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Federal Pacific NEF431040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Federal Pacific
NEF431040
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NEF431040
Quantity
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Federal Pacific NEF431040 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Operating with fixed thermal and magnetic trip mechanisms, this 40-amp breaker safeguards commercial wiring against overloads. It is engineered for three-phase systems and supports reverse feeding. Maintenance teams can install this unit into Federal Pacific NEF and CDP panelboards without compatibility issues. It serves as an exact physical match for aging N-frame infrastructure. Tested to withstand significant vibration, the breaker delivers an 18kA interrupt rating at 240VAC.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NEF431040-R |
| Series | NEF |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NEF Panelboards, CDP Panelboards |
| Wire Gauge | 14-2 AWG |
| 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, Bell Alarm |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5.1, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Reverse Feed, Vibration Tested |
Product FAQs
7 answersWhich panelboards are compatible with the NEF431040 circuit breaker?
This breaker is designed specifically for legacy Federal Pacific NEF and CDP series panelboards. It serves as an exact physical match for aging N-frame infrastructure, allowing you to maintain existing panels without aftermarket adapters.
Does the NEF431040 use a bolt-on or plug-in mounting connection?
The NEF431040 is a bolt-on circuit breaker. It secures directly to the panelboard bus using bolted connections, ensuring a reliable and stable fit for commercial and industrial applications.
Is the NEF431040 suitable for reverse-feed applications?
Yes, this thermal-magnetic breaker supports reverse feeding, allowing it to be back-fed in compatible electrical systems where the power source is connected to the load terminals.
What type of terminals are standard on the NEF431040?
This breaker comes equipped with standard mechanical lugs designed to accept 14 AWG to 2 AWG conductors. Ensure proper torque specifications are followed during installation to maintain a secure connection.
Can the NEF431040 be utilized in direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for up to 250VDC with a 10kA interrupting capacity, making it versatile for specific industrial DC control or distribution circuits.
Are the trip settings adjustable on the NEF431040?
No, this breaker features a non-interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) functions. It does not offer adjustable trip settings.
Is the NEF431040 suitable for high-vibration environments?
Yes, this breaker is tested to withstand significant vibration, ensuring stable operation and reliable overcurrent protection in demanding commercial and industrial applications.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 6 reviews.
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Rating
6 reviews
- SCStephen C.Verified BuyerReviewingFederal Pacific NEF431030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/21/26Fpe 3 pole 30 amp breaker.
I ordered the breaker on Thursday and it was at my house for Saturday morning. Breaker is in pristine condition. A real bail out. Thank you.
- MRMichael R.Verified BuyerReviewingFederal Pacific NEF431040 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Warehouse Air Compressor
Worked like a charm.
Thank you.
- DPDiana P.ReviewingFederal Pacific NEF433020 3 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/21Satisfied
Service was GREAT!!
- DJDavid J.ReviewingFederal Pacific / American NEF431100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/13/21This worked out great.
This worked out great.
- MWMark W.ReviewingFederal Pacific NEF421050 - 50A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/17/19Great service & pricing
Superbreakers did a great job for us. We called and asked if the breakers were actually in their possession. Withing 30 minutes they called us back (which is rare these days), and we got our breakers the next morning.