Federal Pacific HFJ424150 Molded Case Circuit Breaker
- 150A
- 2 Pole
- Bolt-On
Quantity
Federal Pacific HFJ424150 - 150A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
The HFJ424150 is a 2-pole, 150A molded case circuit breaker from Federal Pacific's legacy H-Frame series. It provides reliable thermal-magnetic protection for commercial power distribution. Designed to install into Federal Pacific panelboards, this bolt-on unit ensures a seamless fit. It serves as the exact replacement for the obsolete NFJ424150. Rated for 65kAIC at 240V and 22kAIC at 480V, it safely clears severe faults. The breaker includes load-side lugs and is HACR rated.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | HFJ424150 |
| Series | HFJ |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 22kA @ 480VAC |
| Frame Type | HFJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Panelboards and Switchboards |
| 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, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated |
Product FAQs
7 answersCan I install the HFJ424150 in a modern Square D or Eaton panel?
No. The HFJ424150 is a legacy H-Frame breaker specifically designed for older Federal Pacific Electric (FPE) panelboards and switchboards. It is not interchangeable with modern Square D, Eaton, or Siemens panels.
What type of mounting hardware is required for the HFJ424150?
As a bolt-on molded case circuit breaker, it requires specific FPE mounting hardware kits, such as the NFJ1K for twin branch configurations in CDP panels, to properly secure the breaker to the busbar.
Are there direct replacements available for the discontinued FPE HFJ424150?
Yes. While Federal Pacific Electric is no longer in business, exact drop-in replacements are available to maintain existing FPE panelboards and switchboards without requiring a complete system upgrade.
Does the HFJ424150 offer adjustable trip settings?
No. This breaker features a fixed thermal-magnetic trip unit. Both the long-time and instantaneous protection functions are factory-set and cannot be adjusted in the field.
What wire sizes are compatible with the terminal lugs on the HFJ424150?
The standard lugs accept conductors ranging from 4 AWG up to 350 kcmil. Always verify the appropriate torque specifications when terminating the conductors to ensure a secure connection.
Is the HFJ424150 suitable for 480V three-phase systems?
The HFJ424150 is a 2-pole breaker, meaning it is designed for single-phase applications or across two phases of a three-phase system. It is rated for up to 480VAC, but it cannot protect all three legs of a three-phase circuit. For full three-phase protection, a 3-pole breaker is required.
Can the HFJ424150 be used in 240V applications?
Yes. While it has a maximum voltage rating of 480VAC, it is fully compatible with 240VAC systems. When used at 240VAC, the interrupting capacity increases to 65kAIC, compared to its 22kAIC rating at 480VAC.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.