Eaton / Westinghouse EH1040 Molded Case Circuit Breaker
- 40A
- 1 Pole
- Bolt-On
Quantity
Eaton / Westinghouse EH1040 - 40A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Manufactured to support aging infrastructure, this single-pole 40-amp thermal-magnetic breaker handles commercial electrical loads. It mounts into standard Eaton and Westinghouse NEHB panelboards, maintaining the original bolt-on configuration. Facility managers can utilize this component to replace hard-to-find EHB1040 or EHD1040 units without modifying the enclosure. Rated for 14kA interrupting capacity at 277VAC, the HACR-rated device accommodates 14 to 1/0 AWG aluminum or copper wiring.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | EH1040-R |
| Series | EH |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 14kA @ 277VAC, 10kA @ 125VDC |
| Frame Type | EH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse NEHB Panelboards, Eaton NEHB Panelboards |
| Wire Gauge | 14 AWG - 1/0 AWG (Al/Cu) |
| 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, Alarm Switch |
|---|---|
| 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 |
Product FAQs
6 answersWhat panelboards accept the EH1040 circuit breaker?
The EH1040 is a bolt-on breaker specifically designed for installation in Eaton and legacy Westinghouse NEHB panelboards.
Is there a difference between the Eaton EH1040 and the Westinghouse EH1040?
No. Eaton acquired the Westinghouse electrical distribution line, and the EH1040 catalog number remains the exact same component. They are fully interchangeable in compatible NEHB enclosures.
What breaker frame family does the EH1040 belong to?
It is part of the legacy Westinghouse E-Frame family, which dictates its physical dimensions and mounting footprint for NEHB panelboards.
Can the EH1040 be applied in direct current (DC) systems?
Yes, this breaker is rated for 125VDC applications with a 10kA interrupting capacity. This makes it suitable for specific DC control circuits and industrial DC distribution.
What type of trip protection does the EH1040 provide?
It features a fixed thermal-magnetic trip unit. The thermal element provides long-time overload protection, while the magnetic element offers instantaneous response to short-circuit faults.
What wire sizes and materials are compatible with the EH1040 lugs?
The standard lugs accommodate 14 AWG through 1/0 AWG wire. Both aluminum and copper conductors are accepted, provided they are terminated according to the manufacturer torque specifications.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
- TSThomas S.Verified BuyerReviewingSiemens EH3B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/6/25Great
Thanks
- JMJim M.ReviewingSiemens EH3B040 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/24/23They fit perfectly and saved
They fit perfectly and saved us a lot of money by being able to replace just these breakers
- KHKen H.ReviewingSiemens EH3B030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/12/23Great service
Great service and products fast shipping
- JSJerry S.ReviewingSiemens / ITE EH3B070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/20/22Great Price - Breakers Work Fine
My local Supplier was charging me three times the price for a breaker that i bought on super Breakers.
- MRMatt R.ReviewingSiemens EH3B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/6/2020 Amp Breaker
Received item quickly and in great shape. Thank you!!!