Free Shipping Over $99
Eaton / Westinghouse EHB3040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
EHB3040
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
EHB3040
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Eaton / Westinghouse EHB3040 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Similar Items
30A 3 Pole Molded Case Circuit Breaker
25A 3 Pole Molded Case Circuit Breaker
60A 3 Pole Molded Case Circuit Breaker
Description
Manufactured by Eaton, the EHB3040 is a 40A, 3-pole molded case circuit breaker built for commercial applications. It features a fixed thermal-magnetic trip unit for reliable long-time and instantaneous protection. This bolt-on MCCB fits seamlessly into legacy Westinghouse panelboards without adapters. Serving as a direct cross-reference for older systems, it is officially replaced by the EHD3040. Rated for 14 kAIC at 480Y/277V, it is HACR rated and includes load-side lugs.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | EHB3040-R |
| Series | EHB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480Y/277VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards |
| Wire Gauge | 14-2 AWG (Cu/Al) |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Visual Trip Indicator, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
8 answersIs the Westinghouse EHB3040 circuit breaker obsolete?
Yes, the original Westinghouse EHB series is obsolete. Eaton now manufactures the EHD3040 as the modern, direct cross-reference replacement, offering the exact form, fit, and function for legacy systems.
Which panelboards accept the EHB3040 breaker?
This bolt-on breaker is designed as a direct fit for legacy Westinghouse panelboards. It is also compatible with Eaton Pow-R-Line C and F-Frame panelboards without requiring any adapters or retrofit kits.
Can this breaker be used in direct current (DC) applications?
Yes, it is rated for DC applications up to 250VDC with a 10kA interrupting capacity. When installing in DC systems, consult Eaton technical guidelines to determine if poles must be wired in series for your specific voltage.
Are retrofit kits required to install this breaker in older Westinghouse panels?
No, the EHB3040 is an exact fit for compatible legacy Westinghouse panelboards. It bolts directly onto the bus, preserving the original equipment design without modifications.
Where can I find the correct lug torque specifications for the EHB3040?
Terminal torque requirements are printed directly on the breaker nameplate. The required torque value depends on the specific wire gauge being used within the accepted 14 to 2 AWG range.
What safety checks are required before replacing an existing EHB breaker?
Always verify the panel is completely de-energized. Confirm that the replacement matches the original 40-amp rating, bolt-on mounting configuration, and interrupting capacity to ensure safe operation and code compliance.
Does the EHB3040 support interchangeable trip units?
No, this breaker features a fixed thermal-magnetic trip unit. The long-time and instantaneous trip functions cannot be adjusted or swapped out in the field.
What type of wire material is permitted for the load terminals?
The factory-installed lugs accept both copper and aluminum conductors ranging from 14 AWG to 2 AWG. Ensure an approved oxide inhibitor is used when terminating aluminum wire to prevent corrosion and maintain a safe connection.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
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.
Expedited Shipments
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.
International Shipping
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 4.8 out of 5 based on 19 reviews.
Total 5 star reviews: 16 Total 4 star reviews: 3 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Search
Rating
19 reviews
- 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
- GCGULF C.ReviewingSquare D EHB34020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/5/23Perfect condition
This breaker arrived as advert and timely. Perfect condition. Good working condition