Square D | LLA36000S40X | Circuit Breaker | 400A | 3-Pole | 600V

Square D LLA36000S40X Circuit Breaker — 400A, 3-Pole, 600V

Meet a dependable 400-amp, three-pole circuit breaker designed for 600-volt service. The LLA36000S40X is a practical choice for maintenance, retrofit, and replacement projects where precise specifications matter and downtime is costly. Built to integrate with compatible Square D panel systems, this device delivers robust protection for demanding 3-phase applications.

• Amperage: 400 A
• Poles: 3-Pole
• Voltage: 600 V
• Part reference: LLA36000S40X

Compatibility notes: Confirm fit and ratings before ordering. The part number is the best reference to ensure the breaker matches your panel and bus configuration, reducing the risk of installation issues or performance mismatches.

Why this Square D breaker is a smart choice

As a Square D device, this breaker is designed for reliability within 600V three‑phase systems and is suited for environments where high-current protection is essential. Its 400A rating and 3‑pole configuration make it ideal for protecting heavy machinery, motors, and other high-load equipment in industrial and commercial settings, while fitting into standard Square D panel architectures for streamlined replacement or retrofits.

Ideal use cases

• Maintenance and retrofit projects that require exact 400A, 3-Pole, 600V specifications.
• Replacement of a failed breaker with a matching part number to restore panel protection quickly.
• Upgrading or refurbishing 3-phase electrical systems in manufacturing, processing, or large facilities.

Practical tips for a smooth purchase and install

• Double-check your panel labeling to verify compatibility with 400A, 3-Pole, 600V devices and confirm that the LLA36000S40X is the correct reference for your setup.
• Keep the exact part number handy during ordering to ensure a precise match and reliable performance.
• Follow standard safety practices when handling high-current components and comply with local electrical codes during installation.

Designed for professionals who demand exact specifications and dependable protection, the Square D LLA36000S40X is a focused solution for maintaining, retrofitting, or replacing critical 600V, three-phase circuits. Add it to your project with confidence, knowing you’re using a part that aligns with your panel’s design and safety standards.