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

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.