Square D LA9D511 - Circuit Breaker | AmpState

Meet the Square D LA9D511 molded case circuit breaker—a dependable, compact protection device engineered for branch circuits in panelboards and loadcenters. Designed for residential, commercial, and light industrial environments, it delivers reliable overcurrent and short-circuit protection when and where you need it.

Why the Square D LA9D511 Stands Out

• Space-conscious molded case design that maximizes panel space and keeps your enclosure tidy, making room for essential circuits without sacrificing safety.
• Thermal-magnetic trip unit provides stable, repeatable protection across a range of loads, responding quickly to short circuits while avoiding nuisance trips from minor surges.
• OEM-compatible construction designed to pair with matching Square D loadcenters and panelboards, ensuring consistent performance and straightforward replacement.
• Versatile across environments from home subpanels to light commercial electrical rooms, delivering dependable protection where it matters.

How it Protects Your Circuits

The LA9D511 guards against dangerous overcurrent conditions that can damage conductors and devices. Its thermal-magnetic trip unit automatically flags abnormal heat buildup or excessive current, opening the circuit to prevent insulation damage, fire risk, and equipment failure. This design delivers stable trip characteristics even as ambient temperatures vary or loads shift throughout the day.

Ideal Applications

• Residential panelboards and subpanels protecting branch circuits from overloads
• Commercial service panels in small offices or retail spaces
• Light industrial electrical installations requiring dependable short-circuit protection

Compatibility & Installation Tips

Choose the LA9D511 for systems that require a molded case circuit breaker with a thermal-magnetic trip. It is designed to be compatible with matching OEM loadcenters and panelboards, simplifying substitution within established electrical architectures. When installing or replacing breakers, confirm that the replacement part matches the panelboard's family and circuit rating, and ensure secure mounting and proper electrical contact for reliable operation.

Technical Details

• Manufacturer: Square D
• Part Number: LA9D511
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Equip your panel with the trusted protection of Square D. The LA9D511 is ready to integrate with your existing Square D ecosystem, delivering clear, predictable protection when it matters most. Add it to your electrical hardware lineup to safeguard wiring, devices, and people with a proven, industry-standard solution.