LJA36400U31X - Square D 400A 600VAC 3 Pole Molded Case Circuit Breaker I-Line Plug-In L-Frame

Product Overview

The LJA36400U31X is a Square D L‑frame molded case circuit breaker rated 400 amps at 600 VAC, configured as a 3‑pole device with I‑Line plug‑in mounting.

This listing covers the single SKU LJA36400U31X. Request a quote for pricing and to confirm compatibility and quantity requirements.

Key Features

• Manufacturer: Square D
• SKU/Model: LJA36400U31X
• Frame type: L‑frame (molded case circuit breaker)
• Ampacity: 400 A
• Voltage rating: 600 VAC
• Poles: 3 (three‑pole)
• Mounting: I‑Line plug‑in

What this breaker is for

The LJA36400U31X is a molded case circuit breaker designed to provide overcurrent protection and switching for three‑phase electrical systems. Its three‑pole configuration protects all three phases simultaneously.

• Suitable for use where a 400 A, 3‑pole protective device is required
• Intended for panel or distribution applications that accept I‑Line plug‑in breakers

Electrical ratings and capacity

Use this model where the system voltage does not exceed 600 VAC and a 400 A breaker is specified. These ratings describe the electrical capacity of this exact SKU.

• Ampacity: 400 A
• Maximum voltage: 600 VAC
• Poles: 3

Mounting and physical configuration

The LJA36400U31X uses an I‑Line plug‑in mounting arrangement and is classified as an L‑frame molded case circuit breaker. Confirm the panel or frame accepts I‑Line plug‑in L‑frame breakers before specifying this SKU.

• Mounting: I‑Line plug‑in
• Frame: L‑frame (molded case)

Ordering checks

Confirm the model number and quantity required before ordering. Verify panel compatibility, required trip unit or accessory options separately, and that the 400 A/600 VAC ratings match your application.

• Confirm model: LJA36400U31X
• Verify panel accepts I‑Line plug‑in L‑frame breakers
• Specify any required accessories or trip settings in a separate request

Before You Order

Confirm the exact model number and the quantity you require. Verify that your distribution panel or enclosure accepts I‑Line plug‑in L‑frame breakers and that a 400 A, 600 VAC, 3‑pole breaker is appropriate for your installation.

• Confirm compatibility with the panel or switchboard (I‑Line plug‑in acceptance)
• Specify any required trip unit, shunt trip, auxiliary contacts, or other accessories separately
• Contact a qualified electrical professional to confirm selection and installation requirements

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for LJA36400U31X - Square D 400A 600VAC 3 Pole Molded Case Circuit Breaker I-Line Plug-In L-Frame. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.