Eaton / Westinghouse FB2125 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Eaton / Westinghouse
FB2125
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
FB2125
Quantity
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Eaton / Westinghouse FB2125 - 125A 2 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial applications, the Eaton FB2125 is a 125A, two-pole molded case circuit breaker. It provides essential long-time and instantaneous protection for 600VAC systems using a thermal-magnetic trip mechanism. Designed to keep legacy infrastructure operational, this F-Frame breaker installs into Westinghouse CDP and FDP panelboards. It acts as a direct substitute for hard-to-find FDB2125 and FD2125 breakers. The unit features an 18kAIC rating at 240VAC.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Series | FB |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | FB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse CDP Panelboards, FDP Panelboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 4/0 AWG (Al/Cu) |
| Max Wire | 4/0 AWG |
| 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 | Load Side Lugs Included |
| Standards | NEMA AB-1, UL 489, W-C-375b |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | 2-Pole in 3-Pole Housing |
Product FAQs
6 answersWhich panelboards are compatible with the FB2125 circuit breaker?
This F-Frame breaker is designed for installation in legacy Westinghouse CDP and FDP panelboards, as well as compatible Motor Control Centers.
What type of wire can be used with the FB2125 lugs?
The factory lugs are rated for dual-rated aluminum and copper (Al/Cu) conductors, accommodating wire sizes from 4 AWG up to 4/0 AWG.
Can the FB2125 be utilized in direct current systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications, providing a 10kA interrupting capacity for DC circuits.
Are the thermal and magnetic trip points adjustable on this breaker?
No, the FB2125 features fixed long-time (thermal) and fixed instantaneous (magnetic) trip functions, meaning the trip curve cannot be field-adjusted.
Is the Westinghouse FB2125 still in active production?
The original Westinghouse FB line is a legacy series. Eaton, which acquired the Cutler-Hammer and Westinghouse distribution equipment lines, manages the modern F-Frame replacements.
Does the FB2125 provide both overload and short-circuit protection?
Yes, the thermal-magnetic trip unit provides long-time protection for standard overloads and instantaneous protection for short-circuit faults.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- SDSal D.Verified BuyerReviewingEaton / Cutler-Hammer FB3125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/16/26Breakers
Really happy with the breakers and with the quickness they were delivered
- CBChristopher B.ReviewingEaton / Cutler-Hammer FB3015L - 15A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/8/20AWESOME JOB
Quick response and delivery. Exactly what I wanted.