Eaton / Westinghouse FA3100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Quantity
Eaton / Westinghouse FA3100 - 100A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy-duty industrial environments, this 100A three-pole breaker utilizes proven thermal-magnetic trip technology for consistent performance. It integrates seamlessly into existing Westinghouse motor control centers, switchboards, and Eaton Pow-R-Line C panelboards. Equipped with advanced AB De-Ion arc quenching capabilities, it safely interrupts faults up to 14kA at 480VAC. This unit is an ideal drop-in solution for aging infrastructure, easily cross-referencing to the FD3100.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | FA3100 |
| Series | FA |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | FA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Motor Control Centers, Switchboards, Eaton Pow-R-Line C Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 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 | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | AB De-Ion Arc Quenching |
Product FAQs
6 answersWhat panels and enclosures are compatible with the FA3100 circuit breaker?
The FA3100 is designed for use in legacy Westinghouse panelboards, motor control centers, and switchboards, as well as Eaton Pow-R-Line C panelboards.
Are lugs included with the FA3100, and what wire sizes do they accept?
Yes, the FA3100 comes equipped with lugs that accept 14 AWG to 1/0 AWG copper or aluminum wire.
Can the FA3100 be used in DC power systems?
Yes, this breaker is rated for up to 250VDC with a 10kA interrupting capacity, in addition to its standard AC voltage ratings.
Is the Westinghouse FA3100 an obsolete breaker?
Yes, the FA frame is a legacy Westinghouse design now managed under the Eaton and Cutler-Hammer brands. It is commonly sourced to maintain existing panels without requiring a complete retrofit.
Can the FA3100 replace other Westinghouse F-frame breakers?
Yes, the FA3100 shares the same physical footprint as other legacy F-frame breakers and can often serve as a direct drop-in substitute for FDB3100 and FD3100 units in existing enclosures.
Does the FA3100 feature adjustable trip settings?
No, this breaker uses a thermal magnetic trip unit with fixed thermal and fixed magnetic settings for both long-time and instantaneous protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 70 reviews.
- CPCasey P.Verified BuyerReviewingSquare D FA34030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Great company
Ordered on a Saturday evening, paid for two day shipping and it arrived on time and in perfect condition. Would 100 percent be using this company going forward, beat out pricing and shipping times for all my local supply houses. Plus the staff were great to deal with.
- AHAnn H.Verified BuyerReviewingSquare D FA36100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/22/26Professional Service
So far, so good! The circuit breaker was installed along with a new compressor for our church AC, and everything is now working well.
The company has been professional, dependable, and reputable throughout the process. I had a question after the installation, and it was answered immediately. I also appreciated that they followed up and asked for feedback to make sure the new part was working properly and that we were satisfied with the service.
It’s refreshing to deal with a company that not only has quality products but also cares about its customers after the job is completed. I would definitely recommend them!
- RErene e.Verified BuyerReviewingSquare D FA34070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/14/26breaker
breaker was just as discribed
- BEBallentine E.Verified BuyerReviewingSquare D FA24060AC - 60A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/15/26Great
Accurate and on time.
- EBEdward B.Verified BuyerReviewingSquare D FA32100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26As good as new
The Square D FA32100 circuit breaker (refurbished) was as good as a new breaker, without exception. There was no wear and tear or any marks at all. It was basically new. It is an excellent choice and a great product without having to pay the cost of a new breaker.