Cutler-Hammer / Westinghouse LA3400F Circuit (Frame Only)
- 400A
- 3 Pole
- Bolt-On
Quantity
Cutler-Hammer / Westinghouse LA3400F 3 Pole Circuit (Frame Only)
Re-Certified
Quantity
Description
LA3400F - Cutler-Hammer / Westinghouse Molded Case Circuit Breaker Frame Only
• Authentic Cutler-Hammer / Westinghouse Product
• Catalog Number: LA3400F
• Obsolete - Please Contact Representative for the trip unit
• 2-Year Warranty
• 400 Amp
• 600 Volt
• 3 Pole
• Circuit Breaker Frame Only
Specifications
| Brand | Cutler-Hammer / Westinghouse |
|---|---|
| Part Number | LA3400F-R |
| Series | LA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600 V |
| Phase | 3 |
| Approval | UL Listed |
|---|
Product FAQs
8 answersDoes the LA3400F include a trip unit?
No. The LA3400F is a circuit breaker frame only. An interchangeable thermal-magnetic trip unit must be installed for the breaker to function and provide overcurrent protection.
What type of trip units are compatible with the LA3400F frame?
This frame accepts LA-series interchangeable thermal-magnetic trip units. You must select a compatible trip unit with an amperage rating between 70A and 400A to match your specific circuit requirements.
What is the interrupting capacity (AIC) for the LA3400F frame?
When equipped with a standard trip unit, the LA frame provides an interrupting rating of 42 kA at 240V AC, 30 kA at 480V AC, 22 kA at 600V AC, and 20 kA at 250V DC.
Are mounting lugs included with this breaker frame?
No. Because this is a frame-only unit, terminal lugs are not included by default. Lugs must be sourced separately or may be included with the compatible trip unit depending on the exact configuration.
How does the LA3400F mount inside a panelboard?
The LA3400F is a bolt-on molded case circuit breaker frame designed for secure installation in compatible Westinghouse, Cutler-Hammer, or Eaton switchboards and panelboards.
Are Cutler-Hammer and Westinghouse LA3400F frames interchangeable?
Yes. Eaton acquired the Westinghouse distribution equipment line and continued manufacturing it under the Cutler-Hammer brand. The LA3400F catalog number is identical and interchangeable across these brands.
Is the LA3400F still actively manufactured?
No. The Cutler-Hammer and Westinghouse LA series is obsolete. While Eaton manufactures modern replacement options, exact retrofits using newer series breakers may require panel modifications.
Can I install a 400A trip unit if my circuit is only rated for 250A?
No. The installed trip unit must match the ampacity of the circuit conductors and the connected load to provide proper overcurrent protection, even though the frame itself can handle up to 400 amps.
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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?