Federal Pacific HFJ437100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Federal Pacific
HFJ437100
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
HFJ437100
Quantity
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Federal Pacific HFJ437100 - 100A 3 Pole Molded Case Circuit Breaker
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Description
Built to support aging infrastructure, the Federal Pacific HFJ437100 is a 100A, 3-pole molded case circuit breaker. It is designed for commercial facilities that still rely on classic FPE distribution equipment. As an exact cross-reference for the NFJ437100 and UBIHFJ3100, this bolt-on breaker fits seamlessly into Federal Pacific panelboards. Rated for 22kAIC at 480VAC, it utilizes fixed thermal and magnetic trip units (LI) to clear faults quickly. The breaker is also HACR rated.Specifications
| Brand | Federal Pacific |
|---|---|
| Series | HFJ |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 22kA @ 480VAC |
| 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 |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated |
Product FAQs
5 answersWhich panelboards are compatible with the Federal Pacific HFJ437100?
This bolt-on circuit breaker is designed specifically for legacy Federal Pacific Electric (FPE) panelboards and switchboards. It fits standard H-Frame slots, including CDP series panels configured for HFJ or NFJ frame breakers.
Can the HFJ437100 replace an NFJ-frame circuit breaker?
Yes. Federal Pacific HFJ-frame breakers share the same physical dimensions and mounting hardware as NFJ-frame breakers. The HFJ437100 can be used as a direct drop-in replacement for a 100A, 3-pole NFJ breaker (like the NFJ434100), offering a higher interrupting capacity.
What hardware is needed to mount the HFJ437100 in a CDP panelboard?
Installing this breaker into a Federal Pacific CDP panelboard requires a specific bus connection hardware kit. The aftermarket NFJ1K kit (which replaces the original OEM KCDP-3C kit) is commonly used to mount HFJ and NFJ frame breakers securely to the panel bus.
What wire gauge does the HFJ437100 accept?
The load-side lugs on this breaker are designed to accommodate wire sizes ranging from 4 AWG to 350 kcmil. Always verify that your conductor material and size comply with local electrical codes for a 100-amp circuit.
Is the Federal Pacific HFJ437100 suitable for new installations?
No. Federal Pacific Electric (FPE) is no longer in business, and their breakers are obsolete. The HFJ437100 is intended strictly as a direct replacement part to maintain and service existing legacy FPE electrical infrastructure, preventing the need for a full panel retrofit.
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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.