Free Shipping Over $99
Eaton / Westinghouse E3040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
E3040
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
E3040
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Eaton / Westinghouse E3040 - 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
20A 3 Pole Molded Case Circuit Breaker
Description
Built to maintain operational continuity in commercial environments, the 40A E3040 delivers essential overcurrent defense. Electricians can install this breaker into existing Westinghouse panelboards without modifying the enclosure. It replaces EHD3040 and EB3040 configurations. With a 7kA short-circuit rating at 240VAC, the device utilizes non-interchangeable trip technology to safeguard branch circuits.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | E3040-R |
| Series | E |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 7kA @ 240VAC, 5kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Eaton Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 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 | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
7 answersWhat other breaker configurations does the E3040 replace?
The E3040 serves as a direct replacement for older EHD3040 and EB3040 configurations in existing panelboards.
Can I install the E3040 in legacy Westinghouse panelboards?
Yes, this bolt-on breaker is designed to fit directly into existing Westinghouse and compatible Eaton panelboards without requiring any enclosure modifications.
Is the E3040 rated for use in DC applications?
Yes, in addition to its 240VAC rating, the E3040 is rated for direct current systems with a maximum interrupting capacity of 5kA at 250VDC.
Is the trip unit on the E3040 adjustable?
No, the E3040 features a non-interchangeable thermal-magnetic trip unit with fixed long-time and fixed instantaneous (LI) trip functions.
Are load-side lugs included with the E3040?
Yes, the breaker comes complete with factory-installed load-side lugs that accept 14 AWG to 1/0 AWG copper or aluminum wire.
What safety standards does the E3040 meet?
The E3040 is UL 489 listed, CSA approved, and meets NEMA AB-1 standards for molded case circuit breakers.
What is the ambient temperature rating for the E3040?
The E3040 is calibrated for standard operation in a 40 degrees Celsius ambient temperature environment.
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 5.0 out of 5 based on 25 reviews.
Total 5 star reviews: 24 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Reviews Summary
Generated by AI from 30 most recent customer reviews
Last updated 8/15/25
Customers say this electrical breaker meets their expectations in terms of functionality and performance. Many reviews mention quick delivery times and competitive pricing. While one user reports voltage detection issues, most find these units work effectively. Common feedback includes satisfaction with product condition upon arrival and straightforward installation. Reviews indicate availability of specialty models that are often hard to find through local suppliers.
Search
Rating
25 reviews
- MGMike G.Rated 5 out of 5 stars11/27/23Just what we needed and
Just what we needed and fast shipping
- TETimothy E.ReviewingSquare D HU364 Safety SwitchI recommend this productRated 5 out of 5 stars5/9/22quick response!!!!
quick response!!!!
- DGDavid G.ReviewingSquare D HU362 Safety SwitchI recommend this productRated 5 out of 5 stars4/13/22Great service and fast shipping
Great service and fast shipping
- WEWarren E.ReviewingSquare D HU361 Safety SwitchI recommend this productRated 5 out of 5 stars3/1/22600v Disconnect
They have GREAT Inventory! Even my Local suppliers did not have them in stock.
- SKSaki K.ReviewingSquare D HU361 Safety SwitchI recommend this productRated 5 out of 5 stars2/20/22Good product
Good product in good price