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Federal Pacific NEF421100 Molded Case Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Federal Pacific
NEF421100
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NEF421100
Quantity
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Federal Pacific NEF421100 - 100A 2 Pole Molded Case Circuit Breaker
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Description
Restoring power to older commercial facilities requires exact-fit components like the Federal Pacific NEF421100. This 2-pole, 100-amp molded case circuit breaker delivers essential thermal-magnetic protection for industrial distribution systems operating up to 480VAC or 250VDC. Designed as a drop-in replacement, it bolts into legacy FPE NEF panelboards without requiring aftermarket adapters. The breaker provides a 14kAIC rating at 480V and features a vibration-tested, reverse-feed design.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NEF421100-R |
| Series | NEF |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NEF Panelboards |
| Wire Gauge | 4-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Bell Alarm |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2, 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 NEF421100 circuit breaker?
This bolt-on breaker is designed specifically for use in legacy Federal Pacific NEF series panelboards.
Is there a direct cross-reference or replacement available for the NEF421100?
Yes, the Federal Pacific HEG421100 serves as an exact replacement. It fits the same legacy panels but offers a higher interrupting rating of 22kAIC at 480VAC.
Can the NEF421100 be used in direct current applications?
Yes, this breaker carries a DC interrupting rating of 10kAIC at 250VDC, making it suitable for compatible direct current circuits.
Are the trip settings on the NEF421100 adjustable?
No, this breaker utilizes a fixed thermal-magnetic trip unit. The long-time and instantaneous trip functions are factory-set and cannot be adjusted in the field.
What wire sizes do the factory lugs on this breaker accept?
The included lugs accommodate wire gauges ranging from 4 AWG up to 1/0 AWG. Ensure proper torque specifications are followed during installation.
Does the NEF421100 require specialized mounting hardware?
It features a standard bolt-on connection designed to mount directly to the busbars of legacy Federal Pacific NEF panelboards without requiring aftermarket adapters.
Is this breaker part of the residential Stab-Lok series?
No, the NEF421100 is an N-frame molded case circuit breaker designed for commercial and industrial Federal Pacific NEF panelboards, not residential Stab-Lok load centers.
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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.