Eaton / Cutler-Hammer FB4100 Molded Case Circuit Breaker
- 100A
- 4 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer FB4100 - 100A 4 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating as a critical safety component, the Eaton FB4100 is a 100-amp, 4-pole molded case circuit breaker. It relies on fixed thermal and magnetic trip elements to provide reliable long-time and instantaneous fault protection. This legacy breaker features a bolt-on configuration for stable installation in Cutler-Hammer and Westinghouse Pow-R-Line C panelboards and MCCs. Facilities looking for current equivalents can cross-reference the FD4100. It offers 14kAIC at 480VAC and load side lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | FB4100-R |
| Series | FB |
| Amperage | 100A |
| Poles | 4 |
| Mounting Style | Bolt-On |
| 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 | Load Side Lugs Included |
| Standards | NEMA AB-1, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Common Trip |
Product FAQs
4 answersWhich panelboards are compatible with the FB4100 circuit breaker?
The FB4100 is an F-frame breaker designed for bolt-on installation in legacy and current Westinghouse or Cutler-Hammer distribution equipment, specifically Pow-R-Line C and FDP panelboards, as well as compatible switchboards and motor control centers.
Can the Eaton FB4100 replace older Westinghouse FB breakers?
Yes. Because Eaton acquired the Cutler-Hammer and Westinghouse distribution equipment lines, the FB4100 serves as a direct replacement for legacy Westinghouse and Cutler-Hammer FB-frame breakers with matching specifications.
What is the purpose of the fourth pole on this 3-phase breaker?
In a 3-phase, 4-wire system, the fourth pole is typically utilized to switch or isolate the neutral conductor. This is required in specific installations where complete isolation of all grounded and ungrounded conductors is necessary for safety or system design.
How does the LI thermal magnetic trip unit operate on the FB4100?
The LI designation indicates two forms of protection. It uses a fixed thermal element (Long-Time) that responds to gradual overloads by heating a bimetallic strip, and a fixed magnetic element (Instantaneous) that responds immediately to severe short circuits.
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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.