Square D LA400R 400A 3P 600V Circuit Breaker, NEMA 3R | AmpState

Introducing the Square D LA400R 400A 3P 600V Circuit Breaker, NEMA 3R — a purpose-built protection device designed for everyday electrical work in panelboards, load centers, and electrical distribution systems. When reliability and exact part matching matter, this Square D breaker stands out as a smart choice for maintenance teams, panel builders, and inventory managers who demand exact part compatibility.

• Ampacity and topology: 400 A, 3-pole configuration, designed for up to 600 V systems.
• Outdoor-ready protection: NEMA 3R enclosure rating supports outdoor or harsh environment installations.
• Exact fit: Direct part-number match—LA400R ensures you’re pulling the right piece, reducing risk of misfits and downtime.
• Convenient for stock and service: A dependable spare for service crews and panel builders who plan ahead with trusted Square D components.

Who benefits most? Electrical maintenance teams, facility engineers, and panel manufacturers who need consistent, code-compliant protection without guessing. Use it to safeguard feeders, branch circuits, and critical loads in industrial facilities, commercial buildings, and outdoor install sites where NEMA 3R protection is required.

Key specifications

• Manufacturer: Square D
• Part Number: LA400R
• Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Enclosure Rating: NEMA 3R

Availability note: This part is available from AmpState. If you need help matching a part number or confirming compatibility with your panel or distribution setup, message us and we’ll help you confirm the fit before you buy.