Square D LA I-Line Thermal-Mag...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6,721.60
Square D LA I-Line Thermal-Magnetic Circuit Breaker, 3-Pole, 350A, 600VAC

Square D LA I-Line Thermal-Magnetic Circuit Breaker, 3-Pole, 350A, 600VAC

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Model: LA36350

In Stock (leaves warehouse same day if ordered before 3pm ET)

$6,721.60
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Square D LA I-Line Thermal-Magnetic Circuit Breaker, 3-Pole, 350A, 600VAC

The Square D LA I-Line circuit breaker is a thermal-magnetic molded-case breaker engineered for use in I-Line power distribution panelboards on both AC and DC systems. Rated 350A with a 3-pole, 3-wire configuration, this breaker delivers 600VAC/22kA and 250VDC/10kA interrupt ratings for dependable overload and short-circuit protection in commercial and industrial applications. It is cULus Listed (File E33139), certifying compliance with both UL and CSA standards, and features an I-Line line-side connection with load-side lugs for fast, secure unit-mount installation.

Key Features

  • Amperage Rating: 350A trip rating provides robust overload and short-circuit protection for I-Line panelboard circuits.
  • Trip Unit Technology: Thermal-magnetic trip mechanism combines thermal overload sensing with instantaneous magnetic tripping for reliable fault response.
  • Poles: 3-pole (3P) design with 3-wire configuration for 3-phase distribution systems.
  • Dual Voltage Rating: Rated 600VAC and 250VDC, allowing use on both AC and DC power distribution systems.
  • Interrupt Capacity: 22kA AC and 10kA DC short-circuit interrupt ratings for demanding fault conditions.
  • Magnetic Tripping Current: 3500-3500 A magnetic trip range with a 1750A magnetic hold current for precise fault clearing.
  • Electrical Connection: I-Line connection on the line side and lugs on the load side, built for unit-mount I-Line panelboard construction.
  • Mercury-Free Construction: Manufactured without mercury and with halogen-free plastic components.

Certifications & Compliance

  • cULus Listed – compliance to UL and CSA standards, File E33139
  • UL Listed
  • CSA Certified
  • Mercury Free

Technical Specifications

  • Warranty: 18 months
  • Poles Description: 3P
  • Magnetic Tripping Current: 3500-3500 A
  • Trip Unit Technology: thermal-magnetic
  • Mercury Free: Yes
  • Sustainable Packaging: Yes
  • Packaging Without Single Use Plastic: Yes
  • With Recycled Cardboard: Yes
  • ROHS Eur In Scope: Yes

Typical Applications

  • Commercial and Industrial Power Distribution Panelboards
  • I-Line Unit-Mount Panelboard Systems
  • AC and DC Electrical Distribution Systems
  • Overload and Short-Circuit Circuit Protection
  • New Construction and Panelboard Retrofit Projects

Why Square D?

Square D LA I-Line circuit breakers are built for professional electrical work where code-compliant reliability matters. With cULus Listing under File E33139, mercury-free construction, and a dependable thermal-magnetic trip mechanism backed by an 18-month warranty, this breaker is engineered to protect I-Line power distribution panelboards on both AC and DC systems.

Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Series:
LA
Amperage Rating:
350A
Voltage Rating:
600VAC
Configuration:
3-Pole
Listing:
cULus
Standards:
UL-CSA
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Width:
6 in
Product Height:
11 in
Product Depth:
5.84 in

Square D LA36350 – Frequently Asked Questions

1) Will a Square D LA36350 breaker mount in any panelboard, or only an I-Line panel?
The LA36350 is built for I-Line unit-mount construction only. Its line side is an I-Line jaw-type connection that bolts onto the I-Line bus stabs, with lugs on the load side for field wiring. It will not mount in a bolt-on or plug-on branch panel. If your panel is not an I-Line panelboard, this is the wrong frame.
2) Can the Square D LA 350A breaker be used on a DC system, not just 600V AC?
Yes, it is dual rated. 600VAC with 22kA interrupting, and 250VDC with 10kA interrupting, so it can protect DC distribution as well as 3-phase AC. For DC applications above 250V, this frame does not apply.
3) Is 22kA enough interrupting capacity for my 480V service?
The LA36350 carries a 22kA AC interrupting rating at 600VAC. Compare that against the available fault current at the point of installation from your coordination or short-circuit study. If your calculated available fault current at that bus exceeds 22kA, you need a higher-AIC frame or series-rated combination, not this breaker.
4) What other brands of 3-pole molded case breaker could I use instead of the Square D LA?
Among other molded-case 3-pole breakers we carry, there is the ABB A2A150TT in the A2 Series, ABB XT4 and XT5 3-pole kits, and the Eaton Series C K-Frame 400A 3-pole with an interchangeable rating plug. Important caveat: none of those are I-Line connection breakers. The LA is a jaw-mount I-Line unit, so if you are replacing a breaker inside an existing I-Line panelboard, a different manufacturer's frame will not land on that bus. Cross-brand options only make sense when you are specifying a new enclosure or individually mounted breaker.
5) Is the Eaton BAB-302 Quicklag a substitute for the Square D LA36350?
They serve different parts of a system. The Eaton BAB-302 Quicklag is a three-pole thermal-magnetic breaker rated 240V, while the Square D LA36350 is rated 600VAC and 250VDC at 350A for I-Line power distribution panelboards. Both use a thermal-magnetic trip, but the BAB-302 at 240V cannot be applied on a 480V or 600V distribution system where the LA36350 is used. The bolt-on BAB1010 is likewise a branch-circuit Quicklag device rather than a distribution frame breaker.
6) Can an ABB A2A150TT molded case breaker be used in place of the Square D LA36350?
No. The Square D LA36350 is an LA-series I-Line breaker with an I-Line line-side connection designed to plug into Square D I-Line unit-mount panelboard bus, so the mounting interface is specific to that panelboard. The ABB A2A150TT is an A2-series 3-pole molded case breaker and mounts to ABB's own frame arrangement, not to I-Line bus. Both are 3-pole molded case devices, but only the LA36350 drops into an I-Line panelboard interior.
7) What 3-pole breaker should I look at if I need a 400A frame instead of 350A?
The Square D LA36350 is fixed at a 350A trip rating in a 3-pole configuration. If the calculation lands at 400A, the Eaton Series C K-Frame mining circuit breaker is a 400A 3-pole molded case device with an interchangeable rating plug, which also lets the trip rating be adjusted by changing the plug rather than the breaker. Note it is a K-Frame breaker, not an I-Line unit-mount device, so it does not plug onto I-Line bus.
8) What is the magnetic trip setting on the Square D LA36350, and is it adjustable?
It is a thermal-magnetic trip unit with a fixed magnetic trip of 3500A (listed as a 3500-3500 A range, so there is no adjustable band) and a 1750A magnetic hold current. Thermal overload sensing handles sustained overloads; the magnetic element clears short circuits instantaneously. If you need an adjustable instantaneous setting for motor-load coordination, specify an electronic trip frame instead.
9) How much space does the Square D LA 3-pole 350A breaker take up in the panel?
Published dimensions are 11 in height, 6 in width, and 5.84 in depth. Check that against the remaining unit space in the I-Line interior and the gutter depth behind the deadfront before you order.
10) Does the LA36350 work on a 3-phase 4-wire system, or do I need a different breaker?
It is a 3-pole, 3-wire breaker, so it switches and protects the three phase conductors. On a 3-phase 4-wire system the neutral is not switched by the breaker; it lands on the panel neutral bus. For an application that requires the neutral to be opened, this configuration will not do it.
11) What exact part number do I order for the Square D LA 350A 3-pole I-Line breaker?
Order Square D LA36350. That is the single model in the LA series configuration rated 350A, 3-pole, 600VAC, with I-Line line-side connection and load-side lugs.
12) We need a smaller supplementary protector for a control panel, not a 350A distribution breaker. What is the alternative?
The Square D LA36350 is a 350A molded case breaker built for I-Line power distribution panelboards and is far larger than a control-panel device at 11 inches high, 6 inches wide and 5.84 inches deep. For DIN-rail supplementary protection, the ABB ST200M series miniature circuit breaker with a C-curve, listed to UL1077, is the device class to look at instead. UL1077 supplementary protectors are not branch-circuit protective devices, so they do not replace the LA36350's role.
13) Does the Square D LA36350 accept an undervoltage release accessory like the Eaton NZM breakers do?
The Eaton 10250T-GR is an undervoltage release accessory specific to the Eaton NZM series molded case breakers and will not fit a Square D LA frame. The LA36350 is a thermal-magnetic LA-series I-Line breaker; specify Square D LA-frame accessories for any shunt or undervoltage trip rather than cross-brand releases.
14) What is the difference between the Square D LA36350 and the ABB XT4 and XT5 breaker kits?
The ABB MBB33 is an XT4-series 3-pole molded case breaker kit and the MBM334 is an XT5-series 3-pole kit, both supplied as kits within ABB's XT platform. The Square D LA36350 is an individual LA-series 350A, 3-pole breaker with an I-Line line-side connection and load-side lugs for unit-mount installation in a Square D I-Line panelboard. Choose by the enclosure or panelboard already in place, since the connection method is what decides fit.
15) Does this breaker meet green building or sustainable procurement requirements?
For specs with environmental criteria, the LA I-Line breaker is built mercury-free with halogen-free plastic components and is in scope for European RoHS. Packaging is recycled cardboard with no single-use plastic. Those are the points a sustainability-driven procurement team usually has to document.
16) Do the Bussmann CBC and CBF breakers overlap at all with the Square D LA36350?
No. The Bussmann CBC series is a Type I automotive circuit breaker rated 14VDC, and the CBF series is a Type II automotive breaker; the CBC-B adds a waterproof stud terminal for the same automotive duty. The Square D LA36350 is a 600VAC/250VDC, 350A, 3-pole molded case breaker for commercial and industrial panelboards. The two families share no application, voltage class, or mounting.
How fast can I get the Square D LA36350 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D LA36350 come with a warranty?
Absolutely. The Square D LA36350 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D LA36350?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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