Square D LA26350AC Molded Case Circuit Breaker
- 350A
- 2 Pole
- I-Line
Quantity
Square D LA26350AC - 350A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Delivering high-capacity overcurrent defense, the Square D LA26350AC is a 2-pole, 350A molded case circuit breaker. It provides essential long-time and instantaneous (LI) protection for industrial applications. Designed for compatibility, it installs into Square D I-Line panelboards. As a legacy L-Frame breaker, it can be replaced by the PowerPacT LJA36350U31X series. Factory-configured for an AC phase connection, it boasts a 42kA rating at 240VAC and includes an adjustable magnetic trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | LA26350AC |
| Series | LA |
| Amperage | 350A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Phase Connection AC |
Product FAQs
7 answersWhat does the "AC" suffix indicate on the LA26350AC catalog number?
The "AC" suffix specifies the phase connection for this 2-pole breaker. It is configured to connect to the A and C phases on a 3-phase Square D I-Line bus.
Can I use parallel conductors for the load connections on this breaker?
Yes, the factory lugs on the LA26350AC accommodate parallel runs. You can terminate two 1 AWG to 250 kcmil conductors (aluminum or copper) per phase, or use a single 1 AWG to 600 kcmil conductor.
How does the adjustable magnetic trip work on the LA26350AC?
While the thermal overload protection is fixed at 350 amps, the magnetic instantaneous trip is adjustable. This allows electricians to fine-tune the short-circuit response threshold for proper selective coordination with downstream devices.
Is the LA26350AC suitable for DC power systems?
Yes, this breaker is rated for use in 250VDC applications, providing a 10kA interrupting rating for industrial DC control, battery, or solar systems.
Will this breaker fit in a standard Square D NQ or NF panelboard?
No, the LA26350AC features an I-Line plug-in connection and is exclusively designed for Square D I-Line panelboards and switchboards. It will not fit in NQ, NF, or QO load centers.
Can the LA26350AC be used to replace older Square D L-Frame breakers?
Yes, this breaker is part of the legacy LA frame family. It will directly replace older 350A 2-pole LA breakers with an AC phase configuration in existing I-Line panels without requiring bus modifications.
Does the LA26350AC include a push-to-trip feature?
Yes, Square D LA frame breakers feature a push-to-trip button. This allows you to manually trip the breaker to verify the mechanical operation of the tripping mechanism without exposing personnel to live parts.
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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?