Federal Pacific NFJ424200 Molded Case Circuit Breaker
- 200A
- 2 Pole
- Bolt-On
Quantity
Federal Pacific NFJ424200 - 200A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to support existing industrial systems, this 200-amp thermal-magnetic breaker provides essential LI protection functions. It fastens securely into legacy Federal Pacific panelboards, offering a seamless fit for commercial maintenance projects. With a 25kAIC rating at 240VAC and adjustable magnetic trip capabilities, the unit ensures precise fault response in demanding electrical environments.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ424200-R |
| Series | NFJ |
| Amperage | 200A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC |
| Frame Type | NFJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
8 answersWhat type of panelboards accept the NFJ424200 circuit breaker?
This bolt-on molded case circuit breaker is designed exclusively for legacy Federal Pacific (FPE) panelboards configured to accept N-Frame or NFJ frame breakers. It will not fit in standard residential load centers.
Can the trip settings on the NFJ424200 be adjusted?
Yes, this breaker features a thermal-magnetic trip unit with an adjustable magnetic element. While the thermal overload protection is fixed, the magnetic instantaneous trip can be adjusted to customize the short-circuit response for specific loads.
What wire sizes do the load side lugs on this breaker accommodate?
The factory-installed load side lugs accept wire gauges ranging from 4 AWG up to 300 kcmil. When terminating, ensure the selected conductor meets NEC ampacity requirements for a 200A circuit.
What type of protection does the LI trip function provide?
The LI designation indicates the breaker provides Long-Time (L) thermal protection against sustained overloads and Instantaneous (I) magnetic protection against short circuits.
How does the NFJ424200 mount to the panelboard bus?
This is a bolt-on circuit breaker that requires a direct, bolted connection to the panelboard busbars. It is not compatible with plug-on, Stab-Lok, or I-Line style panel configurations.
Is the NFJ424200 part of the Federal Pacific Stab-Lok series?
No, the NFJ424200 is a commercial and industrial molded case circuit breaker with a bolt-on connection. It is entirely separate from the residential Stab-Lok product line.
Can this 2-pole breaker be installed in a 3-phase panelboard?
Yes, while it is a 2-pole breaker designed for single-phase loads, it can be installed in a 3-phase Federal Pacific panelboard to feed a 240V or 480V single-phase branch circuit by connecting to two phases of the bus.
How does the interrupting capacity of the NFJ424200 change based on system voltage?
The breaker provides a higher fault current rating at lower voltages. It delivers 25kAIC when installed on a 240VAC system, but the interrupting capacity drops to 18kAIC when applied to a 480VAC system. Always verify the available fault current at your panel before installation.
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Reviews
Review summary
Customers rate this product 4.7 out of 5 based on 3 reviews.
- ESEvan S.Verified BuyerReviewingFederal Pacific NFJ631225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26Review
Works great!
- RCRalph C.Verified BuyerReviewingFederal Pacific NFJ631150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars11/10/25Federal Pacific NF J631150 Breaker
Surprised they had it!
Great shape, well packaged. Fast shipping
- KPKeith P.ReviewingFederal Pacific NFJ631200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/15/20Quick and easy ordering
Quick and easy ordering