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Eaton / Westinghouse LB3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
LB3125
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LB3125
Quantity
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Eaton / Westinghouse LB3125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy L-Frame family, this 125-amp molded case circuit breaker provides essential overcurrent protection for commercial facilities. It features an interchangeable trip unit with fixed thermal and adjustable magnetic functions. Engineered for seamless integration, the breaker installs into older Westinghouse switchboards and motor control centers. Choosing this exact match avoids the hassle of sourcing and installing the FD3125 adapter plate.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LB3125 |
| Series | LB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 20kA @ 250VDC |
| Frame Type | LB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | #6 AWG - 350 kcmil |
| Max Wire | 350 kcmil |
| Min Wire | #6 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
7 answersWhat equipment is the LB3125 designed to fit?
It is a legacy L-Frame breaker designed to bolt into older Westinghouse, Eaton, and Cutler-Hammer panelboards, switchboards, and motor control centers.
How does the adjustable magnetic trip function work on the LB3125?
While the thermal overload protection is fixed at 125 amps, the instantaneous magnetic trip can be adjusted. This allows panel builders to tune the short-circuit response to prevent nuisance tripping, which is especially useful in motor control applications.
Can the LB3125 be used in industrial DC control panels?
Yes. While commonly used in AC applications, this thermal-magnetic breaker is also rated for direct current systems up to 250VDC, making it suitable for battery backups and DC motor control circuits.
Is there a difference between the Eaton, Cutler-Hammer, and Westinghouse versions of the LB3125?
No. Eaton acquired the Westinghouse electrical distribution division in the 1990s. Breakers labeled under the Westinghouse, Cutler-Hammer, or Eaton brands with the LB3125 catalog number share the exact same L-Frame footprint and electrical characteristics.
What does the LB3125 catalog number indicate?
The LB prefix designates the legacy Westinghouse L-Frame family of molded case circuit breakers. The 3 indicates it is a 3-pole device, and 125 denotes the 125-amp continuous current rating.
Does the LB3125 come with lugs for wire termination?
Yes, this breaker includes standard mechanical lugs for terminating conductors. When installing, ensure the wire is within the accepted #6 AWG to 350 kcmil range and properly torqued to manufacturer specifications.
What are the safety requirements for installing a bolt-on L-Frame breaker?
Because the LB3125 bolts directly to the busbars, the entire panelboard or switchboard must be completely de-energized and properly locked out (LOTO) before installation. Only qualified electrical personnel should perform the installation or maintenance.
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Reviews
Review summary
Customers rate this product 4.5 out of 5 based on 2 reviews.
Total 5 star reviews: 1 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- KMKaren M.ReviewingEaton / Westinghouse LB3200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/29/22Great Resource
The website is easy to use and the shipping is very quick will continue to use SuperBreakers
- RRRashida R.ReviewingCutler-Hammer / Westinghouse LB3400F FrameI recommend this productRated 4 out of 5 stars6/18/17Purchase of CH LB3400F
Circuit breaker was shipped in very timely manner. Tracking # was correct.