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Manufacturer Resources
Spec Sheet
Product Specs
- Amperage Rating:
- 400A
- Circuit Breaker Type:
- LA
- Interrupt Rating:
- 200 kAIC at 600 Vac, 100 kAIC at 250 Vdc
- Line:
- Pressure
- Magnetic Trip Range:
- 2000-4000A
- Number Of Poles:
- Three-pole
- Terminal Material:
- Copper
- Terminals:
- Line and load
- Trip Type:
- Interchangeable thermal-magnetic
- Voltage Rating:
- 600 Vac, 250 Vdc
- Department:
- Electrical
- Product Group:
- Racks & Frames
- Product Subgroup:
- Frames
- Product Type:
- Frame only
- Product Length:
- 18.5 IN
- Product Details:
- Frame only
- Product Height:
- 8.3 IN
- Product Weight:
- 24.2 LB
- Product Width:
- 10.5 IN
B-LINE LA3400PRF – Frequently Asked Questions
1) Will a 400A LA-frame breaker hold up on a service with high available fault current?
Interrupting rating on the LA3400PRF is 200 kAIC at 600 Vac and 100 kAIC at 250 Vdc, which covers most high-fault commercial and industrial services without a current-limiting fuse ahead of it. Compare that number against the available fault current your engineer calculated at the point of installation.
2) Can the trip setting on this Eaton LA 400A breaker be adjusted in the field?
Yes. It uses an interchangeable thermal-magnetic trip unit with a magnetic trip range of 2000-4000A, so the instantaneous pickup can be dialed within that band to coordinate with downstream devices. Because the trip is interchangeable rather than fixed, the trip unit itself can also be swapped to change the ampere rating within the LA frame.
3) How much space do I need in the gear for a 400A Eaton LA frame breaker?
Plan for a device measuring 18.5 in long, 10.5 in wide and 8.3 in high, weighing 24.2 lb. At that weight, a 400A LA frame is a two-hand lift into a panel and usually wants a mounting base or bracket kit in the enclosure rather than being hung off the conductors.
4) I need to replace an existing Eaton LA-frame 400A breaker in a panelboard. Is this the right part number to order?
For a 400A three-pole LA frame with copper pressure line and load terminals, LA3400PRF is the part number to match. Check the nameplate on the breaker you are pulling for the same LA prefix and pole count, and confirm your panel's interrupting requirement is at or below 200 kAIC at 600 Vac.
5) What kind of lugs come on the LA3400PRF, and can I land aluminum conductors?
Line and load terminals are both supplied, and they are copper pressure-type terminals. Copper terminals of this type are commonly rated for copper or aluminum conductors, so confirm the AL/CU marking on the actual terminal before landing aluminum feeders.
6) Does LA3400PRF come as a complete breaker or do I have to buy the trip unit separately?
It ships as a complete molded case circuit breaker in the LA frame, with line and load terminals included. The "frame only" designation refers to the LA frame size, not to a bare housing, and the amperage is already set at 400A with a 2000-4000A magnetic trip range.
7) Can I use this 400A breaker for a single-phase or two-pole application?
It is built as a three-pole device. For a two-pole or single-pole application you want an LA-frame breaker ordered in that pole configuration instead; using two poles of a three-pole breaker is not how these are listed.
8) Is there a spec sheet available for the Eaton LA3400PRF?
Yes, Eaton publishes a spec sheet for LA3400PRF and it is linked from the product information. It is the document to hand your inspector or engineer for the trip curve and terminal wire ranges.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the B-LINE LA3400PRF come with a warranty?
Absolutely. The B-LINE LA3400PRF is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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