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Federal Pacific NFJ437175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ437175
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ437175
Quantity
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Federal Pacific NFJ437175 - 175A 3 Pole Molded Case Circuit Breaker
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Description
Designed for commercial and industrial electrical systems, this 175A molded case breaker delivers robust overcurrent protection. It mounts into legacy Federal Pacific panelboards, offering an exact fit for aging infrastructure without requiring adapters. Featuring a fixed thermal-magnetic trip unit, the three-pole device handles 18kAIC at 480VAC and 25kAIC at 240VAC. This N-Frame component ensures continued operation of existing distribution setups.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ437175-R |
| Series | NFJ |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| 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, Fixed 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
7 answersWhat panelboards are compatible with the NFJ437175 circuit breaker?
This N-Frame breaker is designed exclusively for legacy Federal Pacific panelboards. It features a standard bolt-on connection for direct installation into existing enclosures without the need for retrofit adapters.
Can the NFJ437175 be used in 480V commercial systems?
Yes, this breaker is rated for up to 480VAC with an interrupting capacity of 18kA, making it suitable for standard commercial branch circuit protection. It is also rated for 250VDC applications with a 10kA interrupting capacity.
How does the NFJ437175 connect to the panelboard and load?
The breaker utilizes a bolt-on mounting style to secure directly to the bus of legacy Federal Pacific panelboards. The load side features factory-installed lug terminals that accept 4 AWG to 300 kcmil wire.
What is the difference between the frame amperage and trip amperage on this breaker?
The NFJ437175 is built on a 225A N-Frame, which dictates the physical size and maximum capacity of the breaker housing. However, it is factory-equipped with a fixed 175A thermal-magnetic trip unit to protect the specific circuit.
Is the NFJ437175 still manufactured by Federal Pacific?
No, this is an obsolete legacy circuit breaker. It serves as an exact replacement component for maintaining aging Federal Pacific distribution systems that require a 175A, 3-pole configuration.
Can the trip settings on the NFJ437175 be adjusted in the field?
No, this breaker is equipped with fixed thermal and fixed magnetic trip elements. The long-time and instantaneous trip functions cannot be adjusted.
What type of overcurrent protection does the NFJ437175 provide?
It features a non-interchangeable, fixed thermal-magnetic trip unit that delivers long-time and instantaneous (LI) protection against overloads and short circuits.
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Reviews
Review summary
Customers rate this product 4.7 out of 5 based on 3 reviews.
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Rating
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!
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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