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SQUARE D Molded Case Circuit Breaker: 400 A Amps, 42kA at 120/240V AC, Instantaneous - Square D Molded Case Circuit Breakers for I-Line Panelboards
SQUARE DSquare D Molded Case Circuit Breakers for I-Line Panelboards

SQUARE D Molded Case Circuit Breaker: 400 A Amps, 42kA at 120/240V AC, Instantaneous

The Square D LA36400 is a 400 A molded case circuit breaker for I-Line panelboards, featuring 3 poles, a 42kA AIR rating at 120/240V AC, and an instantaneous trip mechanism. It uses lug terminals and ABC phase…

SKU 3G-OTH-609773

Brand
SQUARE D
Item
Molded Case Circuit Breaker: 400 A Amps, 42kA at 120/240V AC, Instantaneous
Category
Square D Molded Case Circuit Breakers for I-Line Panelboards
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Technical Specifications

SQUARE D
Manufacturer Part Number
LA36400
Series
LA
Type
42kA at 120/240V AC, Instantaneous, Lug, ABC, LA
Poles
3
Max. AIR Rating
42kA at 120/240V AC
Phase Connection
ABC
Instantaneous Trip
Instantaneous
Terminal Connection
Lug
View Full Spec Sheet

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SQUARE D Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Square D LA36400 is a 400 A molded case circuit breaker for I-Line panelboards, featuring 3 poles, a 42kA AIR rating at 120/240V AC, and an instantaneous trip mechanism. It uses lug terminals and ABC phase connection, part of the LA series.

Frequently Asked Questions

What is the Square D LA36400 molded case circuit breaker used for?

The Square D LA36400 is a 400 A molded case circuit breaker designed for I-Line panelboards in industrial and commercial power distribution systems. It provides overcurrent protection with an instantaneous trip mechanism, suitable for feeder and main breaker applications where high fault currents up to 42kA at 120/240V AC are expected.

What are the specifications of the Square D LA36400 circuit breaker?

The Square D LA36400 is a 3-pole, 400 A molded case circuit breaker with a 42kA AIR rating at 120/240V AC. It features an instantaneous trip, lug terminals, and ABC phase connection. It is part of the LA series and mounts in I-Line panelboards. The manufacturer part number is LA36400.

Where to buy the Square D LA36400 circuit breaker worldwide?

3G Electric supplies the Square D LA36400 molded case circuit breaker to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us to order this LA series breaker for your I-Line panelboard application.

How to select the correct Square D LA36400 circuit breaker for an I-Line panelboard?

To select the Square D LA36400, verify your panelboard accepts I-Line style breakers. Confirm the 400 A rating matches your load, the 42kA interrupting capacity at 120/240V AC exceeds available fault current, and the instantaneous trip suits your coordination study. Use lug terminals for cable connections and ABC phase labeling.

Used in

Common applications for SQUARE D
Commercial building electrical panels — Square D QO series plug-in circuit breakers for branch circuit protection
Industrial motor control centers — Square D QOB series bolt-on breakers in NQOD panelboards
Heating equipment installations — Square D QOU series unit-mount breakers for overcurrent protection
Outdoor electrical distribution — Square D L-Frame enclosures housing LAL/LHL breakers for 400 A service
Indoor facility power distribution — Square D Q-Frame enclosures with QBL/QDL breakers for 225 A circuits
Retrofit and replacement in existing Square D load centers — QO series breakers for 120/240V AC systems

SQUARE D Products

3G Electric supplies SQUARE D square d molded case circuit breakers for i-line panelboards. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Molded Case Circuit Breaker: 225 A Amps, 42kA at 120/240V AC, Adj, Lug, ABC, 3 Poles, 600V AC, LA (MPN LA36225). Key specifications — Terminal Connection: Lug; Phase Connection: ABC; Max. AIR Rating: 42kA at 120/240V AC; Instantaneous Trip: Adjustable; Series: LA.
Molded Case Circuit Breaker: 175 A Amps, 42kA at 120/240V AC, Adj, Lug, ABC, 3 Poles, 600V AC, LA (MPN LA36175). Key specifications — Terminal Connection: Lug; Phase Connection: ABC; Max. AIR Rating: 42kA at 120/240V AC; Instantaneous Trip: Adjustable; Series: LA.
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