Square D EHB34040-1082 Miniature Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Quantity
Square D EHB34040-1082 - 40A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Description
Built for circuit protection, the Square D EHB34040-1082 miniature circuit breaker is rated 40A with 3 poles for 3-phase operation. Voltage ratings are 240VAC and 480Y/277VAC, with an interrupting rating of 14kAIC at 480Y/277VAC. This E-Frame, EHB series breaker uses bolt-on mounting and lug terminals. Fixed thermal and fixed magnetic tripping provide long-time and instantaneous protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | EHB34040-1082 |
| Series | EHB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 14kA @ 480Y/277VAC |
| Frame Type | EH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NEHB Panelboards |
| Max Wire | 2 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
7 answersHow should I select the 40A rating on the Square D EHB34040-1082?
Select the 40A rating to coordinate with the circuit load and conductor ampacity under applicable installation requirements. The ampere rating governs circuit protection; it is separate from the interrupting rating used to evaluate available fault current.
What does the 240VAC, 480Y/277VAC voltage rating mean for circuit selection?
Match the circuit voltage and system configuration to the 240VAC or 480Y/277VAC rating. The Y indicates a wye system, so the system configuration matters as well as the voltage.
How do I use the 14kAIC at 480Y/277VAC interrupting rating?
Compare the available fault current at the installation point with the 14kAIC interrupting rating at 480Y/277VAC. At that voltage, available fault current must not exceed the interrupting rating.
Can I adjust the thermal or magnetic trip settings?
No. Both the thermal and magnetic trip settings are fixed. The thermal-magnetic mechanism provides long-time response to sustained overloads and instantaneous response to high-current faults, so select it where fixed trip behavior suits the protection requirements.
What does bolt-on mounting mean during installation?
Bolt-on mounting uses a bolted attachment rather than a plug-on connection. Plan for fastening the breaker during installation and follow the manufacturer's installation procedure.
How are conductors terminated on this breaker?
The terminal connections use lugs to secure the conductors. Prepare and seat each conductor correctly, then tighten the lug connection according to the manufacturer's installation instructions.
How does the three-pole arrangement affect conductor connections?
The Square D EHB34040-1082 has three poles for the three phase conductors. Plan phase-conductor terminations at those poles rather than a neutral connection.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 20 reviews.
- WDWilliam D.Verified BuyerReviewingSquare D EHB14020 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/13/26Excellent breaker at an excellent price
I ordered 2 recertified breakers. They came clean and well packaged. Both functioned perfectly and got me out of a bind. I buy breakers from SuperBreakers almost every week, and they never cease to impress!
- TSThomas S.Verified BuyerReviewingSquare D EHB24060 - 60A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/28/26President NGE
The quality is excellent, but you need to double check when you order that the corrected one gets delivered
- MDMitchell D.Verified BuyerReviewingSquare D EHB14020HID - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars2/4/26Hard to find
Super breakers has just what I was looking for when no one else did!!
- MSMike S.Verified BuyerReviewingSquare D EHB34060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/21/25Fast reliable service, reasonable prices
I recently ordered the incorrect breakers for a job, but I contacted Drew at SuperBreakers and he got me the correct breakers shipped out that day, which I received the next day. He sent me a label to send the wrong breakers back, and I was quickly refunded a restocking fee that I incurred for my mistake. I was able to get the breakers installed, and the power running to meet the deadline. Not to mention, the price was better than I found elsewhere. Thanks Drew!
I would definitely recommend this company if you need fast, reliable service for your electrical product needs. And I'm sure I will use them again.
Thank you SuperBreakers! Nice job Drew!
- DTDavid T.ReviewingSquare D EHB14020 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/12/23Everything worked out perfect thanks
Everything worked out perfect thanks again