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Eaton / Westinghouse LA3100PR Molded Case Circuit Breaker
- 100A
- 3 Pole
- Unit Mount
Eaton / Westinghouse
LA3100PR
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LA3100PR
Quantity
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Eaton / Westinghouse LA3100PR - 100A 3 Pole Molded Case Circuit Breaker
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Description
Delivering exceptional short-circuit protection, the LA3100PR is a 100A, 3-pole current limiting molded case circuit breaker. It utilizes a thermal-magnetic trip unit with fixed thermal and adjustable magnetic settings for precise control. Designed for legacy applications, this breaker mounts into older Westinghouse panelboards and motor control centers. It ensures seamless integration for facilities maintaining older L-frame equipment. It features an impressive 200kAIC rating at 600VAC.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LA3100PR-R |
| Series | LA |
| Amperage | 100A |
| 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
5 answersWhat panelboards are compatible with the LA3100PR circuit breaker?
The LA3100PR is a bolt-on, unit-mount L-frame breaker designed for legacy Westinghouse panelboards and high-AIC switchboards. It is also compatible with older Cutler-Hammer and Eaton L-frame distribution equipment.
What wire sizes and materials are accepted by the LA3100PR lugs?
The standard lugs accept either a single 1 AWG to 600 kcmil conductor or dual 1 AWG to 250 kcmil conductors per phase. The terminals are rated for both aluminum and copper wiring, making the dual-wire option ideal for parallel runs.
How does the adjustable magnetic trip work on the LA3100PR?
The breaker uses a thermal-magnetic trip unit with a fixed thermal element for 100A continuous overload protection. The instantaneous magnetic trip is adjustable, allowing electricians to fine-tune the short-circuit response to coordinate with downstream devices or handle motor inrush currents without nuisance tripping.
What does the PR suffix indicate on the LA3100PR breaker?
The PR suffix designates this as a Westinghouse Tri-Pac current-limiting circuit breaker. It utilizes internal current limiters to achieve a massive 200kAIC interrupting capacity at 480VAC, providing ultra-fast clearing of severe short circuits to protect downstream equipment.
Is the Westinghouse LA3100PR still in active production?
No, the original Westinghouse LA-frame series is a legacy product and is no longer manufactured. However, exact replacements are available to maintain existing panelboards and switchboards without requiring a complete system retrofit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
Total 5 star reviews: 13 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
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?