carry is a 240V device and Eaton bus geometry is not interchangeable with Square D NF panelboards. For an NF lighting panel at 480Y/277V, stay with the EJB. The BAB is the choice when the panel itself is Eaton.
10) Is the EJB a miniature breaker or a molded case breaker? I need to know what space to leave.
It is a miniature circuit breaker for branch circuits, not a molded case breaker. Published dimensions are 5.66 in height and 4.05 in depth. If your drawing calls for a molded case device with adjustable or interchangeable trip, you want something like the ABB A2 Series or the Eaton Series C K-Frame instead.
11) When should I specify a molded case breaker instead of the Square D EJB E-Frame?
The Square D EJB is a miniature bolt-on breaker sized for lighting panelboard branch circuits, with aluminium lugs accepting AWG 12 to AWG 6 aluminium or AWG 14 to AWG 6 copper. Once the feeder conductor or the frame size outgrows that range, you move to a molded case device such as the ABB A2A150TT in the A2 Series or the ABB XT5 three-pole kit. Those are separate frame families, not drop-in replacements for an NF panelboard branch position.
12) Is a Bussmann CBC breaker an alternative to the Square D EJB?
No, they serve different systems. The Bussmann CBC is a Type I automotive circuit breaker rated 14VDC, and the CBF is a Type II automotive device. The Square D EJB is a 480Y/277VAC bolt-on panelboard breaker for commercial and industrial lighting branch circuits, so the two families are not interchangeable in either direction.
13) I need a three-pole breaker for an HVAC circuit - EJB or an Eaton equivalent?
The Square D EJB is offered in 1-pole and 3-pole configurations and carries Switching Duty, HACR, and HID application ratings, so the 3-pole EJB34090 covers HVAC branch circuits at 480Y/277VAC in an NF panelboard. If the panel is a 240V Eaton interior, the three-pole Quicklag BAB-302 thermal-magnetic breaker is the comparable three-pole device in that line. The deciding factor is which panelboard interior accepts the breaker.
14) How do I tell which EJB breaker tripped in a panel full of them?
The EJB uses Visi-Trip indication: the tripped breaker shows a visible indicator at the handle, so you can spot the faulted pole without testing each device. Useful on a maintenance call in a large lighting panelboard.
15) Can the Square D EJB breaker be repaired or serviced if it fails?
No. The EJB is listed as non-serviceable, so a failed breaker gets replaced rather than rebuilt. It also ships in recycled cardboard packaging with no single-use plastic if your facility tracks packaging waste.
16) Is the EJB good at 40 degrees C in a hot electrical room?
Its ratings are stated at 40 C ambient air temperature, which is the standard calibration point for panelboard breakers. In an electrical room that runs consistently hotter, expect derating per the installation requirements for the panel.
17) Does the Square D EJB come as a kit like the ABB XT4 breaker?
No. The ABB MBB33 is sold as an XT4 series three-pole molded case breaker kit, and the MBM334 is an XT5 three-pole kit. The Square D EJB is an individual bolt-on breaker ordered by pole count, EJB14015 for 1-pole and EJB34090 for 3-pole, and installs directly into a Square D NF panelboard.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D EJB14015 come with a warranty?
Absolutely. The Square D EJB14015 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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