Eaton / Cutler-Hammer FB4050L Molded Case Circuit Breaker
- 50A
- 4 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer FB4050L - 50A 4 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for industrial applications, the Eaton FB4050L is a 4-pole, 50A molded case circuit breaker from the legacy F-Frame family. It provides dependable thermal-magnetic trip functions for robust system defense. This unit mount breaker integrates into Westinghouse and Cutler-Hammer Pow-R-Line C panelboards and motor control centers. It serves as a reliable replacement component, superseded by the FD4050. Rated 14kAIC at 480VAC, it features a non-interchangeable trip and reverse feed.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | FB4050L |
| Series | FB |
| Amperage | 50A |
| Poles | 4 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse / Cutler-Hammer Pow-R-Line C Panelboards, FDP Panelboards, Switchboards, Motor Control Centers |
| 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 | Line and Load Lugs |
| Standards | NEMA AB-1, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Reverse Feed, Non-Interchangeable Trip |
Product FAQs
7 answersWhich panelboards are compatible with the FB4050L circuit breaker?
This four-pole breaker is designed for use in Westinghouse and Cutler-Hammer Pow-R-Line C panelboards, FDP panelboards, switchboards, and motor control centers.
What wire sizes are accepted by the standard lugs on the FB4050L?
The standard line and load side lug terminals accept 14 AWG through 1/0 AWG copper or aluminum conductors.
What does the "L" suffix in the FB4050L catalog number indicate?
In Eaton and Cutler-Hammer F-Frame nomenclature, the "L" suffix indicates that the circuit breaker is supplied with both line and load side lug terminals installed.
Is the FB4050L rated for use in direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 250VDC with a maximum interrupting capacity of 10kA.
Does the FB4050L plug into the panelboard bus?
No, this is a unit mount circuit breaker. It does not plug in and must be hardwired or bolted directly to the chassis or mounting pan.
Are the trip settings adjustable on the FB4050L?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard Long-Time and Instantaneous (LI) protection without adjustable dials.
Is the FB4050L considered a legacy frame?
Yes, the FB series is part of the legacy F-Frame molded case circuit breaker family originally manufactured by Westinghouse and Cutler-Hammer, which is now under the Eaton brand.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.