Eaton / Westinghouse LA3125PR Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Eaton / Westinghouse LA3125PR - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for extreme fault conditions, the 125-amp Eaton LA3125PR utilizes a fused Tri-Pac design to deliver superior current-limiting performance. Designed to support aging infrastructure, this 3-pole breaker fits seamlessly into legacy Westinghouse panelboards. It provides a reliable, exact-fit solution without the need for retrofit kits. With a 200kAIC rating at 600VAC, it restricts let-through current during short circuits, safeguarding sensitive downstream components.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LA3125PR-R |
| Series | LA |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 200kA @ 600VAC, 100kA @ 250VDC |
| Frame Type | LA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Switchboards (High AIC) |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 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 Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Fused, Interchangeable Trip Unit |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
7 answersWhat does the PR suffix indicate on the LA3125PR catalog number?
The PR suffix designates this as a Westinghouse Tri-Pac current-limiting circuit breaker. It utilizes an integrated fused design to achieve a high interrupting rating of 200kAIC at 480V, which is significantly higher than standard LA frame breakers.
Which panelboards accept the LA3125PR circuit breaker?
This legacy L-Frame breaker is designed for direct installation into older Westinghouse and Cutler-Hammer panelboards and switchboards requiring high-AIC protection. It serves as an exact physical replacement, preventing the need for retrofit adapter kits.
How is the LA3125PR mounted inside the enclosure?
This is a unit-mount breaker that utilizes a bolt-on connection. It fastens directly to the chassis of compatible Westinghouse switchboards and panelboards.
What are the wire size limits for the LA3125PR lugs?
The standard lugs accommodate either a single conductor from 1 AWG to 600 kcmil or dual conductors from 1 AWG to 250 kcmil. Both aluminum and copper wire are supported.
Can a modern Eaton JD frame breaker replace the LA3125PR?
While modern Eaton JD frame breakers offer similar 125A ratings, they have different physical dimensions. Installing the exact LA3125PR replacement avoids the downtime and labor required to modify the buswork or install aftermarket adapter kits.
How does the LI trip unit function on this breaker?
The LI designation indicates a thermal-magnetic trip unit equipped with Long-Time and Instantaneous protection. The thermal overload protection is fixed, while the magnetic short-circuit response is adjustable to coordinate with other devices in the system.
Can the LA3125PR be used in DC electrical systems?
Yes, this breaker is rated for use on 250VDC systems. It provides an interrupting capacity of 100kAIC for direct current applications.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
- RGRobert G.Verified BuyerReviewingSquare D LA36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/16/26LA36400
Perfectly boxed and arrived on time. Thanks for the shirt and stickers as well.
- CECraig E.Verified BuyerReviewingEaton / Cutler-Hammer LA3600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/13/25Westinghouse breaker
Excellent customer service and quick shipping
- CLClifton L.Verified BuyerReviewingSquare D LA36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/30/25estimator
Good
- BCBenjamin C.Verified BuyerReviewingEaton / Cutler-Hammer LA3225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Refurbished Breaker
Breaker seems to be working great, no complaints from Client
- JMJerry M.ReviewingEaton / Cutler-Hammer LA3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/14/23Where is my breaker?
Where is my breaker?