Federal Pacific HFJ437125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Federal Pacific
HFJ437125
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
HFJ437125
Quantity
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Federal Pacific HFJ437125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
A crucial component for facility maintenance, the Federal Pacific HFJ437125 is a 125A, 3-pole molded case circuit breaker. It provides essential overcurrent protection for commercial power distribution. This unit is engineered to mount into legacy Federal Pacific panels and switchgear. It acts as an exact replacement for the discontinued NFJ437125. Equipped with a quick-make/quick-break mechanism, it safely interrupts faults up to 22kA at 480VAC with fixed thermal-magnetic trips.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | HFJ437125 |
| Series | HFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 22kA @ 480VAC |
| Frame Type | HFJ-7 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Panels and Switchgear |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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 | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
7 answersWhat equipment is the HFJ437125 designed to fit?
This breaker is designed for use with legacy Federal Pacific panels and switchgear that accept H-frame or HFJ-7 frame molded case circuit breakers.
What wire sizes are accepted by the lugs on this breaker?
The factory lugs accommodate wire gauges from 4 AWG up to 350 kcmil. Ensure your conductors fall within this range for proper termination.
Can this 480V breaker be used on 240V systems?
Yes, the HFJ437125 can be applied to 240VAC systems, where it provides a higher interrupting capacity of 65kAIC compared to its 22kAIC rating at 480VAC.
How does the HFJ437125 mount into the panel?
It utilizes a bolt-on connection, requiring secure mechanical fastening directly to the panel busbars rather than a plug-in or snap-in installation.
Are the trip settings on the HFJ437125 adjustable?
No. It features a fixed thermal magnetic trip unit with Long-Time and Instantaneous (LI) functions. Both the thermal and magnetic trip points are factory set and cannot be adjusted in the field.
Are there direct modern replacements for Federal Pacific HFJ breakers?
Because Federal Pacific is no longer manufacturing new breakers, exact replacements are typically sourced as legacy stock. Retrofit kits or complete panel upgrades are often required if a direct HFJ-7 frame replacement cannot be sourced.
Does this breaker have the same safety concerns as Federal Pacific Stab-Lok breakers?
No. The HFJ437125 is a commercial grade molded case circuit breaker with a bolt-on connection. The well known safety issues associated with Federal Pacific generally apply to their residential Stab-Lok plug-on load centers and breakers, not their heavy duty industrial H-frame breakers.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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1 review
- JMJimmy M.Verified BuyerReviewingFederal Pacific HFJ631225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/9/26FPE HFJ631225
Super Breakers always comes through for me. Had a customer who’s sub breaker feeding the office went out and Rick with Super Breakers was very helpful finding the exact replacement.
I recommend them to anyone.