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Federal Pacific NJL631250R Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Federal Pacific
NJL631250R
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NJL631250R
Quantity
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Federal Pacific NJL631250R - 250A 3 Pole Molded Case Circuit Breaker
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Description
Finding exact replacements for discontinued Federal Pacific panelboards is essential for facility maintenance. This 250A, 3-pole bolt-on breaker installs into existing switchboards, eliminating the need for expensive system upgrades or adapter kits. Rated for 42kAIC at 240VAC, the NJL-frame unit utilizes fixed thermal and magnetic trip elements for consistent overcurrent protection. It serves as an exact match for the NJL631250 and is replaced by the newer NJL632250 aftermarket option.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NJL631250R-R |
| Series | NJL |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC |
| Frame Type | NJL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Switchboards, Panelboards |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | NEMA AB 1, UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Rotary Handle Mechanism |
Product FAQs
7 answersWhat is the difference between the NJL631250R and the NJL631250?
The NJL631250R serves as an exact match and direct replacement for the legacy NJL631250. Both are 250A, 3-pole, N-frame molded case circuit breakers designed for Federal Pacific switchboards.
Are there newer aftermarket alternatives for the NJL631250R?
Yes, the NJL632250 is often used as a newer aftermarket cross-reference option that fits the same N-frame footprint in legacy Federal Pacific panelboards.
Which enclosures or panels are compatible with the NJL631250R?
This breaker is designed for installation in legacy Federal Pacific (FPE) switchboards and panelboards that accommodate N-frame molded case circuit breakers. It requires adequate physical space and busbar configurations specific to the FPE N-frame footprint.
Can the trip settings on the NJL631250R be adjusted in the field?
No. This breaker features a fixed thermal and fixed magnetic trip unit. The long-time (overload) and instantaneous (short-circuit) pickup points are factory set and cannot be modified by the installer.
What are the conductor requirements for the factory lugs on this breaker?
The included lugs accept wire sizes from 4 AWG up to 350 kcmil. You can use either copper or aluminum conductors, but ensure proper termination practices, such as applying joint compound for aluminum wire, are followed.
How is the NJL631250R secured to the panel bus?
It utilizes a bolt-on connection. The breaker terminals must be bolted directly to the switchboard or panelboard bus bars using the appropriate FPE N-frame mounting hardware and torqued to the correct specifications to prevent high-resistance joints.
Is the NJL631250R interchangeable with FPE Stab-Lok breakers?
No. The NJL631250R is a commercial N-frame molded case circuit breaker. It is completely incompatible with residential Stab-Lok load centers, which use a different plug-on or bolt-on design.
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Reviews
Review summary
Customers rate this product 3.0 out of 5 based on 1 review.
Total 5 star reviews: 0 Total 4 star reviews: 0 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
1 review
- MNMichael N.Verified BuyerReviewingFederal Pacific NJL631300 - 300A 3 Pole Molded Case Circuit BreakerRated 3 out of 5 stars8/7/25Quick shipping 👍
Came missing lugs..
Wanna buy mine ? Tripping prematurely....
Michael 201-578-0628